@article{simmons_ducoste_2024, title={Fat, Oil, and Grease Sewer Waste Management System: A Modeling Platform for Simulating the Formation of FOG Deposits in Sewer Networks}, volume={150}, ISSN={["1943-7870"]}, url={https://doi.org/10.1061/JOEEDU.EEENG-7543}, DOI={10.1061/JOEEDU.EEENG-7543}, abstractNote={The accumulation of fat, oil, and grease (FOG) deposits in sanitary sewer systems is a global issue responsible for billions of dollars in annual maintenance costs, environmental impact, and public health concerns. Laboratory and data-driven studies have explored the physical and chemical characteristics of FOG deposits, formation kinetics, and factors influencing their accumulation in sewer networks, such as pipe sags, pipe age, and pipe material. However, a scalable modeling platform capable of incorporating FOG kinetics and the key variables driving accumulation is not currently available. This study introduces a new platform for modeling the formation and attachment of FOG deposits in sewer systems, the FOG Sewer Waste Management System (FOG-SWMS). FOG-SWMS was utilized to quantify the impact of pipe sags, pipe age and roughness, and pipe material on the accumulation of FOG deposits in sewer lines. Results indicate that under typical sewer conditions, pipe sags and pipe age may increase the accumulation of FOG deposit mass by as much as approximately 23% and 150%, respectively. Surface pH≥8, as a proxy for cementitious pipe materials, also resulted in more than a 172% increase in FOG deposit mass accumulation. These results confirm data from previous laboratory studies and machine learning algorithms, and also provide a mechanistic explanation of formation processes. Two full-scale sewer network case studies, Study Area 1 (SA1) and Study Area 2 (SA2), were analyzed using FOG-SWMS, to evaluate the predictive capability of the model to identify FOG deposit accumulation zones. FOG-SWMS successfully predicted approximately 85% and 73% of known accumulation zones in SA1 and SA2, respectively. Significant changes in the spatial and temporal distribution of FOG deposits in response to new commercial and residential development also were demonstrated with the model.}, number={4}, journal={JOURNAL OF ENVIRONMENTAL ENGINEERING}, author={Simmons, Nathan S. and Ducoste, Joel J.}, year={2024}, month={Apr} }
 @article{narode_hao_pourghaz_ducoste_barlaz_2024, title={Measurement and Temperature Prediction from Ash Disposed in Landfills Using a Quasi-Adiabatic Flow Reactor}, volume={5}, ISSN={["2690-0645"]}, url={https://doi.org/10.1021/acsestengg.4c00023}, DOI={10.1021/acsestengg.4c00023}, journal={ACS ES&T ENGINEERING}, author={Narode, Asmita and Hao, Zisu and Pourghaz, Moe and Ducoste, Joel J. and Barlaz, Morton A.}, year={2024}, month={May} }
 @article{smith_weaver_ducoste_iii_2024, title={Microbial community assembly in engineered bioreactors}, volume={255}, ISSN={["1879-2448"]}, url={https://doi.org/10.1016/j.watres.2024.121495}, DOI={10.1016/j.watres.2024.121495}, abstractNote={Microbial community assembly (MCA) processes that shape microbial communities in environments are being used to analyze engineered bioreactors such as activated sludge systems and anaerobic digesters. The goal of studying MCA is to be able to understand and predict the effect of design and operation procedures on bioreactor microbial composition and function. Ultimately, this can lead to bioreactors that are more efficient, resilient, or resistant to perturbations. This review summarizes the ecological theories underpinning MCA, evaluates MCA analysis methods, analyzes how these MCA-based methods are applied to engineered bioreactors, and extracts lessons from case studies. Furthermore, we suggest future directions in MCA research in engineered bioreactor systems. The review aims to provide insights and guidance to the growing number of environmental engineers who wish to design and understand bioreactors through the lens of MCA.}, journal={WATER RESEARCH}, author={Smith, Savanna K. and Weaver, Joseph E. and Ducoste, Joel J. and Iii, Francis L. de los Reyes}, year={2024}, month={May} }
 @article{ahmadi_abbasi_torabian_loosdrecht_ducoste_2023, title={Biotransformation of micropollutants in moving bed biofilm reactors under heterotrophic and autotrophic conditions}, volume={460}, ISSN={["1873-3336"]}, DOI={10.1016/j.jhazmat.2023.132232}, abstractNote={We investigated the transformation of four pharmaceuticals (Diclofenac, Naproxen, Ibuprofen and Carbamazepine) in a moving bed biofilm reactor subjected to different COD/N ratios in four experimental phases. The shift from medium to high range COD/N ratio (i.e., 5:1 to 100:1) intensified the competition between heterotrophs and nitrifying communities, leading to a transition from co-existence of heterotrophic and autotrophic conditions with high COD removal and nitrification rate in phase I to dominant heterotrophic conditions in phase II. At lower range COD/N ratios (i.e., 1:2 and 1:8) in phase III and IV, autotrophic conditions prevailed, resulting in increased nitrification rates and high abundance of amoA gene in the biofilm. Such shifts in the operating condition were accompanied by notable changes in the biofilm concentrations, composition and abundance of microbial populations as well as biodiversity in the biofilms, which collectively affected the degradation rates of the pharmaceuticals. We observed higher kinetic rates per unit of biofilm concentration under autotrophic conditions compared to heterotrophic conditions for all compounds except Naproxen, indicating the importance of nitrification in the transformation of such compounds. The results also revealed a positive relationship between biodiversity and biomass-normalized kinetic rates of most compounds.}, journal={JOURNAL OF HAZARDOUS MATERIALS}, author={Ahmadi, Navid and Abbasi, Mona and Torabian, Ali and Loosdrecht, Mark C. M. and Ducoste, Joel}, year={2023}, month={Oct} }
 @article{lai_ducoste_de los reyes iii_2023, title={Growth of Dunaliella viridis in multiple cycles of reclaimed media after repeated high pH-induced flocculation and harvesting}, volume={891}, ISSN={["1879-1026"]}, url={https://publons.com/wos-op/publon/61632805/}, DOI={10.1016/j.scitotenv.2023.164087}, abstractNote={Minimizing the use of water for growing microalgae is crucial for lowering the energy and costs of animal feed, food, and biofuel production from microalgae. Dunaliella spp., a haloterant species that can accumulate high intracellular levels of lipids, carotenoids, or glycerol can be harvested effectively using low-cost and scalable high pH-induced flocculation. However, the growth of Dunaliella spp. in reclaimed media after flocculation and the impact of recycling on the flocculation efficiency have not been explored. In this study, repeated cycles of growth of Dunaliella viridis in repeatedly reclaimed media from high pH-induced flocculation were studied by evaluating cell concentrations, cellular components, dissolved organic matter (DOM), and bacterial community shifts in the reclaimed media. In reclaimed media, D. viridis grew to the same concentrations of cells and intracellular components as fresh media-107 cells/mL with cellular composition of 3 % lipids, 40 % proteins, and 15 % carbohydrates-even though DOM accumulated and the dominant bacterial populations changed. There was a decrease in the maximum specific growth rate and flocculation efficiency from 0.72 d-1 to 0.45 d-1 and from 60 % to 48 %, respectively. This study shows the potential of repeated (at least five times) flocculation and reuse of media as a possible way of reducing the costs of water and nutrients with some tradeoffs in growth rate and flocculation efficiency.}, journal={SCIENCE OF THE TOTAL ENVIRONMENT}, author={Lai, Yi-Chun and Ducoste, Joel J. and de los Reyes III, Francis L.}, year={2023}, month={Sep} }
 @article{wang_de los reyes iii_ducoste_2023, title={Microplate-Based Cell Viability Assay as a Cost-Effective Alternative to Flow Cytometry for Microalgae Analysis}, volume={57}, ISSN={["1520-5851"]}, url={https://doi.org/10.1021/acs.est.3c05675}, DOI={10.1021/acs.est.3c05675}, abstractNote={Cell viability is a critical indicator for assessing culture quality in microalgae cultivation for biorefinery and bioremediation. Fluorescent dyes that distinguish viable from nonviable cells can enable viability quantification based on the percentage of live cells. However, fluorescence analysis using the typical flow cytometry method is costly and impractical for industrial applications. To address this, we developed new microplate assays utilizing fluorescein diacetate as a live cell stain and erythrosine B as a dead cell stain. These assays provide a low-cost, simple, and reliable method of assessing cell viability. The proposed microplate assays were successfully applied to monitor the viability of the microalgae Dunaliella viridis under carbon and nitrogen limitation stresses and demonstrated good agreement with flow cytometry measurements. We conducted a systematic investigation of the effects of dye concentration, incubation time, and background fluorescence on the microplate assays' performance. Further, we provide a comprehensive review of commonly used fluorescent dyes for microalgae staining, discuss strategies to enhance assay performance, and offer recommendations for dye selection and protocol development. This study presents a comprehensive new method for microplate-based viability analysis, providing valuable insights for future microalgae viability assessments and applications.}, number={50}, journal={ENVIRONMENTAL SCIENCE & TECHNOLOGY}, author={Wang, Diyuan and de los Reyes III, Francis L. and Ducoste, Joel J.}, year={2023}, month={Dec}, pages={21200–21211} }
 @article{hao_barlaz_ducoste_2023, title={Quasi-Mechanistic 3D Finite Element Model Predicts Temperatures in a U.S. Landfill}, volume={11}, ISSN={["2690-0645"]}, url={https://doi.org/10.1021/acsestengg.3c00289}, DOI={10.1021/acsestengg.3c00289}, abstractNote={There have been reports of North American municipal solid waste landfills exhibiting temperatures in excess of 80 °C. Although mathematical models have been developed to predict heat generation and accumulation in landfills, predictions have not been compared to temperature data from a full-scale landfill that receives heat generating ash. The objectives of this study were to apply a three-dimensional finite element model to a southeastern U.S. landfill and to compare model predictions with field data. The model incorporates gas–liquid–heat reactive transfer with exothermic biological reactions and hydration and carbonation of ash. An 8-step reconstruction approach digitalized the landfill geometry for the incorporation of a site-specific waste disposal strategy and initial and boundary conditions. The model was calibrated to adjust laboratory-measured rates of ash hydration and carbonation to the field rates. Once calibrated, the results showed a total root-mean-square error of 11 °C across 40 measurements in five temperature probes. The model predicted an elevated temperature zone in a region of the landfill between two temperature probes, and the predicted temperatures were consistent with the temperature trends in gas collection wells. The model is sensitive to the CaO content of ash, highlighting the importance of understanding the ash composition prior to disposal.}, journal={ACS ES&T ENGINEERING}, author={Hao, Zisu and Barlaz, Morton A. and Ducoste, Joel J.}, year={2023}, month={Nov} }
 @article{bernardy_elardo_trautz_malley_wang_ducoste_2022, title={Effects of UV-C Disinfection on N95 and KN95 Filtering Facepiece Respirator Reuse}, volume={9}, ISSN={["1098-5336"]}, DOI={10.1128/aem.01221-22}, abstractNote={
            Research suggests degradation of FFR materials at high UV doses is important. There appears to be a peak inactivation dose at approximately 1,500 mJ/cm
            2
            . The subsequent dose increases appear to have the reverse effect on inactivation values; these trends have shown true with both the N95 and KN95-Purism respirators.
          }, journal={APPLIED AND ENVIRONMENTAL MICROBIOLOGY}, author={Bernardy, Castine and Elardo, Nicola and Trautz, Alexa and Malley, Jim and Wang, Diyuan and Ducoste, Joel}, year={2022}, month={Sep} }
 @article{ducoste_2021, title={AEESP Endured Despite a Challenging Year}, volume={38}, ISSN={["1557-9018"]}, url={https://doi.org/10.1089/ees.2021.0269}, DOI={10.1089/ees.2021.0269}, abstractNote={Environmental Engineering ScienceVol. 38, No. 9 AEESP President's LetterAEESP Endured Despite a Challenging YearJoel J. DucosteJoel J. Ducoste*Corresponding author: Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Centennial Campus, Fitts-Woolard Hall, Room 3250, 915 Partners Way, Raleigh, NC 27695, USA. Phone: 919-515-8150; Fax: 919-515-7908; E-mail Address: jducoste@ncsu.eduhttps://orcid.org/0000-0002-3021-3942Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, North Carolina, USA.†Member of AEESP.Search for more papers by this authorPublished Online:10 Sep 2021https://doi.org/10.1089/ees.2021.0269AboutSectionsView articleView Full TextPDF/EPUB Permissions & CitationsPermissionsDownload CitationsTrack CitationsAdd to favorites Back To Publication ShareShare onFacebookTwitterLinked InRedditEmail View articleFiguresReferencesRelatedDetails Volume 38Issue 9Sep 2021 InformationCopyright 2021, Mary Ann Liebert, Inc., publishersTo cite this article:Joel J. Ducoste.AEESP Endured Despite a Challenging Year.Environmental Engineering Science.Sep 2021.819-821.http://doi.org/10.1089/ees.2021.0269Published in Volume: 38 Issue 9: September 10, 2021Online Ahead of Print:July 21, 2021PDF download}, number={9}, journal={ENVIRONMENTAL ENGINEERING SCIENCE}, publisher={Mary Ann Liebert Inc}, author={Ducoste, Joel J.}, year={2021}, month={Sep}, pages={819–821} }
 @article{ducoste_2021, title={AEESP: A Collective Force to Achieve Educational and Research Heights in Environmental Engineering and Science}, volume={38}, ISSN={1557-9018}, url={http://dx.doi.org/10.1089/ees.2020.0402}, DOI={10.1089/ees.2020.0402}, abstractNote={Environmental Engineering ScienceVol. 38, No. 1 AEESP President’s LetterFree AccessAEESP: A Collective Force to Achieve Educational and Research Heights in Environmental Engineering and ScienceJoel J. DucosteJoel J. Ducoste*Corresponding author: Department of Civil, Construction, and Environmental Engineering, NCSU Centennial Campus, 3343 Fitts-Woolard Hall, 915 Partners Way, Raleigh, NC 27606-7908, USA. Phone: 919-515-8150; Fax: 919-515-7908; E-mail Address: jducoste@ncsu.eduDepartment of Civil, Construction, and Environmental Engineering, NCSU Centennial Campus, Raleigh, North Carolina, USA.†Member of AEESP.Search for more papers by this authorPublished Online:12 Jan 2021https://doi.org/10.1089/ees.2020.0402AboutSectionsPDF/EPUB Permissions & CitationsPermissionsDownload CitationsTrack CitationsAdd to favorites Back To Publication ShareShare onFacebookTwitterLinked InRedditEmail I never imagined that I would start my presidency of AEESP when we are experiencing such tumultuous times (e.g., a global pandemic, racial strife). I was looking forward to just sharing some exciting things that AEESP will be doing for our members and some personal initiatives that I wanted to accomplish as president. But sharing these initiatives in isolation seems to pale in comparison when our members are wondering: (1) “how I will deliver my course to maintain effective student learning,” (2) “how will I conduct my research while maintaining the health and well-being of my research group,” and (3) “how are my graduate students and postdoctoral fellows feeling and dealing with everything?” AEESP and more so, the global community has never been tested more than it is today to deal with life's uncertainties. The list of worries is long and personal. I can tell you that there are days that I find it difficult to think and be motivated to work on new ideas for educational or research purposes.The one thing that helps me maintain my path forward is that I am not alone and that we are all in this together. AEESP was founded on the premise that our collective influence is more powerful than each of us alone to accomplish great initiatives in support of educating future generations of environmental engineers and scientists. There were many times that our members and leadership had to represent the membership at federal meetings to express our concern over budget cuts for training grants and extramural research. Although we are not a large association, we worked with other associations to increase our collective power to convince legislatures and those who control budget allocations that our research and educational accomplishments at our universities are vital to the global pursuit of public health and environmental health protection. Technologies that we create whether through hypothesis-driven or nonhypothesis-driven research have changed the world and made it a little safer. Former students who are now leaders in research, engineering practice, educators, and policy makers are helping shape our planet's future. Even with all the accomplishments that we can claim from our collective efforts, there are external forces that want to erode those accomplishments. In addition, there are words and actions used by others to incite division and federal policies that could derail everything we have worked hard to secure for this generation and the next.Although many of these forces are affecting life as we know it well beyond the borders within which AEESP operates, we as an association have led by example and continue to demonstrate our innovation for the benefit of our members and the communities that we serve. For example, Colleen Naughton from UC Merced, in coordination with other members, has led an initiative entitled “AEESP sense of community” that involves developing and collecting a series of online educational resources and webinars for our members to help support the transition to digital educational delivery. She helped put together a list of online resources in a spreadsheet that is available on our AEESP website to assist those faculty members in their transition to digital delivery. The list of items continues to grow as members add their resources to help others. Webinars from our faculty colleagues have already been delivered on digital learning and have led to some great advice for best practices in remote distance education. That webinar was recorded and is available on AEESP YouTube channel.A survey was also sent to our membership to get a better sense of how AEESP can be of support during this challenging time. Potential responses to the question included (1) online teaching and pedagogy, (2) inclusive teaching, research, and mentoring, (3) remote graduate student mentoring, (4) virtual research strategies, (5) faculty mentoring, and (6) other. Overwhelmingly, responses to the survey suggest that our members want information to help them with online teaching and pedagogy and inclusive, teaching, research, and mentoring (Fig. 1). One of my goals is to work with the Educational committee to help develop a series of webinars that will provide information on these topics to improve the sense of community in this digital educational and research world that has been thrust upon us.FIG. 1. Potential topics for future webinars to support our members from AEESP sense of community series.Past President Maya Trotz has received NSF funding to support a project entitled “Converging COVID-19, environment, health, and equity.” This project is designed to host a series of meetings that bring together researchers from environmental engineering and science to share knowledge, and discuss linkages across different domains of air, water, and the built environment as they relate to COVID-19 responses, and contexts of inequity within communities. These wonderful intersectional research and discussions that cut across engineering, science, and the social sciences will lead to out-of-the-box and transformational information that moves our field in bold new directions and are critically needed for healthy and resilient communities. I am so proud of our membership because these examples show what we do collectively to support the constituencies that we serve and each other.I am overwhelmingly humbled to serve as the next AEESP President. I look back at the list of presidents before me and see research and educational giants in the field of environmental engineering and science. Yet all of them took time to serve in this important role. I can say the same about many of you who have participated as chairs of committees and members of these committees. It still impresses me to see how members are encouraged to become contributors to the well-being of our association beyond just being a card-carrying member. I became a contributing member after attending one of our biennial conferences. If you have not attended one, then I highly recommend that you do, as you will witness the passion of our members who are sharing their time in service of our AEESP. I was hooked. You will have that opportunity next year at Washington University in St Louis, MO. I am grateful for the leadership of Daniel Giammar and his team to host our biennial Research and Education Conference. I know it will be great.I want to take this opportunity to thank all the past and current committee chairs and members of those committees for their contributions toward AEESP's mission. I am grateful to members who submit their names after being nominated to serve on the AEESP board of directors (BODs). I also want to thank those who have served in this capacity. More recently, I want to acknowledge my BOD colleagues Karl Linden, Shaily Mahendra, and April Gu, who are completing their terms and welcome incoming BODs: Junko Munakata Marr, Treavor Boyer, and Debora Rodrigues who are starting their terms on the BODs. I look forward to continue working with you and other members on the BOD, committee chairs, and their committees to keep AEESP supporting our members and fulfilling its mission. I also want to thank our sustaining members for supporting AEESP initiatives. I cannot thank enough those who have contributed personal funds to support AEESP Foundation endowments and those who work tirelessly to raise awareness and encourage others to help support those endowments.Therefore, as your president, I hope to work on a number of initiatives and galvanize others to support those initiatives to help make sure that our association continues to serve the mission of educating future generations of environmental leaders and to support our constituencies that provide global public and environmental health protection. Table 1 displays those initiatives.Table 1. AEESP Presidential Initiatives for 2020–2021 Academic Year1. Broaden participation of underrepresented groups in tenure track faculty, postdoctoral fellows, and graduate student in environmental engineering and science.2. Grow global participation of international members in AEESP.3. Develop initiatives to enact the NAE/NAS educational mission reported in Grand Challenges of Environmental Engineering and Science report.4. Work on the AEESP strategic plan.5. Begin work on revamping the AEESP Website.6. Finalize AEESP core values statement.NAE, National Academy of Engineering; NAS, National Academy of Science.The list is long and contains items that will go on after my presidency. AEESP presidents have a very short time to make an impact in that role. All presidents hope to do is share a vision, convince others to help fulfill that vision, and get advice on how to achieve it. My first two goals are not unique to me but were goals proposed by my predecessors and good friends Maya Trotz and Karl Linden. I believe that their goals will continue to make AEESP globally strong, diverse, and more inclusive. I will share in detail my vision in future correspondences.Finally, I want to implore all members to be patient with yourselves and each other. Expectations of producing excellence that we place on each other and ourselves are high. Yet, the times that we currently live have placed additional unexpected burdens. Please look out for one another. Reach out to a member and ask the simple questions “how are you doing,” “do you want to talk about it,” and “is there anything I can do to help?” Do not say that you understand, because the reality is that you probably do not. Be a good listener and look out for any injustices that may be occurring in your university communities.Dr. Martin Luther King, Jr. once said that “the arc of the moral universe is long, but bends towards justice.” Dr. King rephrased an earlier version of this quote from a sermon delivered by Minster Theodore Parker around 1853. This quote is powerful and tries to articulate that justice at some point will prevail when injustices occur. I do believe that the arc of a moral universe does bend toward justice, but it does not occur without a collective force. Like gravity and its interaction within the universe that can bend light, human love is the invisible force that bends this arc within a moral universe toward justice. Humans must collectively be willing to bring justice, equity, inclusion, and a sense of community to regions that do not have it, just as gravity can bend light to regions void of its radiant energy.I look forward to serving you as your president and hope that you will help me make sure that AEESP continues to serve each other and the communities that we serve.Joel Ducoste, PhDAEESP PresidentFiguresReferencesRelatedDetails Volume 38Issue 1Jan 2021 InformationCopyright 2021, Mary Ann Liebert, Inc., publishersTo cite this article:Joel J. Ducoste.AEESP: A Collective Force to Achieve Educational and Research Heights in Environmental Engineering and Science.Environmental Engineering Science.Jan 2021.1-3.http://doi.org/10.1089/ees.2020.0402Published in Volume: 38 Issue 1: January 12, 2021Online Ahead of Print:October 22, 2020PDF download}, number={1}, journal={Environmental Engineering Science}, publisher={Mary Ann Liebert Inc}, author={Ducoste, Joel J.}, year={2021}, month={Jan}, pages={1–3} }
 @misc{wang_lai_karam_de los reyes_ducoste_2021, title={Algae Dynamic and functional modeling of carbon metabolism in photosynthetic microalgae}, author={Wang, D. and Lai, Y. and Karam, A.L. and de los Reyes, F.L., III and Ducoste, J.J.}, year={2021}, month={Jun} }
 @article{bouteh_ahmadi_abbasi_torabian_loosdrecht_ducoste_2021, title={Biodegradation of organophosphorus pesticides in moving bed biofilm reactors: Analysis of microbial community and biodegradation pathways}, volume={408}, ISSN={["1873-3336"]}, DOI={10.1016/j.jhazmat.2020.124950}, abstractNote={We investigated the performance of a lab-scale moving bed biofilm reactor (MBBR) with respect to general bioconversion processes and biotransformation of two commonly used organophosphorus pesticides, Chlorpyrifos (CHL) and Malathion (MAL). The reactor was operated for 300 days under different organic loads by changing hydraulic retention time (HRT). The decrease in organic load resulted in the formation of a thinner biofilm and the growth of more biomass in the bulk, which greatly shifted bioconversion processes. The low organic loading supported more nitrification in the reactor, but an opposite trend was observed for denitrification, which was enhanced at higher organic loading where the formation of anoxic zones in the thick biofilm was favored. 70% and 55% removal corresponding to 210 and 165 µg/m2/d occurred for MAL and CHL, respectively, at an HRT of 3 h and progressively increased with higher HRTs. Phylogenetic analysis revealed a shift in composition and abundance of taxa throughout the reactor operation where lower loading rate supported the growth of a more diverse and evenly distributed community. The analysis also highlighted the dominance of heterotrophic communities such as Flavobacterium and Acinetobacter johnsonii, which could be involved in the biotransformation of CHL and MAL through co-metabolism.}, journal={JOURNAL OF HAZARDOUS MATERIALS}, author={Bouteh, Ehsan and Ahmadi, Navid and Abbasi, Mona and Torabian, Ali and Loosdrecht, Mark C. M. and Ducoste, Joel}, year={2021}, month={Apr} }
 @article{karam_lai_reyes_ducoste_2021, title={Chlorophyll a and non-pigmented biomass are sufficient predictors for estimating light attenuation during cultivation of Dunaliella viridis}, volume={55}, ISSN={["2211-9264"]}, url={https://publons.com/wos-op/publon/46639302/}, DOI={10.1016/j.algal.2021.102283}, abstractNote={Characterizing light in microalgal cultivation vessels is needed for modeling and optimizing microalgal growth for large-scale cultivation. Dynamic changes in light intensity over space due to geometry, refraction/reflection, and the interactive impacts of algal growth and their biocomponents with light make this characterization challenging. Understanding which biocomponents within microalgal cultures are key variables in accurately estimating light attenuation is fundamentally important, yet, inconsistent and wide-ranging applications of the Beer-Lambert law are often used to estimate light attenuation. This research rigorously evaluated which biocomponents (total biomass, cell count, and chl a, chl b, and total photosynthesizing pigments), or biocomponent combinations, serve as best predictors for light attenuation when modeling with the Beer-Lambert law. Calibration and validation experiments were performed using salt-water species Dunaliella viridis microalgal cultures grown in 3-L flat-plate PBRs with continuous light monitoring. Results at the various light and nitrogen levels tested showed Beer-Lambert's law predicted photosynthetic light attenuation well when both biomass and chlorophyll a were considered as distinct attenuating components, providing light estimates with less than 6% error on average over validation experiments. If the model included only one component as a predictor for attenuation, pigments were best, with a 20% error in estimating light, as compared to ~70%, 60%, 40% for models that used solely biomass, cells, or chlorophyll a as an attenuating component., respectively. These results suggest that when using the Beer-Lambert's law to estimate photosynthetic light attenuation in microalgal cultures, both a chlorophyll a and biomass component should be consistently included.}, journal={ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS}, author={Karam, Amanda L. and Lai, Yi-Chun and Reyes, Francis L. I. I. I. I. I. I. and Ducoste, Joel J.}, year={2021}, month={May} }
 @article{zapata rivera_ducoste_ricardo pena_portapila_2021, title={Computational Fluid Dynamics Simulation of Suspended Solids Transport in a Secondary Facultative Lagoon Used for Wastewater Treatment}, volume={13}, ISSN={["2073-4441"]}, url={https://www.mdpi.com/2073-4441/13/17/2356}, DOI={10.3390/w13172356}, abstractNote={The facultative lagoon hydrodynamics has been evaluated using computational fluid dynamics tools, however, little progress has been made in describing the transport of suspended solids within these systems, and their effects on fluid hydrodynamics. Traditionally, CFD models have been built using pure water. In this sense, the novelty in this study was to evaluate the influence of suspended solids transport on the hydrodynamics of an facultative lagoon. Two three-dimensional CFD models were developed, a single-phase model (pure water) and a two-phase model (water and suspended solids), for a conventional FL in Ginebra, Valle del Cauca, Colombia. Model results were compared with experimental tracer studies, displaying different tracer dispersion characteristics. Differences in the fluid velocity field were identified when suspended solids were added to the simulation. The fluid velocities in the single-phase model were greater than the fluid velocities obtained in the two-phase model, (0.127 m·s−1 and 0.115 m·s−1, respectively). Additionally, the dispersion number of each model showed that the single-phase model (0.478) exhibited a better behavior of complete mixing reactor than the two-phase model (0.403). These results can be attributed to the effect of the drag and slip forces of the solids on the velocity of the fluid. In conclusion, the fluid of FL in these models is better represented as a two-phase fluid in which the particle–fluid interactions are represented by drag and slip forces.}, number={17}, journal={WATER}, author={Zapata Rivera, Andres Mauricio and Ducoste, Joel and Ricardo Pena, Miguel and Portapila, Margarita}, year={2021}, month={Sep} }
 @misc{ducoste_2021, title={Ding Ding Ding, Fatberg right ahead!: The challenges of sewer collection system sustainability and dealing with fats, oils, and grease discharge}, author={Ducoste, J.J.}, year={2021}, month={Mar} }
 @misc{kusum_pour-ghaz_ducoste_2021, title={Factors that Influence the Formation and Surface Adhesion of Fat, Oil, and Grease (FOG) Deposits}, author={Kusum, Samrin A. and Pour-Ghaz, Mohammad and Ducoste, Joel}, year={2021}, month={Mar} }
 @article{narode_pour-ghaz_ducoste_barlaz_2021, title={Measurement of heat release during hydration and carbonation of ash disposed in landfills using an isothermal calorimeter}, volume={124}, ISSN={0956-053X}, url={http://dx.doi.org/10.1016/j.wasman.2021.02.030}, DOI={10.1016/j.wasman.2021.02.030}, abstractNote={Temperatures as high as 100 °C have been reported at a few municipal solid waste (MSW) landfills in the U.S. A recently published model describing landfill heat accumulation identified reactions that contribute significant heat to landfills including the hydration and carbonation of Ca-containing wastes such as ash from MSW and coal combustion. The objective of this study was to develop a method to measure heat release from Ca-containing ash by isothermal calorimetry. The method was confirmed by comparing measured heat release from hydration and carbonation of pure CaO and Ca(OH)2 to the theoretical heat. Theoretical heat release was determined by characterizing test materials before and after experiments using thermogravimetric analysis (TGA) and X-ray diffraction (XRD). Heat recovery efficiencies with both water and synthetic leachate ranged from 79 to 90% for CaO hydration and between 65 and 74% for Ca(OH)2 carbonation, with no effect attributable to leachate. Additionally, simultaneous hydration and carbonation of CaO/Ca(OH)2 mixtures resulted in efficiencies of 65 to 74%. The developed method was applied to eight samples that were excavated from a landfill and known to contain coal ash, and the ratio of measured to theoretical heat was 0.5 to 4. Thus, calculation of theoretical heat release from XRD data was not a good predictor of the experimentally measured heat release. The developed method can be used by landfill operators to evaluate the heat potential of a waste, thereby facilitating decisions on the quantity of a waste that can be buried in consideration of landfill temperatures.}, journal={Waste Management}, publisher={Elsevier BV}, author={Narode, Asmita and Pour-Ghaz, M. and Ducoste, Joel J. and Barlaz, Morton A.}, year={2021}, month={Apr}, pages={348–355} }
 @misc{weaver_de los reyes_ducoste_2021, title={Modeling environmental bioreactors treating wastewater by integrating biological processes, floc microenvironments, and computational fluid dynamics}, author={Weaver, J. and de los Reyes, F. and Ducoste, J.J.}, year={2021}, month={Jun} }
 @article{ducoste_2021, title={The Healing and Joyful Power of the Service to Others}, volume={38}, ISSN={1557-9018}, url={http://dx.doi.org/10.1089/ees.2021.0008}, DOI={10.1089/ees.2021.0008}, abstractNote={Environmental Engineering ScienceVol. 38, No. 4 ArticlesThe Healing and Joyful Power of the Service to OthersJoel J. DucosteJoel J. Ducoste*Corresponding author: Department of Civil, Construction, and Environmental Engineering, Centennial Campus, Fitts-Woolard Hall, Room 3250, 915 Partners Way, Raleigh, NC 27695, USA. Phone: 919-515-8150; Fax: 919-515-7908; E-mail Address: jducoste@ncsu.eduDepartment of Civil, Construction, Environmental Engineering, College of Engineering, North Carolina State University, Raleigh, North Carolina, USA.†Member of AEESP.Search for more papers by this authorPublished Online:21 Apr 2021https://doi.org/10.1089/ees.2021.0008AboutSectionsView articleView Full TextPDF/EPUB Permissions & CitationsPermissionsDownload CitationsTrack CitationsAdd to favorites Back To Publication ShareShare onFacebookTwitterLinked InRedditEmail View article"The Healing and Joyful Power of the Service to Others." Environmental Engineering Science, 38(4), pp. 209–210FiguresReferencesRelatedDetailsCited byAEESP Endured Despite a Challenging Year Joel J. Ducoste10 September 2021 | Environmental Engineering Science, Vol. 38, No. 9 Volume 38Issue 4Apr 2021 InformationCopyright 2021, Mary Ann Liebert, Inc., publishersTo cite this article:Joel J. Ducoste.The Healing and Joyful Power of the Service to Others.Environmental Engineering Science.Apr 2021.209-210.http://doi.org/10.1089/ees.2021.0008Published in Volume: 38 Issue 4: April 21, 2021Online Ahead of Print:February 10, 2021PDF download}, number={4}, journal={Environmental Engineering Science}, publisher={Mary Ann Liebert Inc}, author={Ducoste, Joel J.}, year={2021}, month={Apr}, pages={209–210} }
 @article{wu_wan_yu_zhang_ducoste_2021, title={The effect of activated sludge floc morphology on the measurement of biomass half-saturation coefficient: A 2D CFD biofilm model-based evaluation and experimental verification}, volume={168}, ISSN={1369-703X}, url={http://dx.doi.org/10.1016/j.bej.2021.107931}, DOI={10.1016/j.bej.2021.107931}, abstractNote={The measured substrate half-saturation coefficient (KS) in Monod growth rate equation is an important parameter to calculate the specific biomass growth rate. The measured KS could be affected by both the intrinsic biomass and the external substrate transport resistance resulting in its value being called an apparent KS. Although past research recognized the effect of activate sludge (AS) floc size on the measured apparent KS due to substrate diffusional resistance, it is not clear how the floc shape affects the apparent KS. In this study, the effect of AS floc morphology in terms of both floc size and shape was examined on the measurement of apparent KS. The AS floc/granule of different morphologies (i.e., circularity and size) were generated from a 2-Dimensional computational fluid dynamics (CFD) biofilm model. Results indicate that the apparent KS was significantly larger than its intrinsic value 22 and 98 times higher for the 450 μm floc and granule, respectively, and decreased with decreasing floc size and circularity. Experimental measurement of ammonium and oxygen half-saturation coefficient of ammonium oxidizing bacteria supported the model results. This research demonstrates the importance of quantifying the AS floc shape in addition to floc size when determining the apparent KS.}, journal={Biochemical Engineering Journal}, publisher={Elsevier BV}, author={Wu, Jun and Wan, Jiaming and Yu, Lianze and Zhang, Miao and Ducoste, Joel J.}, year={2021}, month={Apr}, pages={107931} }
 @misc{ducoste_2021, title={Understanding the Generation of Elevated Temperature Landfills through Finite Element Modeling}, author={Ducoste, J.J.}, year={2021}, month={Apr} }
 @article{eslamiamirabadi_burton_de los reyes_ducoste_2020, title={Assessment of alternative herbicides for residential sewer root treatment and their effects on downstream treatment plant nitrification}, volume={258}, ISSN={0301-4797}, url={http://dx.doi.org/10.1016/j.jenvman.2019.110058}, DOI={10.1016/j.jenvman.2019.110058}, abstractNote={The conveyance of wastewater in sewer pipes can be severely limited by the growth of plant roots, which can be controlled with herbicides. However, adding herbicides in sewer lines may affect downstream biological wastewater treatment processes. The effects of three herbicides (Dithiopyr, Penoxsulam, and Triclopyr) on the mortality of cottonwood tree roots and on downstream biological nitrification were determined. The results showed that Triclopyr achieved the highest root mortality (96%) followed by Penoxsulam (77%) and Dithiopyr (75%). At concentrations used at the point of application in sewer pipes, all herbicides caused nitrification inhibition and reduction in organic carbon removal in activated sludge. However, no inhibition was observed at the more diluted concentrations approximately equal to levels that may reach the wastewater treatment facility. Overall, Triclopyr appears to be the best performing herbicide with the highest root kill.}, journal={Journal of Environmental Management}, publisher={Elsevier BV}, author={Eslamiamirabadi, M. and Burton, J.D. and de los Reyes, F.L., III and Ducoste, J.J.}, year={2020}, month={Mar}, pages={110058} }
 @misc{ducoste_2020, title={Changing the Tide of Post Tenure Review}, author={Ducoste, J.J.}, year={2020}, month={Jun} }
 @inproceedings{ducoste_2020, title={Clearing the Haze from Grease Interceptor Design}, author={Ducoste, J.J.}, year={2020}, month={Aug} }
 @inproceedings{narode_pour-ghaz_ducoste_barlaz_2020, title={Development of methods to measure heat released from ash hydration and carbonation in landfills}, author={Narode, A. and Pour-Ghaz, M. and Ducoste, J. and Barlaz, M.}, year={2020}, month={Feb} }
 @inproceedings{lai_ducoste_de los reyes_2020, title={Does the inoculum source improve anaerobic digestion of marine microalgae Dunaliella viridis?}, author={Lai, Y.-C. and Ducoste, J.J. and de los Reyes, F.L.}, year={2020}, month={Jun} }
 @inproceedings{wang_lai_karam_de los reyes_ducoste_2020, title={Dynamic and functional modeling of carbon metabolism in photosynthetic microalgae}, author={Wang, D. and Lai, Y.C. and Karam, A. and de los Reyes, F.L., III and Ducoste, J.J.}, year={2020} }
 @inproceedings{kusum_pour-ghaz_ducoste_2020, title={Evaluation of Fly Ash as a cement replacement to reduce sewer collection system infrastructure maintenance and enhance sustainability}, author={Kusum, S. and Pour-Ghaz, M. and Ducoste, J.}, year={2020}, month={Mar} }
 @inproceedings{hao_ducoste_barlaz_2020, title={Experimental Measurement of Heat Production from Al Corrosion under Landfill-Relevant Conditions}, author={Hao, Z. and Ducoste, J. and Barlaz, M.}, year={2020}, month={Feb} }
 @misc{ducoste_2020, title={Explaining the Formation of Elevated Temperatures in Municipal Solid Waste Landfills}, author={Ducoste, J.J.}, year={2020}, month={Feb} }
 @article{hao_barlaz_ducoste_2020, title={Finite-Element Modeling of Landfills to Estimate Heat Generation, Transport, and Accumulation}, volume={146}, ISSN={1090-0241 1943-5606}, url={http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0002403}, DOI={10.1061/(ASCE)GT.1943-5606.0002403}, abstractNote={AbstractIn North America, temperatures nearing 100°C have been reported in several municipal solid waste landfills. However, the temporal and spatial-dependent processes that result in excessive he...}, number={12}, journal={Journal of Geotechnical and Geoenvironmental Engineering}, publisher={American Society of Civil Engineers (ASCE)}, author={Hao, Zisu and Barlaz, Morton A. and Ducoste, Joel J.}, year={2020}, month={Dec}, pages={04020134} }
 @misc{ducoste_2020, title={Improving Diversity in Environmental Engineering and Science}, author={Ducoste, J.J}, year={2020}, month={Aug} }
 @article{wang_hossen_aziz_ducoste_de los reyes_2020, title={Increased loading stress leads to convergence of microbial communities and high methane yields in adapted anaerobic co-digesters}, volume={169}, ISSN={0043-1354}, url={http://dx.doi.org/10.1016/j.watres.2019.115155}, DOI={10.1016/j.watres.2019.115155}, abstractNote={Enhancing biogas production, while avoiding inhibition of methanogenesis during co-digestion of grease interceptor waste (GIW), can help water resource recovery facilities reduce their carbon footprint. Here we used pre-adapted and non-adapted digesters to link microbial community structure to digester function. Before disturbance, the pre-adapted and non-adapted digesters showed similar methane production and microbial community diversity but dissimilar community composition. When exposed to an identical disturbance, the pre-adapted digester achieved better performance, while the non-adapted digester was inhibited. When re-exposed to disturbance after recovery, communities and performance of both digesters converged, regardless of the temporal variations. Co-digestion of up to 75% GIW added on a volatile solids (VS) basis was achieved, increasing methane yield by 336% from 0.180 to 0.785 l-methane/g-VS-added, the highest methane yield reported to date for lipid-rich waste. Progressive perturbation substantially enriched fatty acid-degrading Syntrophomonas from less than 1% to 24.6% of total 16S rRNA gene sequences, acetoclastic Methanosaeta from 2.3% to 11.9%, and hydrogenotrophic Methanospirillum from less than 1% to 6.6% in the pre-adapted digester. Specific hydrolytic and fermentative populations also increased. These ecological insights demonstrated how progressive perturbation can be strategically used to influence methanogenic microbiomes and improve co-digestion of GIW.}, journal={Water Research}, publisher={Elsevier BV}, author={Wang, Ling and Hossen, Elvin H. and Aziz, Tarek N. and Ducoste, Joel J. and de los Reyes, Francis L., III}, year={2020}, month={Feb}, pages={115155} }
 @article{wu_reyes_ducoste_2020, title={Modeling cell aggregate morphology during aerobic granulation in activated sludge processes reveals the combined effect of substrate and shear}, volume={170}, url={https://doi.org/10.1016/j.watres.2019.115384}, DOI={10.1016/j.watres.2019.115384}, abstractNote={Past research on AGS (aerobic granular sludge technology) has mainly focused on macro-environment factors, such as settling time, feeding pattern, OLR (organic loading rate), SRT (sludge retention time), among others, and their effects on the granulation process. The biomass granulation process, however, is significantly affected by the micro-environment surrounding these biomass aggregates. In this research, an in silico computational approach was adopted to study the impact of the micro-environment on the biomass granulation process. A 2-D biofilm model based on the cellular automata algorithm and computational fluid dynamics was used to simulate the development of an individual biomass aggregate under specific hydrodynamic and substrate availability conditions. The simulation results indicated that shear and bulk substrate concentration combined to create the optimal conditions for aerobic granule formation. This process can be characterized by the RT (reversed Thiele) modulus value, which is the ratio of the maximum substrate transport over the maximum substrate reaction rate and an indicator of substrate availability. For AGS formation, the RT value should be greater than 0.1. Many common strategies, such as the application of batch reactors, selection for slow-growing microorganism, F/M (food/mass) ratio adjustment, feast and famine condition, and short settling time, for biomass granulation production can be explained by the RT value. The results suggest that rethinking unit process configurations in wastewater treatment facilities will be required to achieve reliable AGS formation.}, number={115384}, journal={Water Research}, publisher={Elsevier BV}, author={Wu, Jun and Reyes, III and Ducoste, Joel J.}, year={2020}, month={Mar}, pages={115384} }
 @article{kusum_pour-ghaz_ducoste_2020, title={Reducing fat, oil, and grease (FOG) deposits formation and adhesion on sewer collection system structures through the use of fly ash replaced cement-based materials}, volume={186}, ISSN={0043-1354}, url={http://dx.doi.org/10.1016/j.watres.2020.116304}, DOI={10.1016/j.watres.2020.116304}, abstractNote={The accumulation of fat, oil, and grease (FOG) deposits in sewer pipes reduces their conveyance and results in Sanitary Sewer Overflows (SSOs). Previous research has shown that concrete used in sewer lines is a significant source for calcium ion, which participates in the FOG deposit formation mechanism. However, no research has been conducted to understand the effect of calcium leaching from cement on FOG deposits formation and adhesion. This study quantifies the reduction in FOG deposit formation when Fly Ash (FA), a Supplementary Cementitious Material (SCM), is used to replace cement in the production of High Volume Fly Ash (HVFA) concrete materials. Results show that after 90 days of leaching test under controlled pH conditions, 75% and 86% reduction in calcium release were achieved from 50% and 75% FA replacement, respectively. After 30 days of FOG deposits formation tests on HVFA samples, 58% and 81% reduction in FOG deposit formation was found for 50% and 75% FA replacement, respectively. FTIR analyses of FOG deposits formed on concrete samples without FA replacement exhibited high calcium soap content (48%), while, FOG deposit formed on HVFA concrete materials showed low calcium soap percentage (22~29%). Furthermore, FTIR analyses report the first spatial variation found in FOG deposits that includes a surface layer of hard FOG deposits with high calcium soap absorbance and an outer layer of soft FOG deposits consisting of a low calcium absorbance. FTIR analyses revealed that the FOG deposit formation mechanism is affected by the availability of calcium and pH near the concrete surface. Finally, HVFA concrete materials were tested for compressive strength and durability against microbially induced concrete corrosion (MICC). After 180 days of sealed curing, HVFA concrete exhibited adequate compressive strength necessary for the sewer line construction and 50% FA replacement revealed satisfactory durability against MICC.}, journal={Water Research}, publisher={Elsevier BV}, author={Kusum, Samrin A. and Pour-Ghaz, Mohammad and Ducoste, Joel J.}, year={2020}, month={Nov}, pages={116304} }
 @misc{ducoste_2020, title={Successfully Obtaining Tenure and Promotion at an R1 University}, author={Ducoste, J.J.}, year={2020}, month={May} }
 @misc{ducoste_2019, title={Designing Efficient Grease Abatement Systems}, author={Ducoste, J.J.}, year={2019}, month={Mar} }
 @article{wang_lai_karam_de los reyes_ducoste_2019, title={Dynamic Modeling of Microalgae Growth and Lipid Production under Transient Light and Nitrogen Conditions}, volume={53}, ISSN={0013-936X 1520-5851}, url={http://dx.doi.org/10.1021/acs.est.9b02908}, DOI={10.1021/acs.est.9b02908}, abstractNote={We developed a new dynamic model to characterize how light and nitrogen regulate the cellular processes of photosynthetic microalgae leading to transient changes in the production of neutral lipids, carbohydrates, and biomass. Our model recapitulated the versatile neutral lipid synthesis pathways via (i) carbon reuse from carbohydrate metabolism under nitrogen sufficiency and (ii) fixed carbon redirection under nitrogen depletion. We also characterized the effects of light adaptation, light inhibition hysteresis, and nitrogen limitation on photosynthetic carbon fixation. The formulated model was calibrated and validated with experimental data of Dunaliella viridis cultivated in a lab-scale photobioreactor (PBR) under various light (low/moderate/high) and nitrogen (sufficient/limited) conditions. We conducted the identifiability, uncertainty, and sensitivity analyses to verify the model reliability using the profile likelihood method, the Markov chain Monte Carlo (MCMC) technique, and the extended Fourier Amplitude Sensitivity Test (eFAST). Our model predictions agreed well with experimental observations and suggested potential model improvement by incorporating a lipid degradation mechanism. The insights from our model-driven analysis helped improve the mechanistic understanding of transient algae growth and bioproducts formation under environmental variations and could be applied to optimize biofuel and biomass production.}, number={19}, journal={Environmental Science & Technology}, publisher={American Chemical Society (ACS)}, author={Wang, Diyuan and Lai, Yi-Chun and Karam, Amanda L. and de los Reyes, Francis L., III and Ducoste, Joel J.}, year={2019}, month={Aug}, pages={11560–11568} }
 @article{koryachko_matthiadis_haque_muhammad_ducoste_tuck_long_williams_2019, title={Dynamic modelling of the iron deficiency modulated transcriptome response in Arabidopsis thaliana roots}, volume={1}, ISSN={2517-5025}, url={http://dx.doi.org/10.1093/insilicoplants/diz005}, DOI={10.1093/insilicoplants/diz005}, abstractNote={The iron deficiency response in plants is a complex biological process with a host of influencing factors. The ability to precisely modulate this process at the transcriptome level would enable genetic manipulations allowing plants to survive in nutritionally poor soils and accumulate increased iron content in edible tissues. Despite the collected experimental data describing different aspects of the iron deficiency response in plants, no attempts have been made towards aggregating this information into a descriptive and predictive model of gene expression changes over time. We formulated and trained a dynamic model of the iron deficiency induced transcriptional response in Arabidopsis thaliana. Gene activity dynamics were modelled with a set of ordinary differential equations that contain biologically tractable parameters. The trained model was able to capture and account for a significant difference in mRNA decay rates under iron sufficient and iron deficient conditions, approximate the expression behaviour of currently unknown gene regulators, unveil potential synergistic effects between the modulating transcription factors and predict the effect of double regulator mutants. The presented modelling approach illustrates a framework for experimental design, data analysis and information aggregation in an effort to gain a deeper understanding of various aspects of a biological process of interest.}, number={1}, journal={in silico Plants}, publisher={Oxford University Press (OUP)}, author={Koryachko, Alexandr and Matthiadis, Anna and Haque, Samiul and Muhammad, Durreshahwar and Ducoste, Joel J and Tuck, James M and Long, Terri A and Williams, Cranos M}, year={2019}, month={Jan} }
 @misc{karam_de los reyes_ducoste_2019, title={Evaluation of alternative light models for estimating light attenuation during microalgal cultivation}, author={Karam, A. and de los Reyes, F., III and Ducoste, J.}, year={2019}, month={May} }
 @article{wang_matthews_naik_williams_ducoste_sederoff_chiang_2019, title={Flux modeling for monolignol biosynthesis}, volume={56}, ISSN={0958-1669}, url={http://dx.doi.org/10.1016/J.COPBIO.2018.12.003}, DOI={10.1016/j.copbio.2018.12.003}, abstractNote={The pathway of monolignol biosynthesis involves many components interacting in a metabolic grid to regulate the supply and ratios of monolignols for lignification. The complexity of the pathway challenges any intuitive prediction of the output without mathematical modeling. Several models have been presented to quantify the metabolic flux for monolignol biosynthesis and the regulation of lignin content, composition, and structure in plant cell walls. Constraint-based models using data from transgenic plants were formulated to describe steady-state flux distribution in the pathway. Kinetic-based models using enzyme reaction and inhibition constants were developed to predict flux dynamics for monolignol biosynthesis in wood-forming cells. This review summarizes the recent progress in flux modeling and its application to lignin engineering for improved plant development and utilization.}, journal={Current Opinion in Biotechnology}, publisher={Elsevier BV}, author={Wang, Jack P and Matthews, Megan L and Naik, Punith P and Williams, Cranos M and Ducoste, Joel J and Sederoff, Ronald R and Chiang, Vincent L}, year={2019}, month={Apr}, pages={187–192} }
 @misc{ducoste_2019, title={Full of Gold (FOG): Identifying value added initiatives for Fats, oil, and Grease waste streams}, author={Ducoste, J.J.}, year={2019}, month={Aug} }
 @article{monroe_ducoste_berglund_2019, title={Genetic Algorithm–Genetic Programming Approach to Identify Hierarchical Models for Ultraviolet Disinfection Reactors}, volume={145}, ISSN={0733-9372 1943-7870}, url={http://dx.doi.org/10.1061/(ASCE)EE.1943-7870.0001492}, DOI={10.1061/(ASCE)EE.1943-7870.0001492}, abstractNote={AbstractThe performance of ultraviolet (UV) disinfection reactors using experimental data poses major challenges to the water treatment industry, and a regression model has been developed in the wa...}, number={2}, journal={Journal of Environmental Engineering}, publisher={American Society of Civil Engineers (ASCE)}, author={Monroe, Jacob G. and Ducoste, Joel and Berglund, Emily Z.}, year={2019}, month={Feb}, pages={04018139} }
 @inproceedings{gallimore_mabry_ducoste_2019, title={It’s Time to Disrupt this Industry}, author={Gallimore, E. and Mabry, N. and Ducoste, J.}, year={2019} }
 @article{weaver_williams_ducoste_de los reyes_2019, title={Measuring the Shape and Size of Activated Sludge Particles Immobilized in Agar with an Open Source Software Pipeline}, volume={2019}, ISSN={1940-087X}, url={http://dx.doi.org/10.3791/58963}, DOI={10.3791/58963}, abstractNote={Experimental bioreactors, such as those treating wastewater, contain particles whose size and shape are important parameters. For example, the size and shape of activated sludge flocs can indicate the conditions at the microscale, and also directly affect how well the sludge settles in a clarifier. Particle size and shape are both misleadingly 'simple' measurements. Many subtle issues, often unaddressed in informal protocols, can arise when sampling, imaging, and analyzing particles. Sampling methods may be biased or not provide enough statistical power. The samples themselves may be poorly preserved or undergo alteration during immobilization. Images may not be of sufficient quality; overlapping particles, depth of field, magnification level, and various noise can all produce poor results. Poorly specified analysis can introduce bias, such as that produced by manual image thresholding and segmentation. Affordability and throughput are desirable alongside reproducibility. An affordable, high throughput method can enable more frequent particle measurement, producing many images containing thousands of particles. A method that uses inexpensive reagents, a common dissecting microscope, and freely-available open source analysis software allows repeatable, accessible, reproducible, and partially-automated experimental results. Further, the product of such a method can be well-formatted, well-defined, and easily understood by data analysis software, easing both within-lab analyses and data sharing between labs. We present a protocol that details the steps needed to produce such a product, including: sampling, sample preparation and immobilization in agar, digital image acquisition, digital image analysis, and examples of experiment-specific figure generation from the analysis results. We have also included an open-source data analysis pipeline to support this protocol.}, number={143}, journal={Journal of Visualized Experiments}, publisher={MyJove Corporation}, author={Weaver, Joseph E. and Williams, Jon C. and Ducoste, Joel J. and de los Reyes, Francis L., III}, year={2019}, month={Jan} }
 @article{lai_karam_sederoff_ducoste_de los reyes_2019, title={Relating nitrogen concentration and light intensity to the growth and lipid accumulation of Dunaliella viridis in a photobioreactor}, volume={31}, ISSN={0921-8971 1573-5176}, url={http://dx.doi.org/10.1007/s10811-019-01897-4}, DOI={10.1007/s10811-019-01897-4}, number={6}, journal={Journal of Applied Phycology}, publisher={Springer Science and Business Media LLC}, author={Lai, Yi-Chun and Karam, Amanda L. and Sederoff, Heike W. and Ducoste, Joel J. and de los Reyes, Francis L.}, year={2019}, month={Aug}, pages={3397–3409} }
 @misc{ducoste_2019, title={Tips on Successfully Navigating Graduate School}, author={Ducoste, J.J.}, year={2019}, month={Oct} }
 @misc{hao_ducoste_barlaz_2018, title={A Spatial Variation Model Describing Generation, Accumulation, and Propagation of Heat in Municipal Solid}, author={Hao, Z. and Ducoste, J. and Barlaz, M.}, year={2018}, month={Feb} }
 @misc{ducoste_2018, title={A life’s Journey in Being a Transformative Agent of Change}, author={Ducoste, J.J.}, year={2018}, month={Nov} }
 @inproceedings{kusum_pour-ghaz_ducoste_2018, title={Alternative Binder Materials and its Application in Concrete Sewer Structures for Possible Reduction in Fat, Oil and Grease (FOG) Related Sanitary Sewer Overflows (SSOs)}, author={Kusum, S. and Pour-Ghaz, M. and Ducoste, J.}, year={2018} }
 @article{blaney_perlinger_bartelt-hunt_kandiah_ducoste_2018, title={Another Grand Challenge: Diversity in Environmental Engineering}, volume={35}, ISSN={1557-9018}, url={http://dx.doi.org/10.1089/ees.2017.0337}, DOI={10.1089/ees.2017.0337}, abstractNote={As efforts to address grand challenges in engineering move forward, one important challenge has been conspicuously absent—improving diversity in science, technology, engineering, and math fields. Previous research has shown that diverse teams perform better in a range of output measures and are better equipped to objectively and creatively evaluate problems. Here, we make the case for including diversity as a critical component of our ability to enable transformative solutions to the grand challenges in environmental engineering.}, number={6}, journal={Environmental Engineering Science}, publisher={Mary Ann Liebert Inc}, author={Blaney, Lee and Perlinger, Judith A. and Bartelt-Hunt, Shannon L. and Kandiah, Ramanitharan and Ducoste, Joel J.}, year={2018}, month={Jun}, pages={568–572} }
 @misc{ducoste_2018, title={Assessing Surface Characteristics to reduce the adhesion of Fats, Oils, and Grease Deposits}, author={Ducoste, J.J.}, year={2018}, month={Oct} }
 @article{naik_wang_sederoff_chiang_williams_ducoste_2018, title={Assessing the impact of the 4CL enzyme complex on the robustness of monolignol biosynthesis using metabolic pathway analysis}, volume={13}, ISSN={1932-6203}, url={http://dx.doi.org/10.1371/journal.pone.0193896}, DOI={10.1371/journal.pone.0193896}, abstractNote={Lignin is a polymer present in the secondary cell walls of all vascular plants. It is a known barrier to pulping and the extraction of high-energy sugars from cellulosic biomass. The challenge faced with predicting outcomes of transgenic plants with reduced lignin is due in part to the presence of unique protein-protein interactions that influence the regulation and metabolic flux in the pathway. Yet, it is unclear why certain plants have evolved to create these protein complexes. In this study, we use mathematical models to investigate the role that the protein complex, formed specifically between Ptr4CL3 and Ptr4CL5 enzymes, have on the monolignol biosynthesis pathway. The role of this Ptr4CL3-Ptr4CL5 enzyme complex on the steady state flux distribution was quantified by performing Monte Carlo simulations. The effect of this complex on the robustness and the homeostatic properties of the pathway were identified by performing sensitivity and stability analyses, respectively. Results from these robustness and stability analyses suggest that the monolignol biosynthetic pathway is resilient to mild perturbations in the presence of the Ptr4CL3-Ptr4CL5 complex. Specifically, the presence of Ptr4CL3-Ptr4CL5 complex increased the stability of the pathway by 22%. The robustness in the pathway is maintained due to the presence of multiple enzyme isoforms as well as the presence of alternative pathways resulting from the presence of the Ptr4CL3-Ptr4CL5 complex.}, number={3}, journal={PLOS ONE}, publisher={Public Library of Science (PLoS)}, author={Naik, Punith and Wang, Jack P. and Sederoff, Ronald and Chiang, Vincent and Williams, Cranos and Ducoste, Joel J.}, editor={Cullen, DanielEditor}, year={2018}, month={Mar}, pages={e0193896} }
 @misc{ducoste_2018, title={Building your Academic Brand}, author={Ducoste, J.J.}, year={2018}, month={Mar} }
 @article{weaver_hong_ducoste_de los reyes_2018, title={Controlling aerobic biological floc size using Couette-Taylor Bioreactors}, volume={147}, ISSN={0043-1354}, url={http://dx.doi.org/10.1016/j.watres.2018.09.060}, DOI={10.1016/j.watres.2018.09.060}, abstractNote={Biological floc size is an important reactor microenvironment parameter that is often not experimentally controlled due to a lack of suitable methods. Here, we introduce the Couette-Taylor bioreactor (CTB) as an improved tool for controlling biological floc size, specifically as compared with bubble-column sequencing batch reactors (SBRs). A CTB consists of two concentric walls, either of which may be rotated to induce fluid motion. The induced flow produces hydrodynamic shear which is more uniform than that produced through aeration in SBRs. Because hydrodynamic shear is a major parameter controlling floc size, we hypothesized the ability to better control shear rates within a CTB would enable better-controlled floc sizes. To test this hypothesis, we measured the particle size distributions of activated sludge flocs from CTBs with either inner (iCTB) or outer (oCTB) rotating walls as well as SBRs with varying height to diameter ratios (0.5, 1.1, and 9.4). The rotation speed of the CTBs and aeration rate of the SBRs were varied to produce predicted mean shear rates from 25 to 250 s-1. Further, the shear rate distributions for each experiment were estimated using computational fluid dynamics (CFD). In all SBR experiments, the floc distributions did not significantly vary with shear rate or geometry, likely because shear rates (estimated by CFD) differed much less than originally predicted by theory. In the CTB experiments, the mean particle size decreased proportionally with increased hydrodynamic shear, and iCTBs produced particle size distributions with smaller coefficients of variation than oCTBs (0.3 vs. 0.5-0.7, respectively).}, journal={Water Research}, publisher={Elsevier BV}, author={Weaver, Joseph E. and Hong, Hyunsuk and Ducoste, Joel J. and de los Reyes, Francis L., III}, year={2018}, month={Dec}, pages={177–183} }
 @misc{ducoste_2018, title={Development of Photochemical Microsensors for Evaluating Light Distributions within Algal Photosynthetic Bioreactors}, author={Ducoste, J.J.}, year={2018}, month={Apr} }
 @article{karam_de los reyes_ducoste_2018, title={Development of Photochemical Microsensors for Evaluating Photosynthetic Light Dose Distributions in Microalgal Photobioreactors}, volume={52}, ISSN={0013-936X 1520-5851}, url={http://dx.doi.org/10.1021/acs.est.8b02056}, DOI={10.1021/acs.est.8b02056}, abstractNote={We describe the development and testing of a Lagrangian method for quantifying light dose distributions within photobioreactors (PBRs) using novel photochemical microsensors. These microsensors were developed using 3-μm microspheres coated with a fluorescent dye that responds to wavelengths of visible light that are critical for photosynthesis. The dose-response kinetics of the microsensors was established by varying known doses of collimated light and quantifying the fluorescence responses of individual particles using flow cytometry. A deconvolution scheme was used to determine the light dose distribution from the fluorescence distribution of the microsensors. As proof-of-concept, the microsensors were used to quantify the photosynthetic light dose distributions within a gently mixed, 3 L flat-plate, batch PBR with and without algae and no gas bubbling and without algae but with gas bubbling. The microsensor approach not only provided information about the photosynthetic light distributions within the PBRs but also predicted the average light attenuation due to algal cells within 1% of estimates made with an in situ light sensor. The results showed that bubbles, under the conditions tested, increased the overall light irradiance by 18%; a result not captured by static measurements. The Lagrangian microsensors provide a novel approach for quantifying light within a photobioreactor.}, number={21}, journal={Environmental Science & Technology}, publisher={American Chemical Society (ACS)}, author={Karam, Amanda L. and de los Reyes, Francis L., III and Ducoste, Joel J.}, year={2018}, month={Sep}, pages={12538–12545} }
 @inproceedings{wang_lai_karam_de los reyes_ducoste_2018, title={Dynamic modeling of Dunaliella viridis growth and storage molecule production under different light and nitrogen conditions}, author={Wang, Diyuan and Lai, Yichun and Karam, Amanda and de los Reyes, Francis and Ducoste, Joel}, year={2018} }
 @inproceedings{kusum_pour-ghaz_ducoste_2018, title={Evaluating alternative binder materials for Sewer Collection System Concrete Structures to reduce FOG related SSOs}, author={Kusum, S. and Pour-Ghaz, M. and Ducoste, J.}, year={2018}, month={Apr} }
 @article{wang_matthews_williams_shi_yang_tunlaya-anukit_chen_li_liu_lin_et al._2018, title={Improving wood properties for wood utilization through multi-omics integration in lignin biosynthesis}, volume={9}, ISSN={2041-1723}, url={http://dx.doi.org/10.1038/s41467-018-03863-z}, DOI={10.1038/s41467-018-03863-z}, abstractNote={Abstract}, number={1}, journal={Nature Communications}, publisher={Springer Science and Business Media LLC}, author={Wang, Jack P. and Matthews, Megan L. and Williams, Cranos M. and Shi, Rui and Yang, Chenmin and Tunlaya-Anukit, Sermsawat and Chen, Hsi-Chuan and Li, Quanzi and Liu, Jie and Lin, Chien-Yuan and et al.}, year={2018}, month={Apr}, pages={1579} }
 @inproceedings{curran_broderick_ducoste_2018, title={Preliminary tests of sensors to detect sewer network blockages}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85054187336&partnerID=MN8TOARS}, DOI={10.13031/aim.201801691}, abstractNote={Abstract. Sewer blockages are a major problem in cities worldwide; these blockages are usually caused by a combination of fat, oil and grease waste and sanitary items that enter the network. This paper reports on preliminary tests of sensors to detect sewer network blockages in order to develop an advance warning system. Data from an ultrasonic level sensor were somewhat inconsistent while temperature records seem to be make more sense. The data capture level varied from 70-88% compared to what was originally planned, so data gaps are a concern. Further analysis is required along with testing of other sensors to determine which combinations work best.}, booktitle={ASABE 2018 Annual International Meeting}, author={Curran, T.P. and Broderick, C. and Ducoste, J.}, year={2018} }
 @misc{ducoste_2018, title={Slip Sliding away: Minimizing FOG Deposit Adhesion to Sewer Surfaces}, author={Ducoste, J.J.}, year={2018}, month={Aug} }
 @misc{ducoste_2018, title={The Art of a graduate school Application: What’s in the mind of Faculty}, author={Ducoste, J.J.}, year={2018}, month={Nov} }
 @misc{ducoste_2018, title={Tips/information to successfully navigate graduate school Application/Decision and Fellowship Opportunities}, publisher={University of North}, author={Ducoste, J.J.}, year={2018}, month={Oct} }
 @inproceedings{sadler_wischer_gordon_wilkerson_tabor_fredericks_ducoste_2018, title={Unintended Consequences of a Local Fats, Oils, and Grease Limits}, author={Sadler, M. and Wischer, B. and Gordon, J. and Wilkerson, C. and Tabor, C. and Fredericks, D. and Ducoste, J.}, year={2018}, month={Mar} }
 @inproceedings{hao_sun_ducoste_barlaz_2017, title={A Model to Describe Heat Generation and Accumulation at Municipal Solid Waste Landfills}, ISBN={9780784480434}, url={http://dx.doi.org/10.1061/9780784480434.030}, DOI={10.1061/9780784480434.030}, abstractNote={There have been reports of landfills in North America that are experiencing elevated temperatures that are resulting in challenging issues for landfill management. The objective of this study is to develop a box model to describe the generation, consumption and release of heat in landfills and subsequently to predict temperature profiles. Initially, a box model was developed that treats the landfill as a completely mixed system in which all relevant reactions are described. This model will make it possible to identify processes and reactions that are most significant. The model is based on thermodynamic principles and accounts for all significant heat sources and sinks in landfills. Heat sources include energy from biotic and abiotic reactions and condensation. Heat removal processes include convection of methane and carbon dioxide, infiltration, leachate collection and evaporation. The model was used to evaluate the heat generation performance of aerobic and anaerobic biodegradation of waste with and without the presence of ash (from coal or municipal solid waste). The model analysis showed that the hydration of ash can increase landfill temperature above that predicted for the disposal of municipal solid waste alone.}, number={276}, booktitle={Geotechnical Frontiers 2017}, publisher={American Society of Civil Engineers}, author={Hao, Zisu and Sun, Mei and Ducoste, Joel and Barlaz, Morton}, year={2017}, month={Mar}, pages={281–288} }
 @article{he_de los reyes_ducoste_2017, title={A critical review of fat, oil, and grease (FOG) in sewer collection systems: Challenges and control}, volume={47}, ISSN={1064-3389 1547-6537}, url={http://dx.doi.org/10.1080/10643389.2017.1382282}, DOI={10.1080/10643389.2017.1382282}, abstractNote={ABSTRACT Fat, oil, and grease (FOG) released into the sewer collection system have resulted in the production of insoluble solids, leading to FOG blockages in sanitary sewer pipes and consequently sanitary sewer overflows (SSOs). FOG-related SSOs continue to be a global challenge for municipalities responsible for maintaining the conveyance of wastewater in sanitary sewer systems. To provide a comprehensive understanding of FOG control in sewers, this paper critically reviews the scientific literature on the FOG deposit formation process, sources of components involved in FOG deposit formation, and solutions to the problems caused by FOG in sewer systems. The implications of these findings were also evaluated to provide support for pretreatment managers responsible for sewer collection system maintenance. Finally, the ongoing challenges in further understanding the FOG deposit formation process, the distribution of the sources of FOG/free fatty acids, the installation and maintenance of grease interceptors (GIs), and the recovery of energy from GI waste and FOG deposits, were also discussed to determine future research directions.}, number={13}, journal={Critical Reviews in Environmental Science and Technology}, publisher={Informa UK Limited}, author={He, Xia and de los Reyes, Francis L., III and Ducoste, Joel J.}, year={2017}, month={Jul}, pages={1191–1217} }
 @article{hao_malyala_dean_ducoste_2017, title={Attenuated Total Reflectance Fourier transform infrared spectroscopy for determination of Long Chain Free Fatty Acid concentration in oily wastewater using the double wavenumber extrapolation technique}, volume={165}, ISSN={["1873-3573"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85009062833&partnerID=MN8TOARS}, DOI={10.1016/j.talanta.2017.01.006}, abstractNote={Long Chain Free Fatty Acids (LCFFAs) from the hydrolysis of fat, oil and grease (FOG) are major components in the formation of insoluble saponified solids known as FOG deposits that accumulate in sewer pipes and lead to sanitary sewer overflows (SSOs). A Double Wavenumber Extrapolative Technique (DWET) was developed to simultaneously measure LCFFAs and FOG concentrations in oily wastewater suspensions. This method is based on the analysis of the Attenuated Total Reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) spectrum, in which the absorbance of carboxyl bond (1710cm-1) and triglyceride bond (1745cm-1) were selected as the characteristic wavenumbers for total LCFFAs and FOG, respectively. A series of experiments using pure organic samples (Oleic acid/Palmitic acid in Canola oil) were performed that showed a linear relationship between the absorption at these two wavenumbers and the total LCFFA. In addition, the DWET method was validated using GC analyses, which displayed a high degree of agreement between the two methods for simulated oily wastewater suspensions (1-35% Oleic acid in Canola oil/Peanut oil). The average determination error of the DWET approach was ~5% when the LCFFA fraction was above 10wt%, indicating that the DWET could be applied as an experimental method for the determination of both LCFFAs and FOG concentrations in oily wastewater suspensions. Potential applications of this DWET approach includes: (1) monitoring the LCFFAs and FOG concentrations in grease interceptor (GI) effluents for regulatory compliance; (2) evaluating alternative LCFFAs/FOG removal technologies; and (3) quantifying potential FOG deposit high accumulation zones in the sewer collection system.}, journal={TALANTA}, author={Hao, Zisu and Malyala, Divya and Dean, Lisa and Ducoste, Joel}, year={2017}, month={Apr}, pages={526–532} }
 @article{karam_mcmillan_lai_de los reyes_sederoff_grunden_ranjithan_levis_ducoste_2017, title={Construction and Setup of a Bench-scale Algal Photosynthetic Bioreactor with Temperature, Light, and pH Monitoring for Kinetic Growth Tests}, volume={6}, ISSN={1940-087X}, url={http://dx.doi.org/10.3791/55545}, DOI={10.3791/55545}, abstractNote={The optimal design and operation of photosynthetic bioreactors (PBRs) for microalgal cultivation is essential for improving the environmental and economic performance of microalgae-based biofuel production. Models that estimate microalgal growth under different conditions can help to optimize PBR design and operation. To be effective, the growth parameters used in these models must be accurately determined. Algal growth experiments are often constrained by the dynamic nature of the culture environment, and control systems are needed to accurately determine the kinetic parameters. The first step in setting up a controlled batch experiment is live data acquisition and monitoring. This protocol outlines a process for the assembly and operation of a bench-scale photosynthetic bioreactor that can be used to conduct microalgal growth experiments. This protocol describes how to size and assemble a flat-plate, bench-scale PBR from acrylic. It also details how to configure a PBR with continuous pH, light, and temperature monitoring using a data acquisition and control unit, analog sensors, and open-source data acquisition software.}, number={124}, journal={Journal of Visualized Experiments}, publisher={MyJove Corporation}, author={Karam, Amanda L. and McMillan, Catherine C. and Lai, Yi-Chun and de los Reyes, Francis L., III and Sederoff, Heike W. and Grunden, Amy M. and Ranjithan, Ranji S. and Levis, James W. and Ducoste, Joel J.}, year={2017}, month={Jun} }
 @misc{karam_ducoste_de los reyes_2017, title={Development of Photochemical Microsensors for Evaluating Light Distribution within Microalgal Photosynthetic Bioreactors}, author={Karam, A.L. and Ducoste, J.J. and de los Reyes, F.L., III}, year={2017}, month={Jun} }
 @misc{ducoste_2017, title={Drinking Water Treatment: What Happens from Source to Tap}, author={Ducoste, J.J.}, year={2017} }
 @article{hao_sun_ducoste_benson_luettich_castaldi_barlaz_2017, title={Heat Generation and Accumulation in Municipal Solid Waste Landfills}, volume={51}, ISSN={0013-936X 1520-5851}, url={http://dx.doi.org/10.1021/acs.est.7b01844}, DOI={10.1021/acs.est.7b01844}, abstractNote={There have been reports of North American landfills that are experiencing temperatures in excess of 80-100 °C. However, the processes causing elevated temperatures are not well understood. The objectives of this study were to develop a model to describe the generation, consumption and release of heat from landfills, to predict landfill temperatures, and to understand the relative importance of factors that contribute to heat generation and accumulation. Modeled heat sources include energy from aerobic and anaerobic biodegradation, anaerobic metal corrosion, ash hydration and carbonation, and acid-base neutralization. Heat removal processes include landfill gas convection, infiltration, leachate collection, and evaporation. The landfill was treated as a perfectly mixed batch reactor. Model predictions indicate that both anaerobic metal corrosion and ash hydration/carbonation contribute to landfill temperatures above those estimated from biological reactions alone. Exothermic pyrolysis of refuse, which is hypothesized to be initiated due to a local accumulation of heat, was modeled empirically to illustrate its potential impact on heat generation.}, number={21}, journal={Environmental Science & Technology}, publisher={American Chemical Society (ACS)}, author={Hao, Zisu and Sun, Mei and Ducoste, Joel J. and Benson, Craig H. and Luettich, Scott and Castaldi, Marco J. and Barlaz, Morton A.}, year={2017}, month={Oct}, pages={12434–12442} }
 @misc{ducoste_2017, title={Holy Dish Pan Hands Batman, there are Soaps in the Sewers: Fats, Oil, and Grease Issues in Sewer Systems}, author={Ducoste, J.J.}, year={2017} }
 @misc{williams_koryachko_matthiadis_muhammad_brady_ducoste_tuck_long_2017, title={Integrative Dynamic Modeling Using Diverse Biological Datasets}, author={Williams, Cranos and Koryachko, Alexandr and Matthiadis, Anna and Muhammad, Durreshahwar and Brady, Siobhan M. and Ducoste, Joel and Tuck, James and Long, Terri A.}, year={2017}, month={Jun} }
 @article{yousefelahiyeh_dominic_ducoste_2017, title={Modeling fats, oil and grease deposit formation and accumulation in sewer collection systems}, volume={19}, ISSN={["1465-1734"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85018765260&partnerID=MN8TOARS}, DOI={10.2166/hydro.2017.016}, abstractNote={Fats, oil and grease (FOG) deposits in sewer systems are responsible for approximately 25% of all annual line blockages in the United States and lead to the release of 3–10 million gallons of untreated wastewater to the surrounding environment. Considerable effort has been made to maintain the conveyance of wastewater by cleaning pipes that have a significant FOG deposit accumulation. Changes in the urban landscape from the addition or deletion of food service establishments (FSEs), however, may pose challenges in determining the location of these high accumulation zones. This research focuses on the development of a sewer collection system model that predicts high FOG deposit accumulation zones. Two collection systems were simulated to test the prediction capabilities of the tool and to assess how changes in the urban landscape affect the location of these accumulation zones. The numerical tool incorporates a mechanistic-based FOG deposit formation kinetic model. Results showed that the model predicts about 65% of the reported high FOG deposit accumulating zones. Simulations also showed significant changes in the location of these high FOG deposit accumulating zones from changes in the number and locations of FSEs and from FSE discharge and background wastewater flow variations.}, number={3}, journal={JOURNAL OF HYDROINFORMATICS}, author={Yousefelahiyeh, Roya and Dominic, Christopher Cyril Sandeep and Ducoste, Joel}, year={2017}, month={May}, pages={443–455} }
 @inproceedings{lai_karam_ranjithan_levis_de los reyes_ducoste_2017, title={Physiological responses of microalgae, Dunaliella viridis, during nitrogen–limited growth}, author={Lai, Y. C. and Karam, A. and Ranjithan, R. and Levis, J. and de los Reyes, F.L., III and Ducoste, J.}, year={2017}, month={Jun} }
 @inproceedings{karam_lai_liu_ranjithan_levis_de los reyes_ducoste_2017, title={Quantifying Light Distributions within Microalgal Photosynthetic Bioreactors Using Novel Microsensors}, author={Karam, A. and Lai, Y.C. and Liu, J. and Ranjithan, R. and Levis, J. and de los Reyes, F.L., III and Ducoste, J.}, year={2017}, month={Jun} }
 @misc{ducoste_2017, title={Raising the Value of Water: A strategy for Greater Public Health Protection}, author={Ducoste, J.J.}, year={2017} }
 @article{sadler_wischer_gordon_wilkerson_tabor_fredericks_ducoste_2017, title={Unintended Consequences of a Local Fats, Oils, and Grease Limits Revisions: One Utilizity’s Experience with FOG}, journal={Horizons New Letter}, author={Sadler, M. and Wischer, B. and Gordon, J. and Wilkerson, C. and Tabor, C. and Fredericks, D. and Ducoste, J.}, year={2017}, month={Aug} }
 @inproceedings{sadler_wischer_gordon_wilkerson_tabor_fredericks_ducoste_2017, title={Unintended consequences of a local limits revision: One utility's experience with fats, oils, and grease}, volume={8}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85052083486&partnerID=MN8TOARS}, booktitle={Water Environment Federation Technical Exhibition and Conference 2017, WEFTEC 2017}, author={Sadler, M. and Wischer, B. and Gordon, J. and Wilkerson, C. and Tabor, C. and Fredericks, D. and Ducoste, J.}, year={2017}, pages={5522–5534} }
 @inbook{wang_tunlaya-anukit_shi_yeh_chuang_isik_yang_liu_li_loziuk_et al._2016, title={A Proteomic-Based Quantitative Analysis of the Relationship Between Monolignol Biosynthetic Protein Abundance and Lignin Content Using TransgenicPopulus trichocarpa}, volume={5}, ISBN={9781118883303 9781118883266}, url={http://dx.doi.org/10.1002/9781118883303.ch4}, DOI={10.1002/9781118883303.ch4}, abstractNote={As part of a long-term project to develop a predictive model of lignin biosynthesis in the stem differentiating xylem of Populus trichocarpa, we explored the quantitative relationships of gene-specific monolignol pathway proteins and the amount of the lignin polymer. We determined the absolute abundance of monolignol pathway proteins in wild-type (Nisqually-1) and 80 transgenic trees, downregulated for the expression of genes in the monolignol pathway. Total lignin content for wild-type and transgenics ranged from 9.4 to 24.2%. Comparison of protein variation with lignin content showed that the proteins are produced in several-fold excess, suggesting that the monolignol pathway is highly homeostatic. Strong downregulation of xylem-specific PtrPAL2, 4, and 5 showed the most direct relationship with lignin content. These results are consistent with the Predictive Kinetic Metabolic Flux (PKMF) model of Wang et al., based on differential equations of mass action kinetics. Functional redundancy of multiple genes also moderates gene-specific effects. In addition, targeted production of specific proteins may affect the concentration of nontarget monolignol proteins, suggesting a yet-to-be-described level of coordinated control.}, booktitle={Recent Advances in Polyphenol Research}, publisher={John Wiley & Sons, Ltd}, author={Wang, Jack P. and Tunlaya-Anukit, Sermsawat and Shi, Rui and Yeh, Ting-Feng and Chuang, Ling and Isik, Fikret and Yang, Chenmin and Liu, Jie and Li, Quanzi and Loziuk, Philip L. and et al.}, editor={Kumi Yoshida, Veronique Cheynier and Quideau, StephaneEditors}, year={2016}, month={Dec}, pages={89–107} }
 @article{samstag_ducoste_griborio_nopens_batstone_wicks_saunders_wicklein_kenny_laurent_et al._2016, title={CFD for wastewater treatment: an overview}, volume={74}, ISSN={["1996-9732"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84982261315&partnerID=MN8TOARS}, DOI={10.2166/wst.2016.249}, abstractNote={Computational fluid dynamics (CFD) is a rapidly emerging field in wastewater treatment (WWT), with application to almost all unit processes. This paper provides an overview of CFD applied to a wide range of unit processes in water and WWT from hydraulic elements like flow splitting to physical, chemical and biological processes like suspended growth nutrient removal and anaerobic digestion. The paper's focus is on articulating the state of practice and research and development needs. The level of CFD's capability varies between different process units, with a high frequency of application in the areas of final sedimentation, activated sludge basin modelling and disinfection, and greater needs in primary sedimentation and anaerobic digestion. While approaches are comprehensive, generally capable of incorporating non-Newtonian fluids, multiphase systems and biokinetics, they are not broad, and further work should be done to address the diversity of process designs. Many units have not been addressed to date. Further needs are identified throughout, but common requirements include improved particle aggregation and breakup (flocculation), and improved coupling of biology and hydraulics.}, number={3}, journal={WATER SCIENCE AND TECHNOLOGY}, author={Samstag, R. W. and Ducoste, J. J. and Griborio, A. and Nopens, I. and Batstone, D. J. and Wicks, J. D. and Saunders, S. and Wicklein, E. A. and Kenny, G. and Laurent, J. and et al.}, year={2016}, month={Aug}, pages={549–563} }
 @misc{williams_koryachko_matthiadis_muhammad_foret_brady_ducoste_tuck_long_2016, title={Clustering and Differential Alignment Algorithm: Identification of Early Stage Regulators in the A. thaliana Iron Deficiency Response}, author={Williams, Cranos and Koryachko, Alexandr and Matthiadis, Anna and Muhammad, Durreshahwar and Foret, Jessica and Brady, Siobhan M. and Ducoste, Joel and Tuck, James and Long, Terri A.}, year={2016}, month={Mar} }
 @misc{matthiadis_koryachko_muhammad_foret_brady_ducoste_tuck_williams_long_2016, title={Computational prediction of regulatory relationships: New players in the Arabidopsis thaliana iron deficiency response}, author={Matthiadis, Anna and Koryachko, Alexandr and Muhammad, Durreshahwar and Foret, Jessica and Brady, Siobhan M. and Ducoste, Joel and Tuck, James and Williams, Cranos and Long, Terri A.}, year={2016}, month={Jul} }
 @inproceedings{hao_malyala_ducoste_2016, title={Determination of Long Chain Free Fatty Acid (LCFFA) in Wastewater Using a Novel Double Wavenumber FTIR Technique for the Protection of Sanitary Sewer Collection Systems}, author={Hao, Z. and Malyala, D. and Ducoste, J.}, year={2016}, month={Nov} }
 @inproceedings{malyala_hao_ducoste_2016, title={Determining the fate of Long Chain Free Fatty Acids and Fats, Oils and Grease in Sewer Collection Systems using a double waveband FTIR technique}, author={Malyala, D. and Hao, Z. and Ducoste, J.}, year={2016}, month={Nov} }
 @misc{de los reyes_wang_shen_yeh_aziz_ducoste_2016, title={Directing microbial community assembly in anaerobic reactors: implications for increasing methane yields and improving start-up}, author={de los Reyes, F. L., III and Wang, L. and Shen, P. and Yeh, J. and Aziz, T. and Ducoste, J.J.}, year={2016}, month={Mar} }
 @misc{ducoste_2016, title={Drinking Water Treatment: What Happens from Source to Tap}, author={Ducoste, J.J.}, year={2016} }
 @inproceedings{weaver_ducoste_reyes_2016, title={Fluid shear variation potentially plays a role in aerobic granular sludge formation}, volume={3}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85070715342&partnerID=MN8TOARS}, booktitle={WEFTEC 2016 - 89th Water Environment Federation Annual Technical Exhibition and Conference}, author={Weaver, J.E. and Ducoste, J.J. and Reyes, F.L.}, year={2016}, pages={5737–5744} }
 @misc{ducoste_2016, title={Game Changer: A New Technique for Measuring the Performance of Grease Interceptors}, author={Ducoste, J.J.}, year={2016} }
 @article{wicklein_batstone_ducoste_laurent_griborio_wicks_saunders_samstag_potier_nopens_et al._2016, title={Good modelling practice in applying computational fluid dynamics for WWTP modelling}, volume={73}, ISSN={["1996-9732"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84959896875&partnerID=MN8TOARS}, DOI={10.2166/wst.2015.565}, abstractNote={Computational fluid dynamics (CFD) modelling in the wastewater treatment (WWT) field is continuing to grow and be used to solve increasingly complex problems. However, the future of CFD models and their value to the wastewater field are a function of their proper application and knowledge of their limits. As has been established for other types of wastewater modelling (i.e. biokinetic models), it is timely to define a good modelling practice (GMP) for wastewater CFD applications. An International Water Association (IWA) working group has been formed to investigate a variety of issues and challenges related to CFD modelling in water and WWT. This paper summarizes the recommendations for GMP of the IWA working group on CFD. The paper provides an overview of GMP and, though it is written for the wastewater application, is based on general CFD procedures. A forthcoming companion paper to provide specific details on modelling of individual wastewater components forms the next step of the working group.}, number={5}, journal={WATER SCIENCE AND TECHNOLOGY}, author={Wicklein, E. and Batstone, D. J. and Ducoste, J. and Laurent, J. and Griborio, A. and Wicks, J. and Saunders, S. and Samstag, R. and Potier, O. and Nopens, I. and et al.}, year={2016}, month={Mar}, pages={969–982} }
 @misc{ducoste_2016, title={Grease Removal Devices: Challenges in the Removal of FOG Emulsions and the Impact of Food Service Establishment Operations}, author={Ducoste, J.J.}, year={2016} }
 @inproceedings{weaver_ducoste_de los reyes_2016, title={Inducing Aerobic Granular Sludge Formation Through Unevenly Distributed Hydrodynamic Shear Rates}, author={Weaver, J.E. and Ducoste, J.J. and de los Reyes, F.L.}, year={2016}, month={Nov} }
 @inproceedings{karam_de los reyes_levis_ranjithan_ducoste_2016, title={Photochemical Micro-sensors for Evaluating Light Distribution within Photosyntheitic Biioreactors for Biofuels Production}, author={Karam, A. and de los Reyes, F.L., III and Levis, J. and Ranjithan, R. and Ducoste, J.}, year={2016}, month={Jun} }
 @article{iasmin_dean_ducoste_2016, title={Quantifying fat, oil, and grease deposit formation kinetics}, volume={88}, ISSN={["0043-1354"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84947483809&partnerID=MN8TOARS}, DOI={10.1016/j.watres.2015.11.009}, abstractNote={Fat, oil, and grease (FOG) deposits formed in sanitary sewers are calcium-based saponified solids that are responsible for a significant number of nationwide sanitary sewer overflows (SSOs) across United States. In the current study, the kinetics of lab-based saponified solids were determined to understand the kinetics of FOG deposit formation in sewers for two types of fat (Canola and Beef Tallow) and two types of calcium sources (calcium chloride and calcium sulfate) under three pH (7 ± 0.5, 10 ± 0.5, and ≈14) and two temperature conditions (22 ± 0.5 and 45 ± 0.5 °C). The results of this study displayed quick reactions of a fraction of fats with calcium ions to form calcium based saponified solids. Results further showed that increased palmitic fatty acid content in source fats, the magnitude of the pH, and temperature significantly affect the FOG deposit formation and saponification rates. The experimental data of the kinetics were compared with two empirical models: a) Cotte saponification model and b) Foubert crystallization model and a mass-action based mechanistic model that included alkali driven hydrolysis of triglycerides. Results showed that the mass action based mechanistic model was able to predict changes in the rate of formation of saponified solids under the different experimental conditions compared to both empirical models. The mass-action based saponification model also revealed that the hydrolysis of Beef Tallow was slower compared to liquid Canola fat resulting in smaller quantities of saponified solids. This mechanistic saponification model, with its ability to track the saponified solids chemical precursors, may provide an initial framework to predict the spatial formation of FOG deposits in municipal sewers using system wide sewer collection modeling software.}, journal={WATER RESEARCH}, author={Iasmin, Mahbuba and Dean, Lisa O. and Ducoste, Joel J.}, year={2016}, month={Jan}, pages={786–795} }
 @article{xiong_fu_singh_ducoste_2016, title={Structural characteristics and development of the cake layer in a dynamic membrane bioreactor}, volume={167}, ISSN={["1873-3794"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84966928788&partnerID=MN8TOARS}, DOI={10.1016/j.seppur.2016.04.040}, abstractNote={The cake layers play a key role in the rejection of particles in dynamic membrane bioreactors and produces most of the resistance. This research aims to directly observe and measure the transient structure of the cake layers at different times and depths. The results showed the membrane flux remained relatively stable for the first 30 h, but decreased from 110 L/m2 h to 88 L/m2 h in the next 20 h. The membrane resistance was highly correlated with the cake layer thickness. The porosity and average pore diameter obtained from the scanning electron microcopy (SEM) pictures displayed no temporal variations, as only the new generated surface of the cake layer can be observed by SEM. However, the specific pore volume and surface area based on the Brunauer–Emmett–Teller (BET) nitrogen adsorption results displayed an initial decline, from 0.30 cc/g to 0.22 cc/g, due to the disappearance of the small diameter pores (1–10 nm) with time. The large diameter pores (30–250 nm) accounted for the majority of the cumulative pore volumes in all samples, as well as in the top layer, middle layer, and bottom layer. The specific pore volume and specific surface area exhibited a decline from the top layer to bottom layer, from 0.38 cc/g to 0.21 cc/g, due to the blockage of large diameter pores. In addition, BET nitrogen adsorption data provided comprehensive structural characteristics of the cake layers.}, journal={SEPARATION AND PURIFICATION TECHNOLOGY}, author={Xiong, Jianglei and Fu, Dafang and Singh, Rajendra Prasad and Ducoste, Joel J.}, year={2016}, month={Jul}, pages={88–96} }
 @article{blaney_kandiah_ducoste_perlinger_bartelt-hunt_2016, title={Trends in Population and Demographics of US Environmental Engineering Students and Faculty from 2005 to 2013}, volume={33}, ISSN={["1557-9018"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84979691960&partnerID=MN8TOARS}, DOI={10.1089/ees.2016.0063}, abstractNote={Abstract Although modern environmental engineering was established in the mid 1900s, the field has arguably evolved into its own professional discipline only in the past 3–4 decades. During this time, the number of environmental engineering students, faculty, and practitioners has grown dramatically, and many environmental engineering BS degree programs were established. To better assess this growth, we have conducted an analysis of the demographics of environmental engineering students and faculty using the American Society for Engineering Education (ASEE) Engineering Data Management System. One limitation of the ASEE database is that only students and faculty primarily associated with environmental engineering degrees and programs, respectively, are counted; therefore, students and faculty related to environmental engineering tracks within civil and chemical engineering programs are excluded from this analysis. From 2005 to 2013, the number of BS, MS, and PhD degrees awarded rose by 90%, 27%, and 39%, r...}, number={8}, journal={ENVIRONMENTAL ENGINEERING SCIENCE}, author={Blaney, Lee and Kandiah, Ramanitharan and Ducoste, Joel J. and Perlinger, Judith A. and Bartelt-Hunt, Shannon L.}, year={2016}, month={Aug}, pages={578–590} }
 @misc{hao_sun_ducoste_barlaz_benson_castaldi_luettich_2016, title={Understanding and Predicting Temperatures in Municipal Solid Waste Landfills}, author={Hao, Z. and Sun, M. and Ducoste, J. and Barlaz, M. and Benson, C. and Castaldi, M. and Luettich, S.}, year={2016}, month={Jan} }
 @misc{matthiadis_koryachko_muhammad_foret_brady_ducoste_tuck_williams_long_2015, title={Algorithm application to identify novel regulators in the Arabidopsis thaliana iron deficiency response}, author={Matthiadis, Anna and Koryachko, Alexandr and Muhammad, Durreshahwar and Foret, Jessica and Brady, Siobhan M. and Ducoste, Joel and Tuck, James and Williams, Cranos and Long, Terri A.}, year={2015}, month={Jul} }
 @article{koryachko_matthiadis_muhammad_foret_brady_ducoste_tuck_long_williams_2015, title={Clustering and Differential Alignment Algorithm: Identification of Early Stage Regulators in the Arabidopsis thaliana Iron Deficiency Response}, volume={10}, ISSN={["1932-6203"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84943338816&partnerID=MN8TOARS}, DOI={10.1371/journal.pone.0136591}, abstractNote={Time course transcriptome datasets are commonly used to predict key gene regulators associated with stress responses and to explore gene functionality. Techniques developed to extract causal relationships between genes from high throughput time course expression data are limited by low signal levels coupled with noise and sparseness in time points. We deal with these limitations by proposing the Cluster and Differential Alignment Algorithm (CDAA). This algorithm was designed to process transcriptome data by first grouping genes based on stages of activity and then using similarities in gene expression to predict influential connections between individual genes. Regulatory relationships are assigned based on pairwise alignment scores generated using the expression patterns of two genes and some inferred delay between the regulator and the observed activity of the target. We applied the CDAA to an iron deficiency time course microarray dataset to identify regulators that influence 7 target transcription factors known to participate in the Arabidopsis thaliana iron deficiency response. The algorithm predicted that 7 regulators previously unlinked to iron homeostasis influence the expression of these known transcription factors. We validated over half of predicted influential relationships using qRT-PCR expression analysis in mutant backgrounds. One predicted regulator-target relationship was shown to be a direct binding interaction according to yeast one-hybrid (Y1H) analysis. These results serve as a proof of concept emphasizing the utility of the CDAA for identifying unknown or missing nodes in regulatory cascades, providing the fundamental knowledge needed for constructing predictive gene regulatory networks. We propose that this tool can be used successfully for similar time course datasets to extract additional information and infer reliable regulatory connections for individual genes.}, number={8}, journal={PLOS ONE}, author={Koryachko, Alexandr and Matthiadis, Anna and Muhammad, Durreshahwar and Foret, Jessica and Brady, Siobhan M. and Ducoste, Joel J. and Tuck, James and Long, Terri A. and Williams, Cranos}, year={2015}, month={Aug} }
 @article{koryachko_matthiadis_ducoste_tuck_long_williams_2015, title={Computational approaches to identify regulators of plant stress response using high-throughput gene expression data}, volume={3-4}, ISSN={2214-6628}, url={http://dx.doi.org/10.1016/j.cpb.2015.04.001}, DOI={10.1016/j.cpb.2015.04.001}, abstractNote={Insight into biological stress regulatory pathways can be derived from high-throughput transcriptomic data using computational algorithms. These algorithms can be integrated into a computational approach to provide specific testable predictions that answer biological questions of interest. This review conceptually organizes a wide variety of developed algorithms into a classification system based on desired type of output predictions. This classification is then used as a structure to describe completed approaches in the literature, with a focus on project goals, overall path of implemented algorithms, and biological insight gained. These algorithms and approaches are introduced mainly in the context of research on the model plant species Arabidopsis thaliana under stress conditions, though the nature of computational techniques makes these approaches easily applicable to a wide range of species, data types, and conditions.}, journal={Current Plant Biology}, publisher={Elsevier BV}, author={Koryachko, Alexandr and Matthiadis, Anna and Ducoste, Joel J. and Tuck, James and Long, Terri A. and Williams, Cranos}, year={2015}, month={Sep}, pages={20–29} }
 @article{ducoste_alpert_2015, title={Computational fluid dynamics modeling alternatives for UV-initiated advanced oxidation processes}, volume={50}, ISSN={["1201-3080"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84961377595&partnerID=MN8TOARS}, DOI={10.2166/wqrjc.2014.035}, abstractNote={Design and optimization of ultraviolet-initiated (UV-initiated) advanced oxidation processes (AOPs) using hydrogen peroxide (H2O2) must consider both system configuration and chemical kinetics. Alternative approaches to modeling AOP systems have been proposed in the literature; yet, due to the complex nature of the reactions involved, the literature lacks clarity in the appropriate selection of a modeling approach to help define the UV/AOP system performance. Computational fluid dynamics (CFD) was compared to the numerical solution of a system of ordinary differential equations describing the reaction mechanism for hydroxyl radical production and methylene blue destruction and to a UV dose distribution analysis produced by a Lagrangian particle track in CFD with a given dose–response curve. Similar analyses were also performed to simulate the destruction of tris(2-chloroethyl) phosphate (TCEP) and tributyl phosphate (TBP), in two different photoreactors. To validate the simulations, the results of the models were compared to pilot reactor trials for methylene blue bleaching and literature data for TCEP and TBP. Modeling results suggest that the agreement of both CFD Eulerian and Lagrangian approaches to simulating the UV/H2O2 AOP is a function of reactor design, the water matrix, and operating conditions.}, number={1}, journal={WATER QUALITY RESEARCH JOURNAL OF CANADA}, author={Ducoste, Joel J. and Alpert, Scott M.}, year={2015}, pages={4–20} }
 @inproceedings{manavi_de los reyes_levis_ranjithan_ducoste_2015, title={Coupling fluid dynamics with kinetic modeling to quantify the effects of photosynthetic bioreactor design and operation on yield performance}, author={Manavi, R. and de los Reyes, F.L., III and Levis, J. and Ranjithan, R. and Ducoste, J.}, year={2015} }
 @inproceedings{wang_hossen_aziz_ducoste_de los reyes_2015, place={Alexandria, VA}, title={Directing Microbial Community Assembly by Deterministic Niche Differentiaion in Anaerobic Digesters}, booktitle={WEFTEC 2015 : the water quality event : conference program and exhibitor guide : 88th Annual Water Environment Federation Technical Exhibition and Conference, McCormick Place, Chicago, Illinois, USA, September 26-30, 2015}, publisher={Water Environment Federation}, author={Wang, L. and Hossen, E.H. and Aziz, T.N. and Ducoste, J. and de los Reyes, F.L., III}, year={2015} }
 @article{jenny_jasper_simmons_shatalov_ducoste_2015, title={Heuristic optimization of a continuous flow point-of-use UV-LED disinfection reactor using computational fluid dynamics}, volume={83}, ISSN={0043-1354}, url={http://dx.doi.org/10.1016/j.watres.2015.06.031}, DOI={10.1016/j.watres.2015.06.031}, abstractNote={Alternative disinfection sources such as ultraviolet light (UV) are being pursued to inactivate pathogenic microorganisms such as Cryptosporidium and Giardia, while simultaneously reducing the risk of exposure to carcinogenic disinfection by-products (DBPs) in drinking water. UV-LEDs offer a UV disinfecting source that do not contain mercury, have the potential for long lifetimes, are robust, and have a high degree of design flexibility. However, the increased flexibility in design options will add a substantial level of complexity when developing a UV-LED reactor, particularly with regards to reactor shape, size, spatial orientation of light, and germicidal emission wavelength. Anticipating that LEDs are the future of UV disinfection, new methods are needed for designing such reactors. In this research study, the evaluation of a new design paradigm using a point-of-use UV-LED disinfection reactor has been performed. ModeFrontier, a numerical optimization platform, was coupled with COMSOL Multi-physics, a computational fluid dynamics (CFD) software package, to generate an optimized UV-LED continuous flow reactor. Three optimality conditions were considered: 1) single objective analysis minimizing input supply power while achieving at least (2.0) log10 inactivation of Escherichia coli ATCC 11229; and 2) two multi-objective analyses (one of which maximized the log10 inactivation of E. coli ATCC 11229 and minimized the supply power). All tests were completed at a flow rate of 109 mL/min and 92% UVT (measured at 254 nm). The numerical solution for the first objective was validated experimentally using biodosimetry. The optimal design predictions displayed good agreement with the experimental data and contained several non-intuitive features, particularly with the UV-LED spatial arrangement, where the lights were unevenly populated throughout the reactor. The optimal designs may not have been developed from experienced designers due to the increased degrees of freedom offered by using UV-LEDs. The results of this study revealed that the coupled optimization routine with CFD was effective at significantly decreasing the engineer's design decision space and finding a potentially near-optimal UV-LED reactor solution.}, journal={Water Research}, publisher={Elsevier BV}, author={Jenny, Richard M. and Jasper, Micah N. and Simmons, Otto D., III and Shatalov, Max and Ducoste, Joel J.}, year={2015}, month={Oct}, pages={310–318} }
 @misc{ducoste_2015, title={How Restaurant Kitchen Practices Influence FOG Deposit Formation in Sewer Collection Systems}, author={Ducoste, J.J.}, year={2015} }
 @inproceedings{wang_hossen_aziz_ducoste_de los reyes_2015, title={How to train your digester - Using step and pulse feeding of grease waste to increase community resistance and methane yield by up to 336%}, volume={3}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84983745996&partnerID=MN8TOARS}, booktitle={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Wang, L. and Hossen, E.H. and Aziz, T.N. and Ducoste, J.J. and De Los Reyes, F.L.}, year={2015}, pages={1581–1589} }
 @misc{ducoste_2015, title={Internal and External Grease Interceptors: Challenges in the Removal of FOG Emulsions and the Impact of Food Service Establishment Kitchen Operations}, author={Ducoste, J.J.}, year={2015} }
 @article{nopens_torfs_ducoste_vanrolleghem_gernaey_2015, title={Population balance models: a useful complementary modelling framework for future WWTP modelling}, volume={71}, ISSN={["1996-9732"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84923489194&partnerID=MN8TOARS}, DOI={10.2166/wst.2014.500}, abstractNote={Population balance models (PBMs) represent a powerful modelling framework for the description of the dynamics of properties that are characterised by distributions. This distribution of properties under transient conditions has been demonstrated in many chemical engineering applications. Modelling efforts of several current and future unit processes in wastewater treatment plants could potentially benefit from this framework, especially when distributed dynamics have a significant impact on the overall unit process performance. In these cases, current models that rely on average properties cannot sufficiently capture the true behaviour and even lead to completely wrong conclusions. Examples of distributed properties are bubble size, floc size, crystal size or granule size. In these cases, PBMs can be used to develop new knowledge that can be embedded in our current models to improve their predictive capability. Hence, PBMs should be regarded as a complementary modelling framework to biokinetic models. This paper provides an overview of current applications, future potential and limitations of PBMs in the field of wastewater treatment modelling, thereby looking over the fence to other scientific disciplines.}, number={2}, journal={WATER SCIENCE AND TECHNOLOGY}, author={Nopens, Ingmar and Torfs, Elena and Ducoste, Joel and Vanrolleghem, Peter A. and Gernaey, Krist V.}, year={2015}, pages={159–167} }
 @inproceedings{vallabh_seyam_banks-lee_ducoste_2015, title={Pore Channel Tortuosity in 3D Nonwoven Structures}, author={Vallabh, R. and Seyam, A. and Banks-Lee, P. and Ducoste, J.}, year={2015}, month={May} }
 @inproceedings{wang_hossen_aziz_ducoste_reyes_2015, title={Using 16s metagenomics to determine microbial population shifts associated with a 336% boost in methane yield during anaerobic co-digestion of grease waste}, volume={8}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84992022948&partnerID=MN8TOARS}, booktitle={88th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2015}, author={Wang, L. and Hossen, E.H. and Aziz, T.N. and Ducoste, J. and Reyes, F.L.}, year={2015}, pages={6112–6118} }
 @article{laurent_samstag_ducoste_griborio_nopens_batstone_wicks_saunders_potier_2014, title={A protocol for the use of computational fluid dynamics as a supportive tool for wastewater treatment plant modelling}, volume={70}, ISSN={["1996-9732"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84918816988&partnerID=MN8TOARS}, DOI={10.2166/wst.2014.425}, abstractNote={To date, computational fluid dynamics (CFD) models have been primarily used for evaluation of hydraulic problems at wastewater treatment plants (WWTPs). A potentially more powerful use, however, is to simulate integrated physical, chemical and/or biological processes involved in WWTP unit processes on a spatial scale and to use the gathered knowledge to accelerate improvement in plant models for everyday use, that is, design and optimized operation. Evolving improvements in computer speed and memory and improved software for implementing CFD, as well as for integrated processes, has allowed for broader usage of this tool for understanding, troubleshooting, and optimal design of WWTP unit processes. This paper proposes a protocol for an alternative use of CFD in process modelling, as a way to gain insight into complex systems leading to improved modelling approaches used in combination with the IWA activated sludge models and other kinetic models.}, number={10}, journal={WATER SCIENCE AND TECHNOLOGY}, author={Laurent, J. and Samstag, R. W. and Ducoste, J. M. and Griborio, A. and Nopens, I. and Batstone, D. J. and Wicks, J. D. and Saunders, S. and Potier, O.}, year={2014}, pages={1575–1584} }
 @inproceedings{samstag_ducoste_gribrio_nopens_batstone_wicks_saunders_laurent_potier_2014, title={CFD as a tool for WWTP Unit Process Modeling}, author={Samstag, R. and Ducoste, J. and Gribrio, A. and Nopens, I. and Batstone, D. and Wicks, J. and Saunders, S. and Laurent, J. and Potier, O.}, year={2014}, month={Mar} }
 @inproceedings{jenny_ducoste_2014, title={Challenges in Designing a UV LED Reactor for Disinfection: Why CFD Should be your Best Friend}, author={Jenny, R. and Ducoste, J.}, year={2014}, month={Nov} }
 @article{wang_naik_chen_shi_lin_liu_shuford_li_sun_tunlaya-anukit_et al._2014, title={Complete Proteomic-Based Enzyme Reaction and Inhibition Kinetics Reveal How Monolignol Biosynthetic Enzyme Families Affect Metabolic Flux and Lignin in Populus trichocarpa}, volume={26}, ISSN={1040-4651 1532-298X}, url={http://dx.doi.org/10.1105/tpc.113.120881}, DOI={10.1105/tpc.113.120881}, abstractNote={A proteomic-based predictive kinetic metabolic-flux model was developed for monolignol biosynthesis in Populus trichocarpa. Absolute quantities of all monolignol pathway proteins and 189 kinetic parameters were generated to construct the model, which was experimentally validated in transgenic P. trichocarpa and provides a comprehensive description of the monolignol biosynthetic pathway. We established a predictive kinetic metabolic-flux model for the 21 enzymes and 24 metabolites of the monolignol biosynthetic pathway using Populus trichocarpa secondary differentiating xylem. To establish this model, a comprehensive study was performed to obtain the reaction and inhibition kinetic parameters of all 21 enzymes based on functional recombinant proteins. A total of 104 Michaelis-Menten kinetic parameters and 85 inhibition kinetic parameters were derived from these enzymes. Through mass spectrometry, we obtained the absolute quantities of all 21 pathway enzymes in the secondary differentiating xylem. This extensive experimental data set, generated from a single tissue specialized in wood formation, was used to construct the predictive kinetic metabolic-flux model to provide a comprehensive mathematical description of the monolignol biosynthetic pathway. The model was validated using experimental data from transgenic P. trichocarpa plants. The model predicts how pathway enzymes affect lignin content and composition, explains a long-standing paradox regarding the regulation of monolignol subunit ratios in lignin, and reveals novel mechanisms involved in the regulation of lignin biosynthesis. This model provides an explanation of the effects of genetic and transgenic perturbations of the monolignol biosynthetic pathway in flowering plants.}, number={3}, journal={The Plant Cell}, publisher={American Society of Plant Biologists (ASPB)}, author={Wang, Jack P. and Naik, Punith P. and Chen, Hsi-Chuan and Shi, Rui and Lin, Chien-Yuan and Liu, Jie and Shuford, Christopher M. and Li, Quanzi and Sun, Ying-Hsuan and Tunlaya-Anukit, Sermsawat and et al.}, year={2014}, month={Mar}, pages={894–914} }
 @inproceedings{jenny_ducoste_2014, title={Computational Fluid Dynamics Optimization of a Continuous Flow Point of Use UV LED Disinfection Reactor}, author={Jenny, R. and Ducoste, J.}, year={2014} }
 @inproceedings{olukanni_ducoste_george_2014, title={Creating Water, Sanitation, and Hygiene (WASH) Program Awareness in Schools: A tool Towards the Success of Community WASH Programs,}, ISBN={9788461705573}, booktitle={EDULEARN14 Proceedings}, publisher={IATED}, author={Olukanni, D.O. and Ducoste, J. and George, T.O.}, year={2014}, month={Jul}, pages={6922–6927} }
 @misc{ducoste_2014, title={Data and CFD to Compare Horizontal and Vertical/enclosed UV Reactors}, author={Ducoste, J.J.}, year={2014} }
 @article{iasmin_ducoste_2014, title={Effect of source and environmental factors on properties and kinetics of FOG deposits in sewer collection systems}, volume={2014}, ISSN={1938-6478}, url={http://dx.doi.org/10.2175/193864714816099266}, DOI={10.2175/193864714816099266}, number={4}, journal={Proceedings of the Water Environment Federation}, publisher={Water Environment Federation}, author={Iasmin, Mahbuba and Ducoste, Joel J.}, year={2014}, month={Oct}, pages={1–11} }
 @article{fu_kai_singh_ducoste_2014, title={Enhanced Nitrogen Removal by Rice Husk Amended Dynamic Membrane Bioreactors}, volume={140}, ISSN={0733-9372 1943-7870}, url={http://dx.doi.org/10.1061/(ASCE)EE.1943-7870.0000840}, DOI={10.1061/(asce)ee.1943-7870.0000840}, abstractNote={AbstractEffective and low-cost dynamic membrane bioreactors (DMBR) can be a strong option for wastewater treatment in developing countries. The goal of this study was to investigate the effect of rice husk addition on the DMBR’s nitrogen removal performance. Tests were performed at both lab-scale and pilot-scale facilities. Results showed that rice husk served as a suitable biofilm carrier as well as an effective denitrification carbon source. In lab-scale experiments, the removal efficiency of rice husk amended DMBR for chemical oxygen demand (COD), NH3-N, and total nitrogen (TN) was 96.7, 96.3, and 80.4%, respectively. Results from the pilot-scale DMBR system showed that removal efficiency for COD and NH3-N was 90.3 and 95.2%, respectively, whereas TN removal was comparatively lower (50.5%). Fluorescence in situ hybridization (FISH) analysis showed that the bacterial population was higher in the rice husk added DMBR than the controlled DMBR, and ammonia-oxidizing bacteria were the main components of tot...}, number={11}, journal={Journal of Environmental Engineering}, publisher={American Society of Civil Engineers (ASCE)}, author={Fu, DaFang and Kai, Hong and Singh, Rajendra Prasad and Ducoste, Joel J.}, year={2014}, month={Nov}, pages={04014035} }
 @misc{ducoste_2014, title={Evaluation of Alternative Herbicides for Root Control: Should we be worried about their impact on Wastewater Treatment Plants?}, author={Ducoste, J.J.}, year={2014} }
 @article{yousefelahiyeh_roya_dominic_sandeep_ducoste_joel_2014, title={FOGISEW: Modeling FOG Deposit Formation in Sewer Collection System}, volume={2014}, DOI={10.2175/193864714816099365}, number={4}, journal={Proceedings of the Water Environment Federation}, publisher={Water Environment Federation}, author={Yousefelahiyeh and Roya and Dominic and Sandeep, Christopher Cyril and Ducoste and Joel, J}, year={2014}, month={Oct}, pages={1–10} }
 @article{iasmin_dean_lappi_ducoste_2014, title={Factors that influence properties of FOG deposits and their formation in sewer collection systems}, volume={49}, ISSN={["0043-1354"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84889588357&partnerID=MN8TOARS}, DOI={10.1016/j.watres.2013.11.012}, abstractNote={Understanding the formation of Fat, Oil, and Grease (FOG) deposits in sewer systems is critical to the sustainability of sewer collection systems since they have been implicated in causing sewerage blockages that leads to sanitary sewer overflows (SSOs). Recently, FOG deposits in sewer systems displayed strong similarities with calcium-based fatty acid salts as a result of a saponification reaction. The objective of this study was to quantify the factors that may affect the formation of FOG deposits and their chemical and rheological properties. These factors included the types of fats used in FSEs, environmental conditions (i.e. pH and temperature), and the source of calcium in sewer systems. The results of this study showed that calcium content in the calcium based salts seemed to depend on the solubility limit of the calcium source and influenced by pH and temperature conditions. The fatty acid profile of the calcium-based fatty acid salts produced under alkali driven hydrolysis were identical to the profile of the fat source and did not match the profile of field FOG deposits, which displayed a high fraction of palmitic, a long chain saturated fatty acid. It is hypothesized that selective microbial metabolism of fats and/or biologically induced hydrogenation may contribute to the FOG deposit makeup in sewer system. Therefore, selective removal of palmitic in pretreatment processes may be necessary prior to the discharge of FSE wastes into the sewer collection system.}, journal={WATER RESEARCH}, author={Iasmin, Mahbuba and Dean, Lisa O. and Lappi, Simon E. and Ducoste, Joel J.}, year={2014}, month={Feb}, pages={92–102} }
 @inproceedings{weaver_ducoste_de los reyes_2014, title={Influencing Aerobic Granulation through Variable Shear in an Eccentric Couette Micro-Reactor}, author={Weaver, J. and Ducoste, J. and de los Reyes, F.L.}, year={2014}, month={Nov} }
 @article{jenny_simmons_shatalov_ducoste_2014, title={Modeling a continuous flow ultraviolet Light Emitting Diode reactor using computational fluid dynamics}, volume={116}, ISSN={["1873-4405"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84902352092&partnerID=MN8TOARS}, DOI={10.1016/j.ces.2014.05.020}, abstractNote={The use of ultraviolet (UV) light for water treatment disinfection has become increasingly popular due to its ability to inactivate chlorine-resistant microorganisms without the production of known disinfection by-products. Currently, mercury-based lamps are the most commonly used UV disinfection source; however, these lamps are toxic if broken during installation or by foreign object strike during normal operation. In addition, disposal of degraded, hazardous mercury lamps can be challenging in rural and developing countries for point-of-use (POU) drinking water disinfection applications. UV Light Emitting Diodes (LEDs) offer an alternative, non-toxic UV source that will provide design flexibility due to their small size, longer operating life, and fewer auxiliary electronics than traditional mercury-based lamps. Modeling of UV reactor performance has been a significant approach to the engineering of UV reactors in drinking water treatment. Yet, no research has been performed on the experimental and modeling of a continuous flow UV-LED reactor. A research study was performed to validate a numerical computational fluid dynamics (CFD) model of a continuous flow UV-LED water disinfection process. Reactor validation consisted of the following: (1) hydraulic analysis using tracer tests, (2) characterization of the average light distribution using chemical actinometry, and (3) microbial dose–response and inactivation using biodosimetry. Results showed good agreement between numerical simulations and experimental testing. Accuracy of fluid velocity profile increased as flow rate increased from 109 mL/min to 190 mL/min, whereas chemical actinometry saw better agreement at the low flow rate. Biodosimetry testing was compared only at the low flow rate and saw good agreement for log inactivation of bacteriophage Qβ and MS-2 at 92% and 80% UV transmittance (UVT). The results from this research can potentially be used for the design of alternative point-of-use drinking water disinfection reactors in developing countries using UV LEDs.}, journal={CHEMICAL ENGINEERING SCIENCE}, author={Jenny, Richard M. and Simmons, Otto D., III and Shatalov, Max and Ducoste, Joel J.}, year={2014}, month={Sep}, pages={524–535} }
 @inproceedings{nopens_torfs_ducoste_vanrolleghem_gernaey_2014, title={PBMs: A Modeling Framework for WWTP Modeling}, author={Nopens, I. and Torfs, E. and Ducoste, J. and Vanrolleghem, P. and Gernaey, K.}, year={2014}, month={Mar} }
 @inproceedings{wang_hossen_aziz_ducoste_bullard_de los reyes_2014, title={Pulse Feeding Of Anaerobic Digesters Treating Grease Waste To Increase Community Resistance}, author={Wang, L. and Hossen, E.H. and Aziz, T.N. and Ducoste, J. and Bullard, M. and de los Reyes, F.L.}, year={2014}, month={Sep} }
 @inproceedings{wang_hossen_aziz_ducoste_bullard_de los reyes_2014, title={Step and Pulse Feeding Of Anaerobic Co-Digesters Treating Thickened Waste Activated Sludge and Grease Interceptor Waste}, author={Wang, L. and Hossen, E.H. and Aziz, T.N. and Ducoste, J. and Bullard, M. and de los Reyes, F.L.}, year={2014}, month={Mar} }
 @article{chen_song_wang_lin_ducoste_shuford_liu_li_shi_nepomuceno_et al._2014, title={Systems Biology of Lignin Biosynthesis in Populus trichocarpa: Heteromeric 4-Coumaric Acid:Coenzyme A Ligase Protein Complex Formation, Regulation, and Numerical Modeling}, volume={26}, ISSN={1040-4651 1532-298X}, url={http://dx.doi.org/10.1105/tpc.113.119685}, DOI={10.1105/tpc.113.119685}, abstractNote={This work shows that 4CL, an enzyme in monolignol biosynthesis, is found as a heterotetrameric complex of two isoforms in Populus trichocarpa. The activity of the heterotetramer can be described by a mathematical model that explains the effects of each isoform with mixtures of substrates and three types of inhibition, providing insights into the regulation of metabolic flux for this pathway. As a step toward predictive modeling of flux through the pathway of monolignol biosynthesis in stem differentiating xylem of Populus trichocarpa, we discovered that the two 4-coumaric acid:CoA ligase (4CL) isoforms, 4CL3 and 4CL5, interact in vivo and in vitro to form a heterotetrameric protein complex. This conclusion is based on laser microdissection, coimmunoprecipitation, chemical cross-linking, bimolecular fluorescence complementation, and mass spectrometry. The tetramer is composed of three subunits of 4CL3 and one of 4CL5. 4CL5 appears to have a regulatory role. This protein–protein interaction affects the direction and rate of metabolic flux for monolignol biosynthesis in P. trichocarpa. A mathematical model was developed for the behavior of 4CL3 and 4CL5 individually and in mixtures that form the enzyme complex. The model incorporates effects of mixtures of multiple hydroxycinnamic acid substrates, competitive inhibition, uncompetitive inhibition, and self-inhibition, along with characteristic of the substrates, the enzyme isoforms, and the tetrameric complex. Kinetic analysis of different ratios of the enzyme isoforms shows both inhibition and activation components, which are explained by the mathematical model and provide insight into the regulation of metabolic flux for monolignol biosynthesis by protein complex formation.}, number={3}, journal={The Plant Cell}, publisher={Oxford University Press (OUP)}, author={Chen, Hsi-Chuan and Song, Jina and Wang, Jack P. and Lin, Ying-Chung and Ducoste, Joel and Shuford, Christopher M. and Liu, Jie and Li, Quanzi and Shi, Rui and Nepomuceno, Angelito and et al.}, year={2014}, month={Mar}, pages={876–893} }
 @inproceedings{matthiadis_koryachko_muhammad_ducoste_tuck_williams_long_2014, title={Using a systems biology approach to identify key transcriptional regulators in the Arabidopsis thaliana iron deficiency response}, author={Matthiadis, Anna and Koryachko, Alexandr and Muhammad, Durreshahwar and Ducoste, Joel and Tuck, James and Williams, Cranos and Long, Terri}, year={2014} }
 @inproceedings{yousefelahiyeh_dominic_ducoste_2013, title={A numerical method to simulate and assess the formation of Fats, Oils & Grease (FOG) deposits in a sewer collection system}, volume={8}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84938671555&partnerID=MN8TOARS}, booktitle={86th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2013}, author={Yousefelahiyeh, R. and Dominic, C.C.S. and Ducoste, J.}, year={2013}, pages={5063–5068} }
 @inproceedings{wang_hossen_aziz_ducoste_bullard_de los reyes_2013, title={Developing Resilient Anaerobic Co-digesting Microbial Communities}, volume={2}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85070513853&partnerID=MN8TOARS}, booktitle={86th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2013}, author={Wang, L. and Hossen, E.H. and Aziz, T.N. and Ducoste, J. and Bullard, M. and De Los Reyes, F.L.}, year={2013}, pages={764–770} }
 @inproceedings{jenny_simmons_ducoste_2013, title={Experimental and Numerical Evaluation of a UV-LED Point of Use Disinfection Device}, author={Jenny, R.M. and Simmons, O.D. and Ducoste, J.}, year={2013}, month={Nov} }
 @article{he_reyes_leming_dean_lappi_ducoste_2013, title={Mechanisms of Fat, Oil and Grease (FOG) deposit formation in sewer lines}, volume={47}, ISSN={["0043-1354"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84879016648&partnerID=MN8TOARS}, DOI={10.1016/j.watres.2013.05.002}, abstractNote={FOG deposits in sewer systems have recently been shown to be metallic salts of fatty acids. However, the fate and transport of FOG deposit reactant constituents and the complex interactions during the FOG deposit formation process are still largely unknown. In this study, batch tests were performed to elucidate the mechanisms of FOG deposit formation that lead to sanitary sewer overflows (SSOs). We report the first formation of FOG deposits on a concrete surface under laboratory conditions that mimic the formation of deposits in sewer systems. Results showed that calcium, the dominant metal in FOG deposits, can be released from concrete surfaces under low pH conditions and contribute to the formation process. Small amounts of additional oil to grease interceptor effluent substantially facilitated the air/water or pipe surface/water interfacial reaction between free fatty acids and calcium to produce surface FOG deposits. Tests of different fatty acids revealed that more viscous FOG deposit solids were formed on concrete surfaces, and concrete corrosion was accelerated, in the presence of unsaturated FFAs versus saturated FFAs. Based on all the data, a comprehensive model was proposed for the mechanisms of FOG deposit formation in sewer systems.}, number={13}, journal={WATER RESEARCH}, publisher={Elsevier BV}, author={He, Xia and Reyes, Francis L., III and Leming, Michael L. and Dean, Lisa O. and Lappi, Simon E. and Ducoste, Joel J.}, year={2013}, month={Sep}, pages={4451–4459} }
 @article{chen_song_williams_shuford_liu_wang_li_shi_gokce_ducoste_et al._2013, title={Monolignol Pathway 4-Coumaric Acid: Coenzyme A Ligases in Populus trichocarpa: Novel Specificity, Metabolic Regulation, and Simulation of Coenzyme A Ligation Fluxes}, volume={161}, ISSN={["0032-0889"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84874626790&partnerID=MN8TOARS}, DOI={10.1104/pp.112.210971}, abstractNote={Abstract}, number={3}, journal={PLANT PHYSIOLOGY}, author={Chen, Hsi-Chuan and Song, Jina and Williams, Cranos M. and Shuford, Christopher M. and Liu, Jie and Wang, Jack P. and Li, Quanzi and Shi, Rui and Gokce, Emine and Ducoste, Joel and et al.}, year={2013}, month={Mar}, pages={1501–1516} }
 @misc{ducoste_2013, title={New Tools to Assess the Potential Risk of FOG deposit Accumulation in a Wastewater Collection System}, author={Ducoste, J.J.}, year={2013} }
 @inproceedings{iasmin_ducoste_2013, title={Quantifying Fat, Oil, and Grease (FOG) Deposits Formation Kinetics in Sewer Collection System}, author={Iasmin, M. and Ducoste, J.}, year={2013}, month={Nov} }
 @inproceedings{yousefelahiyeh_dominic_ducoste_2013, title={Simulating the Formation of Fats, Oils, and Grease (FOG) Deposits in a Sewer Collection System}, author={Yousefelahiyeh, R. and Dominic, C.C.S. and Ducoste, J.}, year={2013} }
 @article{dominic_szakasits_dean_ducoste_2013, title={Understanding the spatial formation and accumulation of fats, oils and grease deposits in the sewer collection system}, volume={68}, ISSN={["1996-9732"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84888247504&partnerID=MN8TOARS}, DOI={10.2166/wst.2013.428}, abstractNote={Sanitary sewer overflows are caused by the accumulation of insoluble calcium salts of fatty acids, which are formed by the reaction between fats, oils and grease (FOG) and calcium found in wastewaters. Different sewer structural configurations (i.e., manholes, pipes, wet wells), which vary spatially, along with other obstructions (roots intrusion) and pipe deformations (pipe sags), may influence the detrimental buildup of FOG deposits. The purpose of this study was to quantify the spatial variation in FOG deposit formation and accumulation in a pilot-scale sewer collection system. The pilot system contained straight pipes, manholes, roots intrusion, and a pipe sag. Calcium and oil were injected into the system and operated at alkaline (pH = 10) and neutral (pH = 7) pH conditions. Results showed that solid accumulations were slightly higher at neutral pH. Fourier transform infrared (FTIR) analysis on the solids samples confirmed that the solids were indeed calcium-based fatty acid salts. However, the fatty acid profiles of the solids deviated from the profile found from FOG deposits in sewer systems, which were primarily saturated fatty acids. These results confirm the work done previously by researchers and suggest an alternative fate of unsaturated fatty acids that does not lead to their incorporation in FOG deposits in full-scale sewer systems.}, number={8}, journal={WATER SCIENCE AND TECHNOLOGY}, author={Dominic, Christopher Cyril Sandeep and Szakasits, Megan and Dean, Lisa O. and Ducoste, Joel J.}, year={2013}, pages={1830–1836} }
 @inproceedings{he_ducoste_de los reyes_2012, title={A Comprehensive Mechanistic Model Showing How Fat, Oil, and Grease (FOG) Deposits Form in Sewer Lines,}, author={He, X. and Ducoste, J. and de los Reyes, F.}, year={2012} }
 @inproceedings{karami_de los reyes_ducoste_2012, title={Aerobic granulation can be induced by shear variability}, volume={11}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85070471689&partnerID=MN8TOARS}, booktitle={WEFTEC 2012 - 85th Annual Technical Exhibition and Conference}, author={Karami, B. and De Los Reyes, F.L. and Ducoste, J.J.}, year={2012}, pages={6921–6926} }
 @article{long_aziz_reyes_ducoste_2012, title={Anaerobic co-digestion of fat, oil, and grease (FOG): A review of gas production and process limitations}, volume={90}, ISSN={["1744-3598"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84860766076&partnerID=MN8TOARS}, DOI={10.1016/j.psep.2011.10.001}, abstractNote={The addition of readily available high strength organic wastes such as fats, oils, and grease (FOG) from restaurant grease abatement devices may substantially increase biogas production from anaerobic digesters at wastewater treatment facilities. This FOG addition may provide greater economic incentives for the use of excess biogas to generate electricity, thermal, or mechanical energy. Co-digestion of FOG with municipal biosolids at a rate of 10–30% FOG by volume of total digester feed caused a 30–80% increase in digester gas production in two full scale wastewater biosolids anaerobic digesters (Bailey, 2007, Muller et al., 2010). Laboratory and pilot scale anaerobic digesters have shown even larger increases in gas production. However, anaerobic digestion of high lipid wastes has been reported to cause inhibition of acetoclastic and methanogenic bacteria, substrate, and product transport limitation, sludge flotation, digester foaming, blockages of pipes and pumps, and clogging of gas collection and handling systems. This paper reviews the scientific literature on biogas production, inhibition, and optimal reactor configurations, and will highlight future research needed to improve the gas production and overall efficiency of anaerobic co-digestion of FOG with biosolids from municipal wastewater treatment.}, number={3}, journal={PROCESS SAFETY AND ENVIRONMENTAL PROTECTION}, publisher={Elsevier BV}, author={Long, J. Hunter and Aziz, Tarek N. and Reyes, Francis L., III and Ducoste, Joel J.}, year={2012}, month={May}, pages={231–245} }
 @inproceedings{wang_aziz_ducoste_de los reyes_2012, title={Anaerobic co-digestion of grease trap waste}, volume={9}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85070451883&partnerID=MN8TOARS}, booktitle={WEFTEC 2012 - 85th Annual Technical Exhibition and Conference}, author={Wang, L. and Aziz, T.N. and Ducoste, J. and De Los Reyes, F.L.}, year={2012}, pages={5428–5434} }
 @misc{wang_ducoste_2012, title={Challenges in the Measurements of Fat, Oil and Grease in Food Service Establishment Waste Streams}, author={Wang, Y. and Ducoste, J.}, year={2012} }
 @misc{ducoste_2012, title={Chemical and Hydraulic Factors that influence the formation of FOG Deposits in Sewer Collection Systems}, author={Ducoste, J.J.}, year={2012} }
 @misc{aziz_long_wang_de los reyes_ducoste_2012, title={Exploring Sustainable Energy from Grease Interceptor Waste}, author={Aziz, T.N. and Long, J.H. and Wang, L. and de los Reyes, F.L. and Ducoste, J.J.}, year={2012} }
 @misc{iasmin_ducoste_2012, title={Factors that Influence the Physical and Chemical Characteristics of Fat, Oil, and Grease Deposits in Sewer Systems}, author={Iasmin, M. and Ducoste, J.}, year={2012} }
 @misc{ducoste_2012, title={Fat, Oil, and Grease (FOG) in Sanitary Sewer Systems: Factors that influence Deposit formation}, author={Ducoste, J.J.}, year={2012} }
 @article{aziz_holt_keener_groninger_ducoste_2012, title={Field Characterization of External Grease Abatement Devices}, volume={84}, ISSN={["1061-4303"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84863195556&partnerID=MN8TOARS}, DOI={10.2175/106143012x13347678384161}, abstractNote={This study characterized some of the physical and chemical features of large outside field grease abatement devices (GADs). 24‐hour measurements of several food service establishments' (FSEs') influent GAD flowrates indicated highly intermittent conditions with hydraulic retention times (HRTs) that exceeded the common recommendation (30 minutes) by two to five times. Investigation into the chemical characteristics of GADs indicated highly variable influent and effluent fat, oil, and grease (FOG) concentrations. Low pH and dissolved oxygen values were measured throughout the GAD, indicating the likely occurrence of anaerobic microbial processes. Detailed spatial and temporal observations of the accumulation of FOG and food solids were also discussed. Though the FOG layer remained relatively constant for all GAD configurations investigated, results indicated that commonly‐used GAD configurations with a straight submerged inlet tee or no‐inlet tee configuration may result in the transport of food solids into the second compartment. The present research showed increased accumulation of food solids in the first compartment with a retro‐fit flow distributive inlet. This retro‐fit displays promise for potentially improving the separation characteristics of existing GADs.}, number={3}, journal={WATER ENVIRONMENT RESEARCH}, author={Aziz, Tarek N. and Holt, Leon M. and Keener, Kevin M. and Groninger, John W. and Ducoste, Joel J.}, year={2012}, month={Mar}, pages={237–246} }
 @misc{he_de los reyes_ducoste_2012, title={How do Fat, Oil, and Grease Deposits form in Sewer Lines}, author={He, X. and de los Reyes, F.L. and Ducoste, J.}, year={2012} }
 @inproceedings{long_ducoste_aziz_2012, title={Life cycle assessment of grease trap waste co-digestion, land application, and composting}, volume={9}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85070471442&partnerID=MN8TOARS}, booktitle={WEFTEC 2012 - 85th Annual Technical Exhibition and Conference}, author={Long, J.H. and Ducoste, J.J. and Aziz, T.N.}, year={2012}, pages={5413–5418} }
 @misc{song_chen_shuford_li_shi_muddiman_williams_ducoste_sederoff_chiang_2012, title={Mechanistic Modeling Frameworks for Multiple Enzyme Regulation in Metabolic Pathway}, author={Song, J. and Chen, H. and Shuford, C.M. and Li, Q. and Shi, R. and Muddiman, D.C. and Williams, C.M. and Ducoste, J. and Sederoff, R.R. and Chiang, V.L.}, year={2012} }
 @misc{ducoste_2012, title={Modeling Advance Oxidation Processes for Optimizing Reactor Performance}, author={Ducoste, J.J.}, year={2012} }
 @misc{ducoste_2012, title={Modeling the removal of EDC chemicals using Advance Oxidation}, author={Ducoste, J.J.}, year={2012} }
 @misc{ducoste_2012, title={Numerical Approach to Modeling UV Disinfection Processes: A State of the Art Review}, author={Ducoste, J.J.}, year={2012} }
 @misc{willliams_chen_song_ducoste_shuford_li_liu_shi_muddiman_sederoff_et al._2012, title={Predictive Models of Regulatory and Metabolic Pathways for Monolignol Biosynthesis in Populus trichocarpa}, author={Willliams, C.M. and Chen, H. and Song, J. and Ducoste, J. and Shuford, C.M. and Li, Q. and Liu, J. and Shi, R. and Muddiman, D.C. and Sederoff, R.R. and et al.}, year={2012} }
 @misc{*aziz_wang_long_ducoste_de los reyes_2012, title={Sustainable Energy from Grease Interceptor Waste Co-Digestion}, author={*Aziz, T.N. and Wang, L. and Long, J.H. and Ducoste, J.J. and de los Reyes, F.L., III}, year={2012} }
 @article{bowker_alpert_shatalov_ducoste_2012, title={UV LEDs for Water Disinfection}, volume={14}, number={2}, journal={International Ultraviolet Association News}, author={Bowker, C. and Alpert, S. and Shatalov, M. and Ducoste, J.}, year={2012}, pages={20–27} }
 @inproceedings{dominic_szakasits_ducoste_2012, title={Understanding the spatial formation and accumulation of fats, oils and grease deposits in the sewer collection system}, volume={13}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85070546837&partnerID=MN8TOARS}, booktitle={WEFTEC 2012 - 85th Annual Technical Exhibition and Conference}, author={Dominic, C.C.S. and Szakasits, M. and Ducoste, J.}, year={2012}, pages={7989–7994} }
 @misc{ducoste_2012, title={Using Computational Fluid Dynamics Modeling to guide design decisions}, author={Ducoste, J.J.}, year={2012} }
 @inproceedings{ducoste_2012, title={Using computational fluid dynamics modeling to help inform assessment of low wavelength inactivation}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84871568794&partnerID=MN8TOARS}, booktitle={American Water Works Association Annual Conference and Exposition 2012, ACE 2012}, author={Ducoste, J.}, year={2012}, pages={6437–6451} }
 @inproceedings{ducoste_alpert_2011, title={Assessing the UV Dose Delivered from Two UV Reactors in Series: Can you always assume doubling the UV dose from individual reactor validations?}, author={Ducoste, J.J. and Alpert}, year={2011} }
 @article{gallimore_aziz_movahed_ducoste_2011, title={Assessment of Internal and External Grease Interceptor Performance for Removal of Food-Based Fats, Oil, and Grease from Food Service Establishments}, volume={83}, ISSN={1061-4303}, url={http://dx.doi.org/10.2175/106143011x12989211840972}, DOI={10.2175/106143011X12989211840972}, abstractNote={A research study was performed to determine the fats, oil, and grease (FOG) removal efficiency of internal flow‐based grease interceptors (FGI). A passive‐flow and a mechanical‐flow FGI unit were tested and their performance was compared to an external retention‐based grease interceptor (RGI). Experiments involved multiple parameters including three oil/water emulsion strengths, two influent liquid temperatures, and two flow rates. Overall, the RGI achieved approximately 80% FOG removal and the FGIs removed less than 50% under the tested conditions. One exception occurred during the passive FGI testing during which removal reached approximately 80%. This increased efficiency was likely due to the relatively weak emulsion exhibiting significantly large FOG globules. The FOG removal efficiency decreased with increased temperature because of increased breakage of FOG globules at the elevated temperature. These results suggest that emulsion strength significantly affects FOG removal efficiency of FGIs and should be considered in future manufacturer testing protocol.}, number={9}, journal={Water Environment Research}, publisher={Wiley}, author={Gallimore, Erin and Aziz, Tarek N. and Movahed, Zohreh and Ducoste, Joel}, year={2011}, month={Sep}, pages={882–892} }
 @article{hubbe_hasan_ducoste_2011, title={Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review 1. Metals}, volume={6}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79953742160&partnerID=MN8TOARS}, number={2}, journal={Bioresources}, author={Hubbe, M.A. and Hasan, S.H. and Ducoste, J.J.}, year={2011}, pages={2161–2287} }
 @inproceedings{sobremisana_ducoste_de los reyes_2011, title={Combining CFD, FLOC Dynamics, and Biological Reaction Kinetics to Model Carbon and Nitrogen Removal in an Activated Sludge System}, volume={2011}, ISSN={1938-6478}, url={http://dx.doi.org/10.2175/193864711802721569}, DOI={10.2175/193864711802721569}, abstractNote={Combining CFD, FLOC Dynamics, and Biological Reaction Kinetics to Model Carbon and Nitrogen Removal in an Activated Sludge SystemA number of studies have been performed in the simulation of activated sludge systems with many utilizing ideal reactor concepts to reduce the overall complexity of the model framework. Observance of non-ideal behaviour in actual reactors, however, led others to recognize the importance of hydrodynamics in modelling wastewater treatment processes. More recently, new experimental studies have...Author(s)A. P. SobremisanaJ. J. DucosteF. L. de los ReyesSourceProceedings of the Water Environment FederationSubjectSession 54: Advanced Process ModelingDocument typeConference PaperPublisherWater Environment FederationPrint publication date Jan, 2011ISSN1938-6478SICI1938-6478(20110101)2011:13L.3272;1-DOI10.2175/193864711802721569Volume / Issue2011 / 13Content sourceWEFTECFirst / last page(s)3272 - 3282Copyright2011Word count240Subject keywordsactivated sludgeQMOMCFDASM1}, number={13}, booktitle={Proceedings of the Water Environment Federation}, publisher={Water Environment Federation}, author={Sobremisana, A. P. and Ducoste, J. J. and de los Reyes, F. L.}, year={2011}, month={Jan}, pages={3272–3282} }
 @misc{sobriminsana_ducoste_de los reyes_2011, title={Combining CFD, floc dynamics, and biological reaction kinetics to model carbon and nitrogen removal in an activated sludge system}, author={Sobriminsana, A and Ducoste, J. and de los Reyes, F.L.}, year={2011} }
 @article{he_iasmin_dean_lappi_ducoste_reyes_2011, title={Evidence for Fat, Oil, and Grease (FOG) Deposit Formation Mechanisms in Sewer Lines}, volume={45}, ISSN={["1520-5851"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79956022597&partnerID=MN8TOARS}, DOI={10.1021/es2001997}, abstractNote={The presence of hardened and insoluble fats, oil, and grease (FOG) deposits in sewer lines is a major cause of line blockages leading to sanitary sewer overflows (SSOs). Despite the central role that FOG deposits play in SSOs, little is known about the mechanisms of FOG deposit formation in sanitary sewers. In this study, FOG deposits were formed under laboratory conditions from the reaction between free fatty acids and calcium chloride. The calcium and fatty acid profile analysis showed that the laboratory-produced FOG deposit displayed similar characteristics to FOG deposits collected from sanitary sewer lines. Results of FTIR analysis showed that the FOG deposits are metallic salts of fatty acid as revealed by comparisons with FOG deposits collected from sewer lines and pure calcium soaps. Based on the data, we propose that the formation of FOG deposits occurs from the aggregation of excess calcium compressing the double layer of free fatty acid micelles and a saponification reaction between aggregated calcium and free fatty acids.}, number={10}, journal={ENVIRONMENTAL SCIENCE & TECHNOLOGY}, author={He, Xia and Iasmin, Mahbuba and Dean, Lisa O. and Lappi, Simon E. and Ducoste, Joel J. and Reyes, Francis L., III}, year={2011}, month={May}, pages={4385–4391} }
 @misc{ducoste_2011, title={Fat, Roots, Oil, and Grease (FROG) in Sanitary Sewer Systems: Is a Sustainable Sewer system in Jeopardy}, author={Ducoste, J.J.}, year={2011} }
 @article{he_ducoste_de los reyes_2011, title={How are Fat, Oil and Grease (FOG) Deposits Formed in Sewer Lines?}, author={He, X. and Ducoste, J. and de los Reyes, F.L.}, year={2011} }
 @article{bowker_sain_shatalov_ducoste_2011, title={Microbial UV fluence-response assessment using a novel UV-LED collimated beam system}, volume={45}, ISSN={["0043-1354"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79951581235&partnerID=MN8TOARS}, DOI={10.1016/j.watres.2010.12.005}, abstractNote={A research study has been performed to determine the ultraviolet (UV) fluence-response of several target non-pathogenic microorganisms to UV light emitting diodes (UV-LEDs) by performing collimated beam tests. UV-LEDs do not contain toxic mercury, offer design flexibility due to their small size, and have a longer operational life than mercury lamps. Comsol Multiphysics was utilized to create an optimal UV-LED collimated beam design based on number and spacing of UV-LEDs and distance of the sample from the light source while minimizing the overall cost. The optimized UV-LED collimated beam apparatus and a low-pressure mercury lamp collimated beam apparatus were used to determine the UV fluence-response of three surrogate microorganisms (Escherichia coli, MS-2, T7) to 255 nm UV-LEDs, 275 nm UV-LEDs, and 254 nm low-pressure mercury lamps. Irradiation by low-pressure mercury lamps produced greater E. coli and MS-2 inactivation than 255 nm and 275 nm UV-LEDs and similar T7 inactivation to irradiation by 275 nm UV-LEDs. The 275 nm UV-LEDs produced more efficient T7 and E. coli inactivation than 255 nm UV-LEDs while both 255 nm and 275 nm UV-LEDs produced comparable microbial inactivation for MS-2. Differences may have been caused by a departure from the time-dose reciprocity law due to microbial repair mechanisms.}, number={5}, journal={WATER RESEARCH}, author={Bowker, Colleen and Sain, Amanda and Shatalov, Max and Ducoste, Joel}, year={2011}, month={Feb}, pages={2011–2019} }
 @misc{arafin_ducoste_2011, title={Modeling and experimental Evaluation of UV LED Reactor using Computational Fluid Dynamics}, author={Arafin, M. and Ducoste, J.}, year={2011} }
 @inproceedings{arafin_ducoste_2011, title={Modeling of a Flow Through UV LED Reactor using Computational Fluid Dynamics}, author={Arafin, M. and Ducoste, J.}, year={2011} }
 @article{vallabh_ducoste_seyam_banks-leel_2011, title={Modeling tortuosity in thin fibrous porous media using computational fluid dynamics}, volume={14}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-80053462291&partnerID=MN8TOARS}, DOI={10.1615/jpormedia.v14.i9.40}, abstractNote={VALLABH, RAHUL. Modeling Tortuosity in Fibrous Porous Media using Computational Fluid Dynamics. (Under the direction of Dr. Pamela Banks-Lee and Dr. Abdel-Fattah Seyam). Tortuosity factor is often used to characterize the structure of the pore volume in fibrous porous media. This work involves the determination of tortuosity using computational fluid dynamic (CFD) simulation and particle tracking analysis. A new method has been adopted to generate 3-D geometry for modeling fibrous porous structures using ANSYS Parametric Design Language (APDL). Computation fluid dynamics has been used to simulate permeability of modeled 3-D fiberweb structures. The simulated permeability results are in good agreement with the models proposed by other authors. The experimental results were found to be slightly higher compared to simulated results and existing models due to the layered configuration of the samples. Permeability is found to be significantly influenced by fiber diameter, and porosity as well as fiberweb thickness. The relationship between air permeability and fiberweb thickness has been used to develop an indirect method for determination of tortuosity factor. Tortuosity factor has also been determined using a more direct method involving CFD simulation and Particle Tracking analysis. Different models established using the direct and indirect methods of determination show that tortuosity is significantly influenced by porosity, fiber diameter and fiberweb thickness, whereas the models available in the literature express tortuosity as a function of porosity only. Modeling Tortuosity in Fibrous Porous Media using Computational Fluid Dynamics}, number={9}, journal={Journal of Porous Media}, author={Vallabh, R. and Ducoste, J. and Seyam, Abdel-Fattah and Banks-Leel, P.}, year={2011}, pages={791–804} }
 @inproceedings{bowker_ducoste_2011, title={Numerical and experimental evaluation of UV light emitting diodes for drinking water disinfection}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84871634276&partnerID=MN8TOARS}, booktitle={American Water Works Association Annual Conference and Exposition 2011, ACE 2011}, author={Bowker, C. and Ducoste, J.}, year={2011}, pages={5666–5696} }
 @article{olukanni_ducoste_2011, title={Optimization of waste stabilization pond design for developing nations using computational fluid dynamics}, volume={37}, ISSN={["1872-6992"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-80052089907&partnerID=MN8TOARS}, DOI={10.1016/j.ecoleng.2011.06.003}, abstractNote={Waste stabilization ponds (WSPs) have been used extensively to provide wastewater treatment throughout the world. However, no rigorous assessment of WSPs that account for cost in addition to hydrodynamics and treatment efficiency has been performed. A study was conducted that utilized computational fluid dynamics (CFD) coupled with an optimization program to optimize the selection of the best WSP configuration based on cost and treatment efficiency. The results of monitoring the fecal coliform concentration at the reactor outlet showed that the conventional 70% pond-width baffle pond design is not consistently the best pond configuration as previously reported in the literature. The target effluent log reduction can be achieved by reducing the amount of construction material and tolerating some degree of fluid mixing within the pond. As expected, the multi-objective genetic algorithm optimization did produce a lower-cost WSP design compared to a SIMPLEX optimization algorithm, however, with only a marginal increase in the effluent microbial log reduction. Several other designs generated by the CFD/optimization model showed that both shorter and longer baffles, alternative depths, and reactor length to width ratios could improve the hydraulic efficiency of the ponds at a reduced overall construction cost.}, number={11}, journal={ECOLOGICAL ENGINEERING}, author={Olukanni, David O. and Ducoste, Joel J.}, year={2011}, month={Nov}, pages={1878–1888} }
 @article{aziz_holt_keener_groninger_ducoste_2011, title={Performance of Grease Abatement Devices for Removal of Fat, Oil, and Grease}, volume={137}, ISSN={["0733-9372"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-78650316471&partnerID=MN8TOARS}, DOI={10.1061/(asce)ee.1943-7870.0000295}, abstractNote={This study assessed the performance of a conventional grease abatement device and the impact of internal geometry modifications on fat, oil, and grease (FOG) removal efficiency. Analysis was performed using experimental results and computational fluid dynamics (CFD) on alternative inlet, outlet, and baffle wall designs. Numerical and experimental results indicated that the conventional two-compartment design leads to substantial FOG short circuiting when operated at a 20-min hydraulic retention time (HRT). Alterations to the inlet configuration and baffle wall arrangement yielded FOG removal enhancements with the 20-min HRT that approached removal performance levels obtained with the standard configurations at the 1-h HRT. CFD simulations effectively reproduced performance trends observed on the lab-scale with the exception of simulations using a distributive inlet tee, where CFD over predicted the removal performance.}, number={1}, journal={JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE}, author={Aziz, Tarek N. and Holt, Leon M. and Keener, Kevin M. and Groninger, John W. and Ducoste, Joel J.}, year={2011}, month={Jan}, pages={84–92} }
 @misc{karami_de los reyes_ducoste_2011, title={Studying Formation of Nitrifying Aerobic Granules and Effect of Shear Distribution on Granulation}, author={Karami, B. and de los Reyes, F. and Ducoste, J.}, year={2011} }
 @inproceedings{alpert_bowker_ducoste_2011, title={UV-LEDs for Water Disinfection – Are We Close?}, author={Alpert, S. and Bowker, C. and Ducoste, J.J.}, year={2011} }
 @misc{ducoste_2011, title={Velocity Profiles and their Relevance in UV Reactor Validation}, author={Ducoste, J.J.}, year={2011} }
 @misc{ducoste_2011, title={Water and Waster Treatment Process on Steriods: Using Computational Fluid Dynamics to Drive out Unit Process Inefficiencies}, author={Ducoste, J.}, year={2011} }
 @inproceedings{sobriminsana_ducoste_de los reyes_2010, title={A Numerical Approach for Modeling Carbon and Nitrogen Removal Under the Influence of Floc Size Distribution}, author={Sobriminsana, A. and Ducoste, J. and de los Reyes, F.L.}, year={2010} }
 @inproceedings{gallimore_ducoste_2010, title={Assessment of Grease Abatement Systems}, author={Gallimore, Aziz and Ducoste, J.J.}, year={2010} }
 @misc{ducoste_2010, title={Can CFD Answer Hydraulic Questions and make Validation more broadly applicable?}, author={Ducoste, J.J.}, year={2010} }
 @book{ducoste_knappe_alpert_2010, place={Denver, CO}, title={Evaluation of Computational Fluid Dynamics (CFD) for Modeling UV Initiated Advance Oxidation Processes}, institution={Water Research Foundation}, author={Ducoste, J.J. and Knappe, D. and Alpert, S.}, year={2010} }
 @misc{de los reyes_ducoste_2010, title={Factors Affecting the Formation of FOG Deposits in Sewer Lines}, author={de los Reyes, F. and Ducoste, J.}, year={2010} }
 @misc{ducoste_2010, title={Fat, Roots, Oil, and Grease (FROG) in Sanitary Sewer Systems: Is a Sustainable Sewer system in Jeopardy}, author={Ducoste, J.J.}, year={2010} }
 @misc{ducoste_2010, title={Fats Roots Oil and Grease in US Sewer Systems: An overview}, author={Ducoste, J.J.}, year={2010} }
 @inproceedings{aziz_holt_keener_ducoste_2010, title={Field Assessment of Grease Abatement Devices}, volume={2010}, ISSN={1938-6478}, url={http://dx.doi.org/10.2175/193864710798170982}, DOI={10.2175/193864710798170982}, number={14}, booktitle={Proceedings of the Water Environment Federation}, publisher={Water Environment Federation}, author={Aziz, Tarek N. and Holt, Leon and Keener, Kevin M. and Ducoste, Joel J.}, year={2010}, month={Jan}, pages={2916–2917} }
 @misc{ducoste_2010, title={Grease Interceptors vs Under the Sink Grease Traps: Who won the Taste Test of Removing influent Fats, Oils, and Grease}, author={Ducoste, J.J.}, year={2010} }
 @misc{he_ducoste_de los reyes_2010, title={Investigating the Formation of Fat Oil and Grease Deposits in Sewer Collection Systems}, author={He, Xia and Ducoste, J.J. and de los Reyes, F. L.}, year={2010} }
 @article{santoro_raisee_moghaddami_ducoste_sasges_liberti_notarnicola_2010, title={Modeling Hydroxyl Radical Distribution and Trialkyl Phosphates Oxidation in UV-H2O2 Photoreactors Using Computational Fluid Dynamics}, volume={44}, ISSN={["0013-936X"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77956533355&partnerID=MN8TOARS}, DOI={10.1021/es1000962}, abstractNote={Advanced Oxidation Processes (AOPs) promoted by ultraviolet light are innovative and potentially cost-effective solutions for treating persistent pollutants recalcitrant to conventional water and wastewater treatment. While several studies have been performed during the past decade to improve the fundamental understanding of the UV-H(2)O(2) AOP and its kinetic modeling, Computational Fluid Dynamics (CFD) has only recently emerged as a powerful tool that allows a deeper understanding of complex photochemical processes in environmental and reactor engineering applications. In this paper, a comprehensive kinetic model of UV-H(2)O(2) AOP was coupled with the Reynolds averaged Navier-Stokes (RANS) equations using CFD to predict the oxidation of tributyl phosphate (TBP) and tri(2-chloroethtyl) phosphate (TCEP) in two different photoreactors: a parallel- and a cross-flow UV device employing a UV lamp emitting primarily 253.7 nm radiation. CFD simulations, obtained for both turbulent and laminar flow regimes and compared with experimental data over a wide range of UV doses, enabled the spatial visualization of hydrogen peroxide and hydroxyl radical distributions in the photoreactor. The annular photoreactor displayed consistently better oxidation performance than the cross-flow system due to the absence of recirculation zones, as confirmed by the hydroxyl radical dose distributions. Notably, such discrepancy was found to be strongly dependent on and directly correlated with the hydroxyl radical rate constant becoming relevant for conditions approaching diffusion-controlled reaction regimes (k(C,OH) > 10(9) M(-1) s(-1)).}, number={16}, journal={ENVIRONMENTAL SCIENCE & TECHNOLOGY}, author={Santoro, Domenico and Raisee, Mehrdad and Moghaddami, Mostafa and Ducoste, Joel and Sasges, Micheal and Liberti, Lorenzo and Notarnicola, Michele}, year={2010}, month={Aug}, pages={6233–6241} }
 @article{alpert_knappe_ducoste_2010, title={Modeling the UV/hydrogen peroxide advanced oxidation process using computational fluid dynamics}, volume={44}, ISSN={["0043-1354"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77149163483&partnerID=MN8TOARS}, DOI={10.1016/j.watres.2009.12.003}, abstractNote={The use of numerical models for the design and optimization of UV/H2O2 systems must incorporate both reactor design (hydrodynamics, lamp orientation) and chemical kinetics (reaction mechanisms, kinetic rate constants). This study was conducted to evaluate the performance of comprehensive CFD/UV/AOP models for the degradation of an indicator organic contaminant. The combination of turbulence sub-models, fluence rate sub-models, and kinetic rate equations resulted in a comprehensive and flexible design tool for predicting the effluent chemical composition from a UV-initiated AOP reactor. The CFD model tended to under predict the percent removal of methylene blue compared to pilot reactor trials under the same operating conditions. In addition, the percent difference between the pilot and the CFD results increased with increasing flow rates. The MSSS fluence rate sub-model predicted higher contaminant removal values than the RAD-LSI sub-model while the different two-equation turbulence sub-models did not significantly impact the predicted removal for methylene blue in the tested reactor configuration. The overall degradation of methylene blue was a strong function of the second-order kinetic rate constant describing the reaction between methylene blue and the hydroxyl radical. In addition, the removal of methylene blue was sensitive to the concentration of dissolved organic carbon in the water matrix since DOC acts as a scavenger of hydroxyl radicals.}, number={6}, journal={WATER RESEARCH}, author={Alpert, Scott M. and Knappe, Detlef R. U. and Ducoste, Joel J.}, year={2010}, month={Mar}, pages={1797–1808} }
 @misc{williams_ducoste_song_isik_sederoff_chiang_2010, place={Center, NCSU}, title={Predicting regulatory control of lignin biosynthesis using signaling graph methodology}, author={Williams, Cranos and Ducoste, Joel and Song, Jina and Isik, Fikret and Sederoff, Ron and Chiang, Vincent}, year={2010} }
 @misc{ducoste_williams_song_chen_isik_sederoff_chiang_2010, title={Regulatory constrained flux balance analysis of monolignol biosynthesis}, author={Ducoste, Joel and Williams, Cranos and Song, Jina and Chen, His-Chuan and Isik, Fikret and Sederoff, Ron and Chiang, Vincent}, year={2010} }
 @misc{ducoste_2010, title={Simulating the UV/H2O2 Advanced Oxidation Process using Computational Fluid Dynamics}, author={Ducoste, J.J.}, year={2010} }
 @inproceedings{alpert_jin_aziz_ducoste_2010, title={The Value of Numerical Modeling in the Design and Operation of Drinking Water Treatment Processes}, author={Alpert, S.M. and Jin, S. and Aziz, T. and Ducoste, J.}, year={2010} }
 @inproceedings{vallabh_seyam_banks-lee_ducoste_2010, title={Tortuosity in Fibrous Porous Media}, booktitle={Proceedings of the 7th International Conference of Textile Research Division}, author={Vallabh, R. and Seyam, A.M. and Banks-Lee, P. and Ducoste, J.}, year={2010} }
 @inproceedings{vallabh_seyam_banks-lee_ducoste_2010, title={Tortuosity of Nonwoven Structures}, booktitle={Proceedings of the 7th International Conference of Textile Research Division}, author={Vallabh, R. and Seyam, A.M. and Banks-Lee, P. and Ducoste, J.}, year={2010} }
 @inproceedings{alpert_ducoste_2009, title={A CFD modeling protocol for simulating the UV/H<inf>2</inf>O<inf>2</inf> advanced oxidation process}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84873492275&partnerID=MN8TOARS}, booktitle={Water Quality Technology Conference and Exposition 2009}, author={Alpert, S.M. and Ducoste, J.J.}, year={2009}, pages={1795–1816} }
 @book{nopens_ducoste_briesen_2009, title={Advances in Population Balance Modeling}, volume={64}, journal={Chemical Engineering Science}, year={2009} }
 @misc{ducoste_2009, title={Analysis of Fat, Oil, and Grease (FOG) in Sanitary Sewer Systems: Challenges to a Sustainable system}, author={Ducoste, J.J.}, year={2009} }
 @misc{ducoste_2009, title={Analysis of Field Grease Interceptors}, author={Ducoste, J.J.}, year={2009} }
 @article{zhao_alpert_ducoste_2009, title={Assessing the Impact of Upstream Hydraulics on the Dose Distribution of Ultraviolet Reactors Using Fluorescence Microspheres and Computational Fluid Dynamics}, volume={26}, ISSN={["1557-9018"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-67249087634&partnerID=MN8TOARS}, DOI={10.1089/ees.2008.0139}, abstractNote={Abstract The ultraviolet (UV) dose distribution in an UV reactor was evaluated under multiple upstream configurations using UV-sensitive fluorescent microspheres and computational fluid dynamics (CFD). The upstream hydraulics configurations included two orientations of 90-degree bends and one straight pipe inlet. Experimental tests and numerical simulations were performed on a single-lamp low-pressure high-output (LPHO) UV reactor operating at a 50-gpm flow rate and 91% UV transmittance (UVT). Both the numerical and experimental results showed that the straight pipe configuration produced a shift in the UV dose distribution to a higher UV dose range compared to the two elbow configurations. The experimental UV dose distribution displayed no significant difference between the two elbow configurations while a slight difference in the location of the peak was noted between the two elbow configurations for the numerical model. Compared to the experimental results, the CFD model predicted slightly higher reduc...}, number={5}, journal={ENVIRONMENTAL ENGINEERING SCIENCE}, author={Zhao, Xi and Alpert, Scott M. and Ducoste, Joel J.}, year={2009}, month={May}, pages={947–959} }
 @misc{ducoste_2009, title={Assessment of Root Control Methods and Root Regrowth in a Pilot Scale Sanitary Sewer}, author={Ducoste, J.J.}, year={2009} }
 @misc{ducoste_2009, title={CFD Modeling for UV Disinfection and UV-Initiated Advanced Oxidation Processes}, author={Ducoste, J.J.}, year={2009} }
 @article{nopens_briesen_ducoste_2009, title={Celebrating a milestone in Population Balance Modeling}, volume={64}, ISSN={["0009-2509"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-58949087904&partnerID=MN8TOARS}, DOI={10.1016/j.ces.2009.01.004}, abstractNote={Crystallization is one of the most important unit operations used for the separation and purification of crystalline solid products. Appropriate design and control of the crystallization process is paramount to produce crystalline products with tailor-made-properties. This paper provides an overview of selected recent developments in the modelling, monitoring and control of crystallization processes. We consider the topics discussed in this review to be enabling technologies for the development of the next generation of crystallization processes with significantly improved predictability, robustness and controllability.}, number={4}, journal={CHEMICAL ENGINEERING SCIENCE}, author={Nopens, Ingmar and Briesen, Heiko and Ducoste, Joel}, year={2009}, month={Feb}, pages={627–627} }
 @misc{ducoste_2009, title={Computational Fluid Dynamics Modeling for Unit Process simulations in Drinking Water Treatment}, author={Ducoste, J.J.}, year={2009} }
 @article{ducoste_2009, place={Influents}, title={Computational Fluid Dynamics as an Integral Part of Water and Wastewater Treatment Process Design}, volume={4}, journal={Influents: Water Environment Association of Ontario}, publisher={Water Environment Association of Ontario}, author={Ducoste, J.J.}, year={2009}, pages={40–44} }
 @misc{de los reyes_ducoste_2009, title={Factors Affecting the Formation of FOG Deposits in Sewer Lines}, author={de los Reyes, F. and Ducoste, J.}, year={2009} }
 @misc{ducoste_2009, title={Population Balance Modeling in CFD Simulations}, author={Ducoste, J.J.}, year={2009} }
 @misc{ducoste_2009, title={Simulating Ultraviolet Advance Oxidation Processes in Continuous Flow UV Reactors}, author={Ducoste, J.J.}, year={2009} }
 @misc{sobremisana_de lose reyes_ducoste_2009, title={Simultaneous Modeling Carbon and Nitrogen Removal under the Influence of Floc Size Distribution}, author={Sobremisana, A. and de lose Reyes, F.L., III and Ducoste, J.J.}, year={2009} }
 @misc{ducoste_2009, title={The Intricacies of Analyzing/Designing Ultraviolet UV Disinfection Reactors using CFD}, author={Ducoste, J.J.}, year={2009} }
 @misc{alpert_ducoste_2009, title={Validation of CFD Models Simulating the UV/H2O2 Advanced Oxidation Process}, author={Alpert, S.M. and Ducoste, J.J.}, year={2009} }
 @misc{sobrimisana_reyes_ducoste_2008, title={A Numerical Approach for Modeling Carbon and Nitrogen Removal under the Influence of Floc Size Distribution}, author={Sobrimisana, A. and Reyes, F. and Ducoste, J.}, year={2008} }
 @misc{ducoste_2008, title={An Introduction to Population Balance Modeling}, author={Ducoste, J.J.}, year={2008} }
 @misc{ducoste_2008, title={An Overview of Computational Fluid Dynamics Modeling}, author={Ducoste, J.J.}, year={2008} }
 @misc{ducoste_2008, title={Analysis and Design of Grease Interceptors}, author={Ducoste, J.J.}, year={2008} }
 @misc{ducoste_2008, title={Analysis of FAT, Roots, Oil, and Grease (FROG) in Sanitary Sewers}, author={Ducoste, J.J.}, year={2008} }
 @misc{ducoste_2008, title={Analysis of FOG and Roots in Sewer Collection systems}, author={Ducoste, J.J.}, year={2008} }
 @misc{ducoste_2008, title={Analysis of Fat, Oil, and Grease Deposits in Sanitary Sewer Systems}, author={Ducoste, J.J.}, year={2008} }
 @misc{ducoste_2008, title={Analysis of Grease Interceptors for the Removal of FAT, Oil, and Grease (FOG): Are they Sufficient to Stop FOG related Sanitary Sewer Overflows}, author={Ducoste, J.J.}, year={2008} }
 @inproceedings{zhao_ducoste_2008, title={Analysis of a LPHO UV reactor under multiple upstream elbow configurations using UV sensitive fluorescent microspheres}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84871769914&partnerID=MN8TOARS}, booktitle={American Water Works Association - American Water Works Association Association Annual Conference and Exposition, ACE 2008}, author={Zhao, X. and Ducoste, J.}, year={2008}, pages={179–190} }
 @article{richards_ducoste_2008, title={Application of non-biological surrogates for analysis of sequential disinfection continuous flow systems}, volume={57}, ISSN={["0003-7214"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-45349093203&partnerID=MN8TOARS}, DOI={10.2166/aqua.2008.042}, abstractNote={ABSTRACT Brannon RichardsJoel Ducoste (corresponding author)Department of Civil, Construction, andEnvironmental Engineering,North Carolina State University,208 Mann Hall CB 7908,Raleigh, NC 27695-7908,USAE-mail: jducoste@eos.ncsu.edu Fluorescent YG-microspheres (Polysciences Inc.) were evaluated to simulate Cryptosporidiuminactivation in a continuous flow system that utilizes multiple disinfectants. Experiments wereperformed in a disinfection process consisting of an ozone primary stage and a secondary freechlorine stage. Impacts of the chemical disinfectant exposure were calculated by tracking thechanges in fluorescence distribution with a flow cytometer. Tests were performed at two flowrates (11- and 15.5-ml/s) and a target concentration-time (Ct) product of 1.4mg/L-min for ozoneand 510mg/L-min for chlorine. Analysis of the results suggest that the fluorescence decay ofYG-fluorescent microspheres does display synergistic effects when free chlorine is usedsequentially with ozone in a continuous flow system. The study also included the use of a simpleSegregated Flow Reactor (SFR) model to simulate the sequential disinfection process. The modelwas not effective at predicting fluorescent intensity changes at different intermediate pointswithin the disinfection process stream due to the complexity of the paths taken by themicrospheres through the ozone primary disinfectant chamber and its eventual influence onchlorine secondary disinfectant kinetics. An ozone Ct distribution, which utilized the fluorescencemicrospheres experimental data and was created from the range of paths traveled by themicrospheres, displayed a range of Ct values between 0.5 to 3.2mg/L-min for the low flowcondition and 0.8 to 2.2mg/l-min for the high flow condition. A new model structure wasproposed that may improve the simulation of sequential disinfection systems.}, number={4}, journal={JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA}, author={Richards, Brannon and Ducoste, Joel}, year={2008}, month={May}, pages={225–238} }
 @book{ducoste_keener_groninger_holt_2008, place={Alexandria, VA}, title={Assessment of Grease Interceptor Performance}, institution={Water Environment Research Foundation}, author={Ducoste, J.J. and Keener, K. and Groninger, J. and Holt, L.}, year={2008} }
 @misc{ducoste_aziz_buckley_movahed_card_gallimore_2008, title={Design Considerations for Volume Based Grease Interceptors}, author={Ducoste, J. and Aziz, T. and Buckley, T. and Movahed, Z. and Card, C. and Gallimore, E.}, year={2008} }
 @misc{ducoste_2008, title={FAT, Roots, Oil, and Grease (FROG) in Sanitary Sewers: Results from a Recent WERF Sponsored Study}, author={Ducoste, J.J.}, year={2008} }
 @book{ducoste_keener_groninger_holt_2008, place={Alexandria, VA}, title={FOG Interceptor Design and Operation (FOGIDO) Guidance Manual}, institution={Water Environment Research Foundation}, author={Ducoste, J.J. and Keener, K. and Groninger, J. and Holt, L.}, year={2008} }
 @book{ducoste_keener_groninger_holt_2008, title={Fats, Roots, Oil, and Grease (FROG)}, author={Ducoste, J.J. and Keener, K. and Groninger, J. and Holt, L.}, year={2008} }
 @inproceedings{hyunsuk_williams_hsieh_ducoste_de los reyes_2008, title={Floc Size Control and Microbial Shifts during Aerobic Flocculation in Couette-Taylor Bioreactors}, author={Hyunsuk, H. and Williams, J.C. and Hsieh, J. and Ducoste, J. and de los Reyes, F.L.}, year={2008} }
 @misc{ducoste_2008, title={Improving our Understanding of Complex Reacting Processes in Water and Wastewater Treatment through Computational Fluid Dynamics}, author={Ducoste, J.}, year={2008} }
 @misc{ducoste_2008, title={Modeling UV reactors in Drinking Water Systems}, author={Ducoste, J.J.}, year={2008} }
 @article{hong_williams_hsieh_ducoste_reyes_2008, title={Monitoring Microbial Shifts during Activated Sludge Floc and Aerobic Granule Development}, volume={2008}, ISSN={1938-6478}, url={http://dx.doi.org/10.2175/193864708788805170}, DOI={10.2175/193864708788805170}, number={11}, journal={Proceedings of the Water Environment Federation}, publisher={Water Environment Federation}, author={Hong, Hyunsuk and Williams, Jon C. and Hsieh, Juchun and Ducoste, Joel J. and Reyes, Francis L. de los}, year={2008}, month={Jan}, pages={4672–4678} }
 @misc{gallimore_ducoste_2008, title={Performance of Grease Interceptors: Evaluating Design Alternatives}, author={Gallimore, E. and Ducoste, J.J.}, year={2008} }
 @article{keener_ducoste_holt_2008, title={Properties Influencing Fat, Oil, and Grease Deposit Formation}, volume={80}, ISSN={["1061-4303"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-57549101731&partnerID=MN8TOARS}, DOI={10.2175/193864708X267441}, abstractNote={Fat, oil, and grease (FOG) deposits are the reported cause of 50 to 75% of sanitary sewer overflows in the United States, resulting in 1.8 × 10 6 m 3 (500 mil. gal) of raw wastewater released into the environment annually. The objective of this research was to characterize the chemical and physical properties of FOG deposits. Twenty‐three cities from around the United States contributed FOG samples for the study. The FOG deposits showed a wide range in yield strength (4 to 34 kPa), porosity (10 to 24%), and moisture content (10 to 60%), suggesting uncontrolled formation processes. A majority of these deposits display hard, sandstonelike texture, with distinct layering effects, suggesting a discontinuous formation process. The results found that 84% of FOG deposits contained high concentrations of saturated fatty acids and calcium, suggesting preferential accumulation.}, number={12}, journal={WATER ENVIRONMENT RESEARCH}, publisher={Wiley}, author={Keener, Kevin M. and Ducoste, Joel J. and Holt, Leon M.}, year={2008}, month={Dec}, pages={2241–2246} }
 @article{ducoste_wood_aziz_groninger_holt_keener_2008, title={Rooting out SSOs: Evaluating Popular Root Control Methods in a Pilot Sanitary Sewer}, volume={20}, number={6}, journal={Water Environment Technology}, author={Ducoste, J.J. and Wood, J. and Aziz, T. and Groninger, J. and Holt, L. and Keener, K.}, year={2008}, pages={56–60} }
 @misc{ducoste_2008, title={Some Thoughts on CFD Modeling for Membrane Bioreactor Processes}, author={Ducoste, J.J.}, year={2008} }
 @inproceedings{richards_ducoste_2007, title={Evaluating sequential disinfection in continuous flow water treatment systems}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84871574021&partnerID=MN8TOARS}, booktitle={American Water Works Association - Water Quality Technology Conference and Exposition 2007: Fast Tracks to Water Quality}, author={Richards, B.H. and Ducoste, J.J.}, year={2007}, pages={2074–2081} }
 @inproceedings{aziz_holt_keener_ducoste_2007, title={Experimental and Numerical Analysis of Grease Interceptor Performance}, author={Aziz, T. and Holt, L. and Keener, K. and Ducoste, J.}, year={2007} }
 @inproceedings{aziz_holt_keener_ducoste_2007, title={Field Observations of Grease Interceptor Performance}, author={Aziz, T. and Holt, L. and Keener, K. and Ducoste, J.}, year={2007} }
 @inproceedings{alpert_knappe_ducoste_2007, title={Incorporation of micromixing models within CFD simulations describing UV-initiated advanced oxidation processes}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84871662252&partnerID=MN8TOARS}, booktitle={American Water Works Association - AWWA Annual Conference and Exposition, ACE 2007}, author={Alpert, S.M. and Knappe, D. and Ducoste, J.}, year={2007}, pages={388–401} }
 @inproceedings{alpert_ducoste_2007, title={Modeling organics degradation with the UV/H2O2 advanced oxidation process using computational fluid dynamics}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84871548365&partnerID=MN8TOARS}, booktitle={American Water Works Association - Water Quality Technology Conference and Exposition 2007: Fast Tracks to Water Quality}, author={Alpert, S.M. and Ducoste, J.J.}, year={2007}, pages={3077–3093} }
 @inproceedings{de los reyes_ducoste_hyman_mota_aslett_hong_2007, title={New Approaches in Determining the Spatial and Metabolic Interactions of Nitrogen-Transforming Bacteria in Microbial Flocs}, author={de los Reyes, F.L. and Ducoste, J. and Hyman, M. and Mota, C. and Aslett, D. and Hong, H.}, year={2007} }
 @article{liu_wu_linden_ducoste_2007, title={Numerical simulation of UV disinfection reactors: Evaluation of alternative turbulence models}, volume={31}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34047229522&partnerID=MN8TOARS}, DOI={10.1016/j.apm.2006.06.004}, abstractNote={Six turbulence models, including standard k–ε, k–ε RNG, k–ω (88), revised k–ω (98), Reynolds stress transport model (RSTM), and two-fluid model (TFM), were applied to the simulation of a closed conduit polychromatic UV reactor. Predicted flow field and turbulent kinetic energy were compared with the experimental data from a digital particle image velocimetry (DPIV). All of the predicted flow fields were combined with a multiple segment source summation (MSSS) fluence rate model and three different microbial response kinetic models to simulate the disinfection process at two UV lamp power conditions. Microbial transport was simulated using the Lagrangian particle tracking method. The results show that the fluence distributions and the effluent inactivation levels were sensitive to the turbulence model selection. The level of sensitivity was a function of the operating conditions and the UV response kinetics of the microorganisms. Simulations with operating conditions that produced higher log inactivation or utilized microorganisms with higher UV sensitivity showed greater sensitivity to the turbulence model selection. In addition, a broader fluence distribution was found with turbulence models that predicted a larger wake region behind the lamps.}, number={9}, journal={Applied Mathematical Modelling}, author={Liu, D. and Wu, C. and Linden, K. and Ducoste, J.}, year={2007}, pages={1753–1769} }
 @article{wood_aziz_groninger_holt_keener_ducoste_2007, title={Observation and Analysis of Popular Root Control Methods in Pilot Scale Sanitary Sewer}, volume={2007}, ISSN={1938-6478}, url={http://dx.doi.org/10.2175/193864707787223565}, DOI={10.2175/193864707787223565}, abstractNote={Observation and Analysis of Popular Root Control Methods in Pilot Scale Sanitary SewerRoot intrusion in sanitary sewers is a significant contributor to the alarming rate of sanitary sewer overflows occurring in the US. A better understanding of popular root control methods is required for the development of an optimal root removal protocol. This research focuses on experiment design and data collection for the comparison of popular root control methods in a pilot scale sewer...Author(s)Justin WoodTarek AzizJohn GroningerLeon HoltKevin KeenerJoel DucosteSourceProceedings of the Water Environment FederationSubjectSession 86: Operation and MaintenanceDocument typeConference PaperPublisherWater Environment FederationPrint publication date Oct, 2007ISSN1938-6478SICI1938-6478(20071001)2007:11L.6842;1-DOI10.2175/193864707787223565Volume / Issue2007 / 11Content sourceWEFTECFirst / last page(s)6842 - 6864Copyright2007Word count105Subject keywordsSANITARY SEWER OVERFLOWTREE ROOT CONTROLDICHLOBENIL (ROOTX)DIQUAT (RAZOROOTER II)}, number={11}, journal={Proceedings of the Water Environment Federation}, publisher={Water Environment Federation}, author={Wood, Justin and Aziz, Tarek and Groninger, John and Holt, Leon and Keener, Kevin and Ducoste, Joel}, year={2007}, month={Oct}, pages={6842–6864} }
 @article{prat_ducoste_2007, title={Simulation of flocculation in stirred vessels - Lagrangian versus Eulerian}, volume={85}, ISSN={["1744-3563"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33947272599&partnerID=MN8TOARS}, DOI={10.1205/cherd05001}, abstractNote={Abstract A study has been performed to evaluate Lagrangian and Eulerian approaches for simulating flocculation in stirred vessels. The prediction of the transient floc size evolution was performed using the quadrature method of moments (QMOM) while flow field characteristics within the turbulent stirred vessel were obtained using computational fluid dynamics (CFD). The Eulerian and Lagrangian CFD/QMOM models were applied to a 28 l square tank using either a Rushton turbine or a fluid foil impeller. Simulations were performed with an initial concentration of 100 mg L −1 of 1 μm nominal clay particles for several average characteristic velocity gradients (40-, 70-, 90-, 150-s −1 ). For the Lagrangian approach, the results showed that the average floc size transient evolution curve does not predict a peak followed by a lower steady-state size as observed for higher shear rates with the Eulerian approach. However, the overall good agreement between the Eulerian and Lagrangian CFD/QMOM models, indicates that a Lagrangian approach combined with a QMOM model would be an efficient method to quantify the impact of non-fluid flow experimental conditions on the flocculation process. In addition, the Lagrangian CFD/QMOM approach may be a useful tool to study the dynamics of flocculation and determine appropriate coalescence/breakup kernels when performing an inverse problem technique.}, number={A2}, journal={CHEMICAL ENGINEERING RESEARCH & DESIGN}, author={Prat, O. P. and Ducoste, J. J.}, year={2007}, month={Feb}, pages={207–219} }
 @inproceedings{alpert_knappe_ducoste_2007, title={The Use of Computational Fluid Dynamics (CFD) to Model UV-Initiated Advanced Oxidation Processes}, author={Alpert, S. and Knappe, D. and Ducoste, J.}, year={2007} }
 @book{hulsey_linden_ducoste_2007, place={Denver, CO}, title={UV Disinfection for Large Water Treatment Plants}, institution={American Water Works Association Research Foundation}, author={Hulsey, R. and Linden, K.G. and Ducoste, J.J.}, year={2007} }
 @article{bohrerova_mamane_ducoste_linden_2006, title={Comparative inactivation of Bacillus subtilis spores and MS-2 coliphage in a UV reactor: Implications for validation}, volume={132}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33751075457&partnerID=MN8TOARS}, DOI={10.1061/(asce)0733-9372(2006)132:12(1554)}, abstractNote={Biodosimetry is the currently accepted method for validation of fluence delivery in ultraviolet (UV) reactors for water disinfection. This method utilizes the inactivation of a surrogate microorganism to predict the reduction equivalent fluence and subsequent inactivation of a target pathogen. Two common surrogates—Bacillus subtilis spores and MS-2 coliphage—were used to examine the relationship between surrogate type and biodosimetry results. A pilot-scale LP UV reactor was investigated at two flow conditions (7.5 and 15 gpm ) and four different UV 253.7 nm water transmittance (UVT, 1 cm ) values between 82 and 91%. The calculated reduction equivalent fluence differed from a maximum of 30% at 7.5 gal.∕min and 15% at 15 gal.∕min between the surrogates tested, depending on the UVT. These differences were attributed to the sensitivity of organisms used, hydraulic inefficiences, and UV fluence distribution in the reactor, thus the choice of validation microbe may impact the determination of reduction equival...}, number={12}, journal={Journal of Environmental Engineering (New York, N.Y.)}, author={Bohrerova, Z. and Mamane, H. and Ducoste, J. and Linden, K. G.}, year={2006}, pages={1554–1561} }
 @article{mamane_ducoste_linden_2006, title={Effect of particles on ultraviolet light penetration in natural and engineered systems}, volume={45}, ISSN={["2155-3165"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33645776519&partnerID=MN8TOARS}, DOI={10.1364/AO.45.001844}, abstractNote={The effect of light scattering on measurement of UV absorbance and penetration of germicidal UVC irradiance in a UV reactor were studied. Using a standard spectrophotometer, absorbance measurements exhibited significant error when particles that scatter light were present but could be corrected by integrating sphere spectroscopy. Particles from water treatment plants and wastewater effluents exhibited less scattering (20%-30%) compared with particles such as clay (50%) and alumina (95%-100%). The distribution of light intensity in a UV reactor for a scattering suspension was determined using a spherical chemical actinometry method. Highly scattering alumina particles increased the fluence rate in the reactor near the UV lamp, whereas clay particles and absorbing organic matter reduced the fluence rate. A radiative transfer fluence rate model reasonably predicted the fluence rate of absorbing media and highly scattering suspensions in the UV reactor.}, number={8}, journal={APPLIED OPTICS}, author={Mamane, H and Ducoste, JJ and Linden, KG}, year={2006}, month={Mar}, pages={1844–1856} }
 @book{ducoste_linden_2006, place={Denver, CO}, title={Hydrodynamic Characterization of UV Reactors}, institution={American Water Works Association Research Foundation}, author={Ducoste, J.J. and Linden, K.G.}, year={2006} }
 @article{liu_ducoste_2006, title={Impact of turbulent mixing on the performance of a CFD chloramine model}, volume={23}, ISSN={["1557-9018"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33645946706&partnerID=MN8TOARS}, DOI={10.1089/ees.2006.23.341}, abstractNote={A study was performed to investigate the impact of turbulent mixing on the performance of a computational fluid dynamics (CFD) chloramine model. Experimental tests were performed in a pilot-scale reactor where the turbulent flow field was altered by the placement and removal of a perforated baffle at the reactor inlet upstream from three ammonia injection mixers (cone-, three-bar-, and T-bar-diffuser). As part of this study, several turbulence models were incorporated into a CFD model to investigate the impact of the selection of turbulence models on the predicted free-chlorine residual. The turbulence models examined in this study included the standard k-ξ, RNG k-ξ, and k-ω models. Furthermore, a sensitivity analysis was performed to investigate the impact of several turbulent mixing time scales [the eddy-dissipation time scale (EDT), Kolmogorov time scale (KOLM), and Corrsin time scale] on the predicted residual free chlorine concentration. All model predictions were compared with experimental free-chlo...}, number={2}, journal={ENVIRONMENTAL ENGINEERING SCIENCE}, author={Liu, YJ and Ducoste, JJ}, year={2006}, pages={341–356} }
 @misc{ducoste_2006, title={Modeling Flocculation in Secondary Clarifiers using Quadrature Method of Moments}, author={Ducoste, J.J.}, year={2006} }
 @article{prat_ducoste_2006, title={Modeling spatial distribution of floc size in turbulent processes using the quadrature method of moment and computational fluid dynamics}, volume={61}, ISSN={["1873-4405"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-25644438483&partnerID=MN8TOARS}, DOI={10.1016/j.ces.2004.11.070}, abstractNote={A study was performed that utilizes the quadrature method of moments (QMOM) to model the transient spatial evolution of the floc size in a heterogeneous turbulent stirred reactor. The QMOM approach was combined with a commercial computational fluid dynamics (CFD) code (PHOENICS), which was used to simulate the turbulent flow and transport of these aggregates in the reactor. The CFD/QMOM model was applied to a 28 l square reactor containing an axial flow impeller and 100 mg/l concentration of 1 μm nominal clay particles. Simulations were performed for different average characteristic velocity gradients (40,70,90, and 150 s-1). The average floc size and growth rate were compared with experimental measurements performed in the bulk region and the impeller discharge region. The CFD/QMOM results confirmed the experimentally measured spatial heterogeneity in the floc size and growth rate. In addition, the model predicts spatial variations in the aggregation and breakup rates. Finally, the model also predicts that the transport of flocs into the high shear impeller discharge zone was responsible for the transient evolution of the average floc size curve displaying a maximum before decreasing to a steady-state floc size.}, number={1}, journal={CHEMICAL ENGINEERING SCIENCE}, author={Prat, OP and Ducoste, JJ}, year={2006}, month={Jan}, pages={75–86} }
 @misc{ducoste_2006, title={Modeling the Regulatory Behavior of E coli in Heterogeneous Substrate Environment}, author={Ducoste, J.J.}, year={2006} }
 @article{liu_ducoste_2006, title={Numerical simulation of chloramines formation in turbulent flow using a multi-fluid micromixing model}, volume={21}, ISSN={["1873-6726"]}, DOI={10.1016/j.envsoft.2005.06.007}, abstractNote={A study has been performed to investigate the use of Computational Fluid Dynamics (CFD) for the analysis of ammonia injection methods to produce chloramines in water containing residual free chlorine. In this study, the Reynolds-averaged Navier–Stokes Equation and turbulence model were combined with chloramines kinetic models to predict downstream spatial distribution of residual free chlorine. As part of this study, a CFD model with the RNG k–ɛ turbulence model was combined with a multi-fluid microscale model (MFM) to investigate the impact of micromixing on the free chlorine residual. All model predictions were compared with experimental measurements of the free chlorine residual at different upstream and downstream locations from the ammonia injection point. Three types of ammonia diffusers were simulated and tested in the presented work. The results showed that the incorporation of the MFM approach can enhance the numerical prediction of the free chlorine spatial distribution. In addition, the modeling results confirmed the experimental observation that multi-nozzle diffusers displayed better mixing performance than the cone-shape diffuser with a single nozzle in a pilot-scale reactor.}, number={8}, journal={ENVIRONMENTAL MODELLING & SOFTWARE}, author={Liu, Yanjin and Ducoste, Joel}, year={2006}, month={Aug}, pages={1198–1213} }
 @article{liu_ducoste_2006, title={Numerical simulation of chloramines formation in turbulent flow using a multi-fluid micromixing model}, volume={21}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-33646341206&partnerID=MN8TOARS}, DOI={10.1016/j.chaos.2005.08.200}, abstractNote={In this paper, the relation between synchronization and pattern formation in one-dimensional discrete and continuous open flow models is investigated in detail. Firstly a sufficient condition for globally asymptotical stability of lag/anticipating synchronization among lattices of these models is proved by analytic method. Then, by analyzing and simulating lag/anticipating synchronization in discrete case, three kinds of pattern of wave (it is called wave pattern) travelling in the lattices are discovered. Finally, a proper definition for these kinds of pattern is proposed.}, number={8}, journal={Environmental Modelling and Software}, author={Liu, Y. and Ducoste, J.}, year={2006}, pages={1198–1213} }
 @misc{ducoste_2006, title={The Impact of Upstream turbulence characteristics on Ultraviolet (UV) Disinfection Reactors Performance}, author={Ducoste, J.J.}, year={2006} }
 @article{ducoste_linden_2005, title={(D)etermination of ultraviolet sensor location for sensor set-point monitoring using computational fluid dynamics}, volume={4}, ISSN={["1496-2551"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-19944392912&partnerID=MN8TOARS}, DOI={10.1139/S04-025}, abstractNote={ A study was performed to investigate the use of computational fluid dynamics (CFD) coupled with a fluence rate model to determine ultraviolet (UV) sensor placement for a "set point" monitoring approach to UV reactor operation. Simulations were performed in a two-lamp closed conduit reactor using two fluence rate models: RADial line source integration (RAD-LSI) and multiple segment source summation (MSSS). In addition, simulations were performed assuming first order inactivation kinetics with two rate constants representing a high UV sensitive and a low UV sensitive microorganism. The optimal sensor location was determined by calculating the linearity of the reduction equivalent fluence (REF) as a function of the local fluence rate regardless of the UV transmissivity (UVT). Results showed that a small range of possible locations exist where the sensor can be placed to achieve a single REF for each fluence rate value. However, the predicted optimal location was a function of the selected fluence rate model and the target microorganism. The determination of the sensor location for sensor set point monitoring should be performed with the MSSS approach, which includes refraction, reflection, shadowing, and sensor characteristics. Moreover, simulations performed with the more resistant microorganism produced a narrower spatial range of optimal sensor locations than with the less resistant microorganism. Key words: model, CFD, UV disinfection, monitoring, fluence rate. }, number={SUPPL. 1}, journal={JOURNAL OF ENVIRONMENTAL ENGINEERING AND SCIENCE}, author={Ducoste, J and Linden, K}, year={2005}, pages={S33–S43} }
 @article{ducoste_liu_linden_2005, title={Alternative approaches to modeling fluence distribution and microbial inactivation in ultraviolet reactors: Lagrangian versus Eulerian}, volume={131}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-26444592023&partnerID=MN8TOARS}, DOI={10.1061/(asce)0733-9372(2005)131:10(1393)}, abstractNote={A study was performed to evaluate alternative methods for predicting the ultraviolet (UV) reactor performance using computational fluid dynamics. The study consists of modeling the UV fluence distribution and microbial inactivation using either Lagrangian or Eulerian methods for both low- and medium-pressure UV reactors. In the Eulerian method, fluence distributions were calculated using a flow-weighted and a mass-weighted fraction technique. The results show that the Eulerian flow-weighted fraction fluence distribution agreed well with the Lagrangian particle tracking fluence distribution when applied to the UV reactor outlet plane. However, when applied to planes downstream from effluent hydraulic structures, the Eulerian fluence distribution method was influenced by the additional convective mixing from these hydraulic structures and predicts a tighter fluence distribution range than the Lagrangian method. The Eulerian approach to modeling microbial inactivation seems comparable to the Lagrangian particle tracking approach and can be viewed as a suitable alternative to the Lagrangian approach. The results also show that the Eulerian mass-weighted fraction distribution is comparable to the microbial kinetic weighted Lagrangian particle tracking approach, which can provide greater sensitivity to the low fluence regions in the UV reactor.}, number={10}, journal={Journal of Environmental Engineering (New York, N.Y.)}, author={Ducoste, J. and Liu, D. and Linden, K.}, year={2005}, pages={1393–1403} }
 @article{ducoste_linden_rokjer_liu_2005, title={Assessment of reduction equivalent fluence bias using computational fluid dynamics}, volume={22}, ISSN={["1557-9018"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-23944504236&partnerID=MN8TOARS}, DOI={10.1089/ees.2005.22.615}, abstractNote={A study was performed to investigate the use of computational fluid dynamics (CFD) coupled with a fluence rate model to determine the bias in UV biodosimetry measurements using inactivation of a challenge microbe instead of the target pathogen—termed the reduction equivalent fluence (REF) bias. Simulations were performed using two fluence rate models: RADial Line Source Integration (RADLSI), and UVCalc3D, a multiple segment source summation (MSSS). CFD UV models were carried out in several closed-conduit UV reactors using either mono- or polychromatic lamps. Simulations were also performed with different UV transmittances, flow rates, lamp power settings, and with lamps out of service. In addition, the Cryptosporidium fluence response kinetics was approximated using two nonlinear models: a P-factor model, and a Rational model. The REF bias was computed using the predicted fluence distribution from a Lagrangian particle tracking routine and compared with the REF bias computed using the EPA UV disinfection ...}, number={5}, journal={ENVIRONMENTAL ENGINEERING SCIENCE}, author={Ducoste, J and Linden, K and Rokjer, D and Liu, D}, year={2005}, pages={615–628} }
 @article{bohrerova_bohrer_mohanraj_ducoste_linden_2005, title={Experimental measurements of fluence distribution in a UV reactor using fluorescent microspheres}, volume={39}, ISSN={["1520-5851"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-27744547508&partnerID=MN8TOARS}, DOI={10.1021/es050034c}, abstractNote={One concern with current techniques of UV reactor validation is that they provide only a measure of the mean UV fluence. In this research, the actual fluence distribution of a UV reactor is measured through the use of photochemically active fluorescent microspheres. Experimental tests were performed in a pilot-scale monochromatic UV 254 nm reactor operated at two flow rates. Analysis of the fluorescence intensity decay was performed using collimated beam experiments for determination of decay rate kinetics. A stochastic hierarchal process involving Bayesian statistics, and the Markov chain Monte Carlo integration technique was used to correlate the microsphere fluorescence intensity distribution to the UV fluence distribution. The experimental UV fluence distribution was compared with the fluence distribution predicted using a computational fluid dynamics model. The results showed that the fluorescent microspheres measured a wider distribution of UV fluences with a flow rate of 3 gpm than with 7.5 gpm. The principal differences between the modeled and the measured distribution were in the low UV fluences where the microspheres predicted lower fluence levels than the model. The use of microspheres is demonstrated as a novel technique for measurement of the fluence distribution in UV reactors. This technique has both fundamental and practical implications for reactor evaluation and testing and could improve confidence in the future use of mathematical models for UV reactor characterization. It also serves as a complement to biodosimetry testing by providing greater insights regarding reactor behavior and validation.}, number={22}, journal={ENVIRONMENTAL SCIENCE & TECHNOLOGY}, author={Bohrerova, Z and Bohrer, G and Mohanraj, SM and Ducoste, J and Linden, KG}, year={2005}, month={Nov}, pages={8925–8930} }
 @inproceedings{bohrerova_bohrer_linden_ducoste_mohan mohanraj_2005, title={Experimental measurements of fluence distribution in a UV reactor using fluorescent microspheres}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84874289129&partnerID=MN8TOARS}, booktitle={2005 Water Quality Technology Conference Proceedings, WQTC 2005}, author={Bohrerova, Z. and Bohrer, G. and Linden, K.G. and Ducoste, J.J. and Mohan Mohanraj, S.}, year={2005} }
 @inproceedings{ducoste_liu_linden_mamane-gravetz_bohrerova_2005, title={Impact of Influent Pipe Configuration on UV Reactor Performance: Is the Elbow Truly the Worst Case Hydraulic Condition?}, volume={2005}, ISSN={1938-6478}, url={http://dx.doi.org/10.2175/193864705783978348}, DOI={10.2175/193864705783978348}, abstractNote={Impact of Influent Pipe Configuration on UV Reactor Performance: Is the Elbow Truly the Worst Case Hydraulic Condition?A study has been performed to investigate the impact of upstream piping configurations on the UV disinfection performance. In this study, experimental biodosimetry and numerical simulations were performed on a pilot-scale monochromatic reactor with and without an upstream elbow piping configuration. In addition, simulations using a validated numerical model were performed on a full-scale...Author(s)Joel J. DucosteDong LiuKarl G. LindenHadas Mamane-GravetzZuzana BohrerovaSourceProceedings of the Water Environment FederationSubjectSession 4: Disinfection System Validation 1Document typeConference PaperPublisherWater Environment FederationPrint publication date Jan, 2005ISSN1938-6478SICI1938-6478(20050101)2005:1L.257;1-DOI10.2175/193864705783978348Volume / Issue2005 / 1Content sourceDisinfection and Reuse SymposiumFirst / last page(s)257 - 270Copyright2005Word count262}, number={1}, booktitle={Proceedings of the Water Environment Federation}, publisher={Water Environment Federation}, author={Ducoste, Joel J. and Liu, Dong and Linden, Karl G. and Mamane-Gravetz, Hadas and Bohrerova, Zuzana}, year={2005}, month={Jan}, pages={257–270} }
 @inproceedings{mamane-gravetz_ducoste_linden_2005, title={Impact of Particles on UVC Light Penetration in Natural and Engineered Systems}, booktitle={Proceedings International Ultraviolet Association Conference}, author={Mamane-Gravetz, H. and Ducoste, J.J. and Linden, K.G.}, year={2005} }
 @misc{liu_ducoste_2005, title={Impact of Turbulent Mixing on Chloramines Formation}, journal={Proceedings Chesapeake Section AWWA Annual Conference}, author={Liu, Y. and Ducoste, J.J.}, year={2005} }
 @misc{ducoste_2005, title={Impact of Upstream Hydraulic Structures on UV Reactor Performance}, author={Ducoste, J.J.}, year={2005} }
 @article{jin_linden_ducoste_liu_2005, title={Impact of lamp shadowing and reflection on the fluence rate distribution in a multiple low-pressure UV lamp array}, volume={39}, ISSN={["0043-1354"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-21744448033&partnerID=MN8TOARS}, DOI={10.1016/j.watres.2005.04.071}, abstractNote={Use of mathematical modeling for determination of ultraviolet (UV) fluence in disinfection reactors requires accurate knowledge of the fluence rate distribution in a multiple lamp array. A method for measuring the fluence rate among a multiple lamp array was demonstrated using spherical actinometry. A matrix of four low-pressure UV lamps in air were investigated to evaluate the potential for shadowing and reflection to impact the fluence rate within and surrounding the lamp array. Two fluence rate distribution models were tested to determine the ability to predict the fluence rate distribution measured by the actinometers. Shadowing proved to attenuate UV light. Reflection from the lamp surface added 3-9% to the fluence rate, depending upon position in the reactor. These effects, as well as the fluence rate at various points in the lamp matrix were effectively modeled using RAD-LSI and UVCalc3D fluence rate distribution models. At fluence rates above 8mWcm(-2), the actinometry measured fluence rate was lower than the modeled rate, presumably from saturation of the actinometer solution at high fluence rates (close to the lamp). With multiple lamp reactors, the impact of shadowing can significantly affect fluence rate distribution and thus the level of microbial inactivation. If shadowing is not included in fluence rate distribution models, the fluence rate will be over predicted in the shadow zone of a neighboring lamp, falsely skewing model inactivation predictions.}, number={12}, journal={WATER RESEARCH}, author={Jin, SS and Linden, KG and Ducoste, J and Liu, D}, year={2005}, month={Jul}, pages={2711–2721} }
 @misc{ducoste_2005, title={Simulation of Flocculation in Stirred Vessels using Quadrature Method of Moments: Evaluation of Lagrangian versus Eulerian Approaches}, author={Ducoste, J.J.}, year={2005} }
 @misc{ducoste_2005, title={The Intricacies of Designing Ultraviolet (UV) Disinfection Reactors using Numerical Models}, author={Ducoste, J.J.}, year={2005} }
 @article{ormeci_ducoste_linden_2005, title={UV disinfection of chlorinated water: impact on chlorine concentration and UV dose delivery}, volume={54}, ISSN={["0003-7214"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-20444439220&partnerID=MN8TOARS}, DOI={10.2166/aqua.2005.0018}, abstractNote={Prechlorination of water upstream of an ultraviolet (UV) disinfection process may possibly influence the effectiveness of UV inactivation through the absorbance of UV radiation. Alternatively, UV may act to destroy chlorine, reducing the residual in water. Monochromatic UV light was more effective in degrading monochloramine whereas polychromatic UV light was more effective in degrading free chlorine. The extent of degradation varied with the type of chlorine species, water quality and type of UV irradiation (mono- or polychromatic). However, decay of chlorine and monochloramine at typical UV disinfection doses (<100 mJ/cm2) was negligible. The transmission of UV irradiation was affected slightly by the presence of chlorine and monochloramine, and these effects on inactivation of MS2 coliphage were modeled for LP− and MP-UV reactors. The presence of 1 mg/L free chlorine or monochloramine decreased the inactivation of MS2 coliphage by less than 0.1 log for a LP-UV reactor. For the MP-UV reactor, MS2 inactivation decreased by between 0.1 and 0.3 log.}, number={3}, journal={JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA}, author={Ormeci, B and Ducoste, JJ and Linden, KG}, year={2005}, month={May}, pages={189–199} }
 @article{baeza_ducoste_2004, title={A non-biological surrogate for sequential disinfection processes}, volume={38}, ISSN={["0043-1354"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-3342922732&partnerID=MN8TOARS}, DOI={10.1016/j.watres.2004.04.029}, abstractNote={An evaluation of Fluorescent YG-microspheres (Polysciences Inc.) was performed to simulate Cryptosporidium parvum (C. parvum) oocysts inactivation in treatment systems that utilize multiple disinfectants. Experiments were conducted in batch reactors that included an ozone primary stage and a secondary free chlorine treatment stage. A flow cytometer was used to track changes in the fluorescence intensity distribution due to exposure to the chemical disinfectant. Microsphere ‘survival ratios’ (N/No) were calibrated by selecting an appropriate fluorescence intensity threshold to replicate the inactivation of different C. parvum oocysts strains. Results showed that fluorescent microspheres displayed synergistic effects in the presence of two sequential disinfectants. In addition, microsphere structural tests showed that the polystyrene surface was damaged due to exposure to ozone. This polystyrene damage enhanced the diffusion of the secondary disinfectant into the microsphere, where dye was degraded in the opened polymer layer. As a result, YG-fluorescent microspheres is a promising non-biological technique that is capable of producing similar synergistic behavior as with C. parvum oocysts exposed to ozone followed by chlorine.}, number={14-15}, journal={WATER RESEARCH}, author={Baeza, C and Ducoste, J}, year={2004}, pages={3400–3410} }
 @book{nopens_malise_biggs_ducoste_2004, place={Ghent, Belgium}, title={Advances in Population Balance Modeling}, publisher={Eurosis}, year={2004} }
 @inproceedings{richards_baeza_ducoste_2004, title={Assessing Sequential Disinfection Performance in a Flow Through System Using a Non-Biological Surrogate}, booktitle={Proceedings, AWWA Research Symposium}, author={Richards, B.H. and Baeza, C. and Ducoste, J.}, year={2004} }
 @misc{ducoste_2004, title={Characterization of Dose Distribution in UV Reactors}, author={Ducoste, J.J.}, year={2004} }
 @misc{richards_ducoste_2004, title={Characterizing Sequential Disinfection in Flow Through Systems}, author={Richards, B. and Ducoste, J.J.}, year={2004} }
 @article{liu_ducoste_jin_linden_2004, title={Evaluation of alternative fluence rate distribution models}, volume={53}, ISSN={["1365-2087"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-6344252713&partnerID=MN8TOARS}, DOI={10.2166/aqua.2004.0031}, abstractNote={A detailed evaluation of several fluence rate distribution models was performed. These models included line source integration (LSI), multiple points source summation (MPSS), multiple segment source summation (MSSS), UVCalc3D, RAD-LSI, view factor and discrete ordinate (DO). As part of the evaluation, a complete MSSS model, which accounts for the quartz sleeve thickness when calculating the refraction angles, was developed. In addition, a simple attenuation factor was introduced to integrate the physics of reflection, refraction and absorption effects into the LSI model. As an alternative simple correction to the LSI, the RAD-LSI incorporates the RADIAL intensity model into the original LSI formulation. All models were compared with experimental measurements using spherical actinometers, which measure the fluence rate at specific points in space. Experimental measurements were performed in air and water. Experiments in water were performed at two different ultraviolet transmittance (UVTs) (77 and 88%). The results showed that models that neglected the effects of refraction deviated significantly from the experimental data. In addition, the MSSS approach or models that incorporated the MSSS concept were found to best match the experimentally measured fluence rate distribution. Moreover, little difference was found between the results of MSSS with quartz sleeve thickness and UVCalc3D, which does not model the quartz sleeve thickness in the refraction angle calculation but uses a factor to account for the effects of the quartz sleeve on the fluence rate. The attenuation factor combined with the LSI model was found to match the MSSS model predictions, while reducing the computational cost.}, number={6}, journal={JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA}, author={Liu, D and Ducoste, J and Jin, S and Linden, K}, year={2004}, month={Sep}, pages={391–408} }
 @inproceedings{peplinski_ducoste_2004, title={Lessons for applying computational fluid dynamics modeling to disinfection clearwells}, volume={111}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-75649146660&partnerID=MN8TOARS}, DOI={10.1061/40569(2001)22}, abstractNote={Computational Fluid Dynamics (CFD) modeling offers the potential of improving disinfection contactor hydraulics, allowing a decrease in the applied disinfectant dose without a decrease in the level of microbial inactivation. For treatment systems utilizing chlorine as a disinfectant, this would result in both a reduction in chemical costs and in disinfection by-products (DBPs). Current modeling of clearwell hydraulics is based on accurate prediction of the effluent residence time distribution (RTD) curve. Researchers have shown that CFD models can predict a majority of the experimental RTD curve, but under certain circumstances may not reproduce the entire curve. The objectives of this study were to numerically characterize tracer transport through a disinfection contactor, investigate the impact of grid density, time step interval, and investigate the impact of accurately modeling perforated baffles on the resulting RTD curve.}, booktitle={Bridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001}, author={Peplinski, D.K. and Ducoste, J.J.}, year={2004} }
 @inproceedings{prat_ducoste_2004, title={Modeling Spatial Distribution of Floc size in Turbulent Processes Using Quadrature Method of Moment and Computational Fluid Dynamics}, author={Prat, O. and Ducoste, J.J.}, year={2004} }
 @article{ortiz_ducoste_2004, title={Modeling low-energy mixers for chemical dispersion in water treatment}, volume={21}, ISSN={["1557-9018"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-1542513928&partnerID=MN8TOARS}, DOI={10.1089/109287504773087408}, abstractNote={A study has been conducted to evaluate the use of computational fluid dynamics (CFD) for analyzing the mixing effectiveness of low-energy mixers in water and wastewater treatment processes. In this study, CFD was used to predict experimental downstream mean tracer concentration and segregation intensity in different closed conduit reactor geometries. Mixing configurations include a plane shear layer, plane jet in a square conduit, a round jet in a circular conduit, and a hydraulic jet in a 1- and 6-in. diameter pipe. Tracer transport was approximated as a single fluid with the standard k-e, Chen-Kim k-e, RNG k-e turbulence models and as a multifluid with the standard k-e turbulence model. The results showed that the multifluid model better predicted the mean concentration than the single-fluid model. Multifluid model r2 values were significantly higher than the single-fluid model r2 values. The multifluid model also predicted the downstream segregation intensity values for the plane jet and round jet conf...}, number={2}, journal={ENVIRONMENTAL ENGINEERING SCIENCE}, author={Ortiz, V and Ducoste, JJ}, year={2004}, pages={241–261} }
 @inproceedings{ducoste_liu_2004, title={Numerical Prediction of Mixing Performance for Chloramines Formation}, booktitle={Proceedings AWWA Water Quality Technology Conference}, author={Ducoste, J.J. and Liu, Y.}, year={2004} }
 @inproceedings{ducoste_linden_rokjer_2004, title={Numerical Prediction of the Reduction Equivalent Fluence Bias}, booktitle={Proceedings AWWA Water Quality Technology Conference}, author={Ducoste, J.J. and Linden, K.G. and Rokjer, D.}, year={2004} }
 @misc{ducoste_2004, title={Numerical Prediction of the Reduction Equivalent Fluence Bias, Invited Presentation at Degremont North}, author={Ducoste, J.J.}, year={2004} }
 @misc{prat_ducoste_2004, title={Performance Analysis of Quadrature Method of Moments (QMOM) for PBM Systems used in Assessing Flocculation Processes in Water and Wastewater Treatment}, author={Prat, O. and Ducoste, J.J.}, year={2004} }
 @article{hopkins_ducoste_2003, title={Characterizing flocculation under heterogeneous turbulence}, volume={264}, ISSN={["0021-9797"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0042669795&partnerID=MN8TOARS}, DOI={10.1016/S0021-9797(03)00446-6}, abstractNote={This study investigated the impact of turbulent heterogeneity in a flocculation reactor on particle aggregation and breakup. In particular, the influence of average characteristic velocity gradient (G), particle concentration, and coagulation mechanism (sweep floc vs charge neutralization) on the floc growth, steady-state size, and variance was analyzed. Experiments were performed in a bench-scale reactor with a low-shear axial-flow impeller using a photometric dispersion analyzer (PDA). Results indicated that as G increased, floc growth increased while the mean size and variance in the floc size distribution decreased. In addition, floc growth, mean size, and variance increased with increasing primary particle concentration and when the coagulation mechanism was switched from charge neutralization to sweep floc. Lastly, floc growth, mean size, and variance were found to vary spatially in the reactor at low G values with larger floc size and growth rate in the bulk region and a larger variance in the impeller discharge region.}, number={1}, journal={JOURNAL OF COLLOID AND INTERFACE SCIENCE}, author={Hopkins, DC and Ducoste, JJ}, year={2003}, month={Aug}, pages={184–194} }
 @inproceedings{baeza_richards_ducoste_2003, title={Evaluation Of Sequential Disinfection Strategy in Drinking Water Treatment using a Non-Biological Surrogate}, author={Baeza, C. and Richards, B.H. and Ducoste, J.}, year={2003} }
 @inproceedings{ducoste_liu_shanshan_linden_2003, title={Evaluation of UV Fluence Rate Distribution Models}, booktitle={Proceedings International Ultraviolet Association Conference}, author={Ducoste, J.J. and Liu, D. and Shanshan, J. and Linden, K.G.}, year={2003} }
 @inproceedings{hulsey_mackey_neemann_linden_ducoste_2003, title={Implementing UV into Large Water Treatment Plants}, booktitle={Proceedings International Ultraviolet Association Conference}, author={Hulsey, R. and Mackey, H. and Neemann, J. and Linden, K. and Ducoste, J.}, year={2003} }
 @inproceedings{rokjer_valade_keesler_borsykowsky_ducoste_2003, title={Medium Pressure UV Reactor Models for Validation Purposes}, booktitle={Proceedings AWWA Water Quality and Technology Conference}, author={Rokjer, D. and Valade, M. and Keesler, D. and Borsykowsky, M. and Ducoste, J.}, year={2003} }
 @article{chaiprapat_cheng_classen_ducoste_liehr_2003, title={Modeling Nitrogen Transport in Duckweed Pond for Secondary Treatment of Swine Wastewater}, volume={129}, ISSN={0733-9372 1943-7870}, url={http://dx.doi.org/10.1061/(asce)0733-9372(2003)129:8(731)}, DOI={10.1061/(asce)0733-9372(2003)129:8(731)}, abstractNote={A mathematical model was developed to describe nitrogen transport in duckweed-covered static ponds for nutrient recovery from swine lagoon water. A finite difference technique was used to solve the partial differential equations describing the ammonia transport and concentration in the pond. The key parameters in the model include the diffusion coefficient of ammonium in the medium (D) and kinetic constant of nitrogen uptake by duckweed (k). Using one order of magnitude parameter variations, the simulations showed that the model was clearly much more sensitive to D than to k, indicating the process of nitrogen removal in a static pond by duckweed is diffusion limited. Laboratory testing was conducted with Spirodela punctata 7776, a duckweed strain, to calibrate the model. The calibration of the model with experimental data yielded a new ammonium transport coefficient (T) that is 85 times of D value. Model results showed good agreement with depth-wise experimental ammonium concentration and the model also ...}, number={8}, journal={Journal of Environmental Engineering}, publisher={American Society of Civil Engineers (ASCE)}, author={Chaiprapat, Sumate and Cheng, Jiayang and Classen, John J. and Ducoste, Joel J. and Liehr, Sarah K.}, year={2003}, month={Aug}, pages={731–739} }
 @misc{ducoste_2003, title={The Intricacies of using Numerical Models for Analyzing/Designing Ultraviolet UV Disinfection Reactors}, author={Ducoste, J.J.}, year={2003} }
 @inproceedings{liu_ducoste_2003, title={Using CFD Model to Analyze Mixing Performance for the Formation of Chloramines}, booktitle={Proceedings NC AWWA/WEF Annual Conference}, author={Liu, Y. and Ducoste, J.}, year={2003} }
 @misc{ducoste_ortiz_liu_2002, title={A Multifluid Modeling Approach to Characterizing Chemical Dispersion in Drinking Water Treatment}, author={Ducoste, J.J. and Ortiz, V. and Liu, Y.}, year={2002} }
 @article{ducoste_2002, title={A two-scale PBM for modeling turbulent flocculation in water treatment processes}, volume={57}, ISSN={["0009-2509"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0037189454&partnerID=MN8TOARS}, DOI={10.1016/S0009-2509(02)00108-2}, abstractNote={A population balance model (PBM) that incorporates two scales of turbulent motion in the breakup frequency function has been presented. The breakup frequency function is designed such that particles smaller than the impeller-region Kolmogoroff microscale will erode according to a critical velocity related to the local energy dissipation rate. Particles larger than the impeller-region Kolmogoroff microscale will fracture according to a critical velocity related to the impeller tip speed. The two-scale model was found to better predict the experimental steady-state particle size distribution in 5, 28, and 560l tank sizes and with a Rushton turbine and A310 fluid foil impellers. The two-scale PBM was also used to investigate the most appropriate scale-up law for drinking water flocculation processes. In addition, the impact of higher tank average energy dissipation rate, primary particle concentration, and coagulant concentration on the volume mean particle size with increasing tank size and different impeller types was also presented.}, number={12}, journal={CHEMICAL ENGINEERING SCIENCE}, author={Ducoste, J}, year={2002}, month={Jun}, pages={2157–2168} }
 @inproceedings{ducoste_linden_2002, title={An Alternative Approach to Determining Dose Distribution and Microbial Inactivation in UV Reactors using Computational Fluid Dynamics (CFD)}, booktitle={Proceedings American Water Works Association National Conference}, author={Ducoste, J.J. and Linden, K.}, year={2002} }
 @inproceedings{ducoste_ortiz_2002, title={Characterization of drinking water treatment chemical mixing performance using CFD}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-23844485284&partnerID=MN8TOARS}, booktitle={Conference Proceedings - Joint 2002 CSCE/ASCE International Conference on Environmental Engineering - An International Perspective on Environmental Engineering}, author={Ducoste, J.J. and Ortiz, V.}, year={2002}, pages={427–443} }
 @inproceedings{hopkins_ducoste_2002, title={Characterizing The Spatial Variation In Particle Aggregation Due To Heterogeneous Turbulence In A Flocculation Reactor}, author={Hopkins, C. and Ducoste, J.J.}, year={2002} }
 @inproceedings{jin_ducoste_linden_2002, title={Determination of fluence rate distribution in UV reactors using spherical actinometry and mathematical analysis approaches}, booktitle={Proceedings American Water Works Association WQTC Conference}, author={Jin, S. and Ducoste, J.J. and Linden, K.G.}, year={2002} }
 @inproceedings{ducoste_liu_linden_2002, title={Modeling Drinking Water UV Disinfection Reactors using PHOENICS: Comparison between Eulerian and Lagrangian Approach}, booktitle={Proceedings, Phoenics User Conference}, author={Ducoste, J.J. and Liu, D. and Linden, K.}, year={2002} }
 @article{peplinski_ducoste_2002, title={Modeling of disinfection contactor hydraulics under uncertainty}, volume={128}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036849140&partnerID=MN8TOARS}, DOI={10.1061/(asce)0733-9372(2002)128:11(1056)}, abstractNote={A study has been done to evaluate the predictive capabilities of computational fluid dynamics (CFD) models of disinfection contactor hydraulics under model input uncertainty. The study consists of modeling the transport of a chemical tracer in a full-scale reactor and predicting the effluent residence time distribution (RTD) curve. An uncertainty analysis using Monte Carlo probabilistic techniques was used to determine the sensitivity of the effluent RTD to uncertainty in the influent turbulent kinetic energy constant, the turbulent Schmidt number, the wall roughness height, the influent turbulent length scale, and the turbulence model selection. Kruskal–Wallis, Friedman, and Spearman Rho statistical tests were used to evaluate changes in \iT\D10\N/HRT and Morril index due to input uncertainties. The results show that there are some variations in the effluent RTD due to changes in the model input parameters. The effluent RTD variations increased with decreasing contactor hydraulic efficiency or increased mixing. The effluent RTD was most sensitive to uncertainty in the turbulent Schmidt number and the selected turbulence model.}, number={11}, journal={Journal of Environmental Engineering (New York, N.Y.)}, author={Peplinski, D. K. and Ducoste, J.}, year={2002}, pages={1056–1067} }
 @article{doby_loughlin_reyes_ducoste_2002, title={Optimization of activated sludge designs using genetic algorithms}, volume={45}, ISSN={["0273-1223"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000175103800019&KeyUID=WOS:000175103800019}, DOI={10.2166/wst.2002.0106}, abstractNote={We describe a framework in which a genetic algorithm (GA) and a static activated sludge (AS) treatment plant design model (WRC AS model) are used to identify low cost activated sludge designs that meet specified effluent limits (e.g. for BOD, N, and P). Once the user has chosen a particular process (Bardenpho, Biodenipho, UCT or SBR), this approach allows the parameterizations for each AS unit process to be optimized systematically and simultaneously. The approach is demonstrated for a wastewater treatment plant design problem and the GA-based performance is compared to that of a classical nonlinear optimization approach. The use of GAs for multiobjective problems such as AS design is demonstrated and their application for reliability-based design and alternative generation is discussed.}, number={6}, journal={WATER SCIENCE AND TECHNOLOGY}, author={Doby, TA and Loughlin, DH and Reyes, FL and Ducoste, JJ}, year={2002}, pages={187–198} }
 @book{optimization of activated sludge designs using genetic algorithms_2002, volume={45}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0036219345&partnerID=MN8TOARS}, number={6}, journal={Water Science and Technology}, year={2002}, pages={187–198} }
 @inproceedings{doby_loughlin_de los reyes_ducoste_2002, title={Use of Design Scenarios and Chance-Constrained Genetic Algorithm for Wastewater Treatment Plant Design}, booktitle={Environmental & Water Resources Systems, Analysis (EWRSA) Symposium, in conjunction with the Water EWRI Conference}, author={Doby, T. and Loughlin, D. and de los Reyes, F. and Ducoste, J.J.}, year={2002} }
 @misc{ducoste_2001, title={An Overview of Computational Fluid Dynamics Modeling for Evaluation of Water and Wastewater Treatment Process Performance}, author={Ducoste, J.J.}, year={2001} }
 @book{carlson_bellamy_ducoste_amy_2001, place={Denver, CO}, title={Implementation of the Integrated Disinfection Design Framework}, institution={American Water Works Association Research Foundation}, author={Carlson, K.H. and Bellamy, W. and Ducoste, J. and Amy, G.}, year={2001} }
 @inproceedings{loughlin_doby_ducoste_de los reyes_2001, place={Reston, VA}, title={System-Wide Optimization of Wastewater Treatment Plants Using Genetic Algorithms}, volume={111}, url={http://dx.doi.org/10.1061/40569(2001)106}, DOI={10.1061/40569(2001)106}, booktitle={Bridging the gap : meeting the world's water and environmental resources challenges : proceedings of World Water and Environmental Resources Congress 2001, May 20-24, 2001, Orlando, Florida, USA}, publisher={American Society of Civil Engineers}, author={Loughlin, Daniel H. and Doby, Troy A. and Ducoste, Joel J. and de los Reyes, Francis L., III}, year={2001}, month={May} }
 @article{ducoste_carlson_bellamy_2001, title={The integrated disinfection design framework approach to reactor hydraulics characterization}, volume={50}, ISSN={["1365-2087"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0034888892&partnerID=MN8TOARS}, DOI={10.2166/aqua.2001.0021}, abstractNote={The integrated disinfection design framework (IDDF) is a new approach to determine disinfection requirements for drinking water treatment facilities. The framework may be applied to enhance or improve disinfection performance in lieu of using the surface water treatment rule (SWTR) Guidance Manual. The overall IDDF approach consists of four modules: hydraulic characterization, disinfectant demand/decay, inactivation kinetics, and disinfection by-product (DBP) formation. In this study, a review of the hydraulic characterization module is presented. The module was applied to two full-scale water treatment plant processes (1: a group of six filter beds, 2: a disinfection contactor). The data from the hydraulic characterization module, which consists of three methods to generate the residence time distribution (RTD) curve, was then used to demonstrate the microbial inactivation and DBP formation level that might be produced at the process effluent. Results suggest that the predicted microbial inactivation level is sensitive to the hydraulic characterization method. However, all three methods predict very similar DBP formation despite differences in the RTD data. Results also showed that the disinfectant dose applied to the contactor could be reduced by 35% and still maintain the same credit for Giardia inactivation specified by the USEPA CT tables. This reduction in disinfectant dose could result in a reduction in the total trihalomethane (TTHM) level by 10% and haloacetic acids (HAAs) by 20%.}, number={4}, journal={JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA}, author={Ducoste, J and Carlson, K and Bellamy, W}, year={2001}, month={Aug}, pages={245–261} }
 @article{bellamy_carlson_pier_ducoste_carlson_2000, title={Determining disinfection needs}, volume={92}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033703526&partnerID=MN8TOARS}, DOI={10.1002/j.1551-8833.2000.tb08943.x}, abstractNote={The integrated disinfection design framework can help utilities lower disinfectant dosages and costs and minimize formation of disinfection by‐products.}, number={5}, journal={Journal (American Water Works Association)}, author={Bellamy, W. and Carlson, K. and Pier, D. and Ducoste, J. and Carlson, M.}, year={2000}, pages={44–52} }
 @misc{ducoste_2000, title={IDDF Approach to Enhanced Reactor Hydraulic Characterization}, author={Ducoste, J.J.}, year={2000} }
 @misc{ducoste_2000, title={Modeling Flocculation in Water Treatment Processes: Impact of Tank Size and Impeller Configuration}, author={Ducoste, J.J.}, year={2000} }
 @inproceedings{terry_ducoste_2000, title={Modeling density current events in drinking water sedimentation processes using CFD}, booktitle={Proceedings NCAWWA/WEA Conference}, author={Terry, S.D. and Ducoste, J.J.}, year={2000} }
 @misc{ducoste_2000, title={Water Scarcity in the 21st Century: Has Time Come for Water Reuse}, author={Ducoste, J.J.}, year={2000} }
 @inproceedings{ducoste_carlson_bellamy_carlson_1999, title={A Systematic Approach to Reactor Hydraulic Characterization: Part 1 of the Integrated Disinfection Design Framework Protocol}, booktitle={Proceedings AWWA Water Quality and Technology Conference}, author={Ducoste, J.J. and Carlson, K. and Bellamy, W, and Carlson, M.}, year={1999} }
 @inproceedings{ducoste_brauer_1999, place={Reston, VA}, title={Computational Fluid Dynamics Model of WTP Clearwell: Evaluation of Critical Parameters Influencing Model Performance}, booktitle={Environmental engineering, 1999 : proceedings of ASCE-CSCE National Conference on Environmental Engineering}, publisher={American Society of Civil Engineers}, author={Ducoste, J.J. and Brauer, R.}, year={1999} }
 @inproceedings{ducoste_malmrose_weil_beacham_1999, title={Determining Design Criteria for New WTP Solids Handling Facility}, author={Ducoste, J.J. and Malmrose, P. and Weil, G. and Beacham, T.}, year={1999} }
 @inproceedings{peplinski_ducoste_1999, title={Enhancement of Computational Fluid dynamics (CFD) Modeling of Clearwell Performance}, booktitle={Proceedings}, author={Peplinski, D. and Ducoste, J.J.}, year={1999} }
 @inproceedings{ducoste_daigger_smith_1999, title={Evaluation of Stacked Secondary Clarifier Design using Computational Fluid Dynamics}, booktitle={Proceedings Water Environment Federation Technology Conference}, author={Ducoste, J.J. and Daigger, G.T. and Smith, R.}, year={1999} }
 @inproceedings{carlson_bellamy_pier_ducoste_carlson_1999, title={Implementation of the Integrated Disinfection Design Framework}, booktitle={Proceedings American Water Works Association National Conference}, author={Carlson, K.H. and Bellamy, W. and Pier, D. and Ducoste, J. and Carlson, M.}, year={1999} }
 @article{ducoste_clark_1999, title={Turbulence in flocculators: Comparison of measurements and CFD simulations}, volume={45}, ISSN={["0001-1541"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0033083186&partnerID=MN8TOARS}, DOI={10.1002/aic.690450222}, abstractNote={constant). These results help explain the variation in flocculation per- formance in different scale systems or in same scale systems with different impeller geometries. However, the experimen- tal methods used to measure the fluid mechanics require so- phisticated and expensive equipment and a dedicated labora- tory. In recent years, major advances in computer technology and computational mechanics have made it possible to use com- putational fluid dynamics (CFD) to analyze flows. The intent of this study was to evaluate the effectiveness of a commer- cial CFD code in modeling flocculator fluid mechanics.}, number={2}, journal={AICHE JOURNAL}, author={Ducoste, JJ and Clark, MM}, year={1999}, month={Feb}, pages={432–436} }
 @book{crozes_hagstrom_clark_ducoste_burns_1998, place={Denver, CO}, title={Improving Clearwell Design for CT Compliance}, institution={American Water Works Association Research Foundation}, author={Crozes, G. and Hagstrom, J.P. and Clark, M.M. and Ducoste, J.J. and Burns, C.}, year={1998} }
 @article{ducoste_clark_1998, title={The influence of tank size and impeller geometry on turbulent flocculation: I. Experimental}, volume={15}, ISSN={["1092-8758"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0031713973&partnerID=MN8TOARS}, DOI={10.1089/ees.1998.15.215}, abstractNote={ABSTRACT The effects of tank size and impeller geometry on the particle size distribution after 30 min of flocculation at constant characteristic average velocity gradient, Gm, were studied. Flocculation was performed in three square tanks 5-, 28-, and 560-L volume with Rushton turbines and A310 fluid foil impellers. The floc size was recorded in situ using a photographic technique, and the resulting photographs were analyzed with an image analysis system. The results show that the cumulative particle size distribution shifts to a smaller particle size range with increasing tank size, regardless of impeller type. A similar shift in the cumulative particle size distribution was observed when the impeller type was switched from the A310 fluid foil to the Rushton turbine, regardless of tank size. The volume mean floc size, floc standard deviation, and maximum stable floc size were found to be controlled by the turbulence intensity in the impeller discharge zone and not by Gm. Key words: Tank size; impeller g...}, number={3}, journal={ENVIRONMENTAL ENGINEERING SCIENCE}, author={Ducoste, JJ and Clark, MM}, year={1998}, pages={215–224} }
 @article{ducoste_clark_1998, title={The influence of tank size and impeller geometry on turbulent flocculation: II. Model}, volume={15}, ISSN={["1092-8758"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0031695482&partnerID=MN8TOARS}, DOI={10.1089/ees.1998.15.225}, abstractNote={ABSTRACT A population balance model has been developed to simulate the dynamics of particle agglomeration and breakup during flocculation in turbulent flow. The model was used to simulate flocculation in three square tanks of 5-, 28-, and 560-L volume with Rushton turbines and A310 fluid foil impellers. The average power per unit volume, Gm, was set at 40 s−1 for all tank/impeller configurations. The numerical results show that the model predicts the shift in the cumulative particle-size distribution to a smaller particle-size range with increasing tank size, regardless of impeller type. The model also predicts the shift in the cumulative particle size distribution to a smaller particle-size range moving from the A310 fluid foil impeller to the Rushton turbine. Model sensitivity to tank size and impeller geometry was accomplished by incorporating the turbulence intensity in the impeller discharge zone in the breakup part of the population balance model. Key words: tank size; impeller geometry; turbulent f...}, number={3}, journal={ENVIRONMENTAL ENGINEERING SCIENCE}, author={Ducoste, JJ and Clark, MM}, year={1998}, pages={225–235} }
 @inproceedings{ducoste_clark_1997, title={The Influence of Tank Size and Impeller Type on Floc Size Distribution}, booktitle={Proceedings of the American Water Works Association National Conference}, author={Ducoste, J.J. and Clark, M.M.}, year={1997} }
 @inproceedings{hagstrom_crozes_reddy_verghes_clark_ducoste_burns_1997, title={The Use of Computational Fluid Dynamics for Improving Clearwell Design for CT Compliance}, booktitle={Proceedings of the American Water Works Association Computer Conference}, author={Hagstrom, J.P. and Crozes, G. and Reddy, S. and Verghes, V. and Clark, M.M. and Ducoste, J.J. and Burns, C.}, year={1997} }
 @article{ducoste_clark_weetman_1997, title={Turbulence in flocculators: Effects of tank size and impeller type}, volume={43}, ISSN={0001-1541 1547-5905}, url={http://dx.doi.org/10.1002/aic.690430206}, DOI={10.1002/aic.690430206}, abstractNote={Abstract}, number={2}, journal={AIChE Journal}, publisher={Wiley}, author={Ducoste, Joel J. and Clark, Mark M. and Weetman, Ronald J.}, year={1997}, month={Feb}, pages={328–338} }
 @inproceedings{clark_ducoste_1996, title={A Journey in Understanding Mixing and Flocculation}, booktitle={Proceedings of the American Water Works Association Virginia Section}, author={Clark, M.M. and Ducoste, J.J.}, year={1996} }
 @inproceedings{crozes_hagstrom_clark_ducoste_hermanowicz_huntamer_1996, title={Hydraulic Modeling for Improved CT Contactor Design}, booktitle={Proceedings of the American Water Works Association Annual Conference}, author={Crozes, G. and Hagstrom, J.P. and Clark, M.M. and Ducoste, J.J. and Hermanowicz, S.W. and Huntamer, J.}, year={1996} }
 @inproceedings{ducoste_clark_weetman_1995, title={The Evaluation of the Fluid Mechanics Generated in the Flocculation Process: Effects of Tank Size and Impeller Type}, booktitle={Proceedings of the American Water Works Association National Conference}, author={Ducoste, J.J. and Clark, M.M. and Weetman, R.J.}, year={1995} }
 @inproceedings{ducoste_derby_1990, title={Docking assembly end effector for a two arm robot}, volume={26}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-0025685742&partnerID=MN8TOARS}, booktitle={American Society of Mechanical Engineers, Design Engineering Division (Publication) DE}, author={Ducoste, Joel and Derby, Stephen J.}, year={1990}, pages={271–278} }
 @misc{gallimore_ducoste, title={Assessment of Grease Abatement Systems}, author={Gallimore, E. and Ducoste, J.J.} }
 @misc{chiang_sederoff_ralph_ducoste_isik_williams_muddiman, title={Lignin proteome, metabolome, enzymology, biochemistry, transgenics, structural chemistry, and systems modeling}, author={Chiang, Vincent and Sederoff, Ron and Ralph, John and Ducoste, Joel and Isik, Fikret and Williams, Cranos and Muddiman, David} }