@article{mota_head_williams_eland_cheng_reyes_2014, title={Structural integrity affects nitrogen removal activity of granules in semi-continuous reactors}, volume={25}, ISSN={["1572-9729"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84907062953&partnerID=MN8TOARS}, DOI={10.1007/s10532-014-9712-3}, number={6}, journal={BIODEGRADATION}, publisher={Springer Science \mathplus Business Media}, author={Mota, Cesar R. and Head, Melanie A. and Williams, Jon C. and Eland, Lucy and Cheng, Jay J. and Reyes, Francis L., III}, year={2014}, month={Nov}, pages={923–934} }
 @article{mota_head_ridenoure_cheng_reyes_2005, title={Effects of aeration cycles on nitrifying bacterial populations and nitrogen removal in intermittently aerated reactors}, volume={71}, ISSN={["1098-5336"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-29144451509&partnerID=MN8TOARS}, DOI={10.1128/AEM.71.12.8565-8572.2005}, abstractNote={ABSTRACT
          
            The effects of the lengths of aeration and nonaeration periods on nitrogen removal and the nitrifying bacterial community structure were assessed in intermittently aerated (IA) reactors treating digested swine wastewater. Five IA reactors were operated in parallel with different aeration-to-nonaeration time ratios (ANA). Populations of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) were monitored using 16S rRNA slot blot hybridizations. AOB species diversity was assessed using
            amoA
            gene denaturant gradient gel electrophoresis.
            Nitrosomonas
            and
            Nitrosococcus mobilis
            were the dominant AOB and
            Nitrospira
            spp. were the dominant NOB in all reactors, although
            Nitrosospira
            and
            Nitrobacter
            were also detected at lower levels. Reactors operated with the shortest aeration time (30 min) showed the highest
            Nitrosospira
            rRNA levels, and reactors operated with the longest anoxic periods (3 and 4 h) showed the lowest levels of
            Nitrobacter
            , compared to the other reactors.
            Nitrosomonas
            sp. strain Nm107 was detected in all reactors, regardless of the reactor's performance. Close relatives of
            Nitrosomonas europaea
            ,
            Nitrosomonas
            sp. strain ENI-11, and
            Nitrosospira multiformis
            were occasionally detected in all reactors. Biomass fractions of AOB and effluent ammonia concentrations were not significantly different among the reactors. NOB were more sensitive than AOB to long nonaeration periods, as nitrite accumulation and lower total NOB rRNA levels were observed for an ANA of 1 h:4 h. The reactor with the longest nonaeration time of 4 h performed partial nitrification, followed by denitrification via nitrite, whereas the other reactors removed nitrogen through traditional nitrification and denitrification via nitrate. Superior ammonia removal efficiencies were not associated with levels of specific AOB species or with higher AOB species diversity.
          }, number={12}, journal={APPLIED AND ENVIRONMENTAL MICROBIOLOGY}, author={Mota, C and Head, MA and Ridenoure, JA and Cheng, JJ and Reyes, FL}, year={2005}, month={Dec}, pages={8565–8572} }
 @article{mota_ridenoure_cheng_reyes_2005, title={High levels of nitrifying bacteria in intermittently aerated reactors treating high ammonia wastewater}, volume={54}, ISSN={["1574-6941"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-26244460968&partnerID=MN8TOARS}, DOI={10.1016/j.femsec.2005.05.001}, abstractNote={Changes in the fractions of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in two laboratory-scale reactors were investigated using 16S rRNA probe hybridizations. The reactors were operated in intermittent aeration mode and different aeration cycles to treat anaerobically digested swine wastewater with ammonia concentrations up to 175 mg NH3-N/L. High ammonia removals (>98.8%) were achieved even with increased nitrogen loads and lower aeration: non-aeration time ratios of 1 h:3 h. Nitrosomonas/Nitrosococcus mobilis were the dominant ammonia-oxidizing bacteria in the reactors. Nitrospira-like organisms were the dominant nitrite-oxidizing bacteria during most of the investigation, but were occasionally outcompeted by Nitrobacter. High levels of nitrifiers were measured in the biomass of both reactors, and ammonia-oxidizing bacteria and nitrite-oxidizing bacterial levels adjusted to changing aeration: non-aeration time ratios. Theoretical ammonia-oxidizer fractions, determined by a mathematical model, were comparable to the measured values, although the measured biomass fractions were different at each stage while the theoretical values remained approximately constant. Stable ammonia removals and no nitrite accumulation were observed even when rRNA levels of ammonia oxidizers and nitrite-oxidizers reached a minimum of 7.2% and 8.6% of total rRNA, respectively. Stable nitrogen removal performance at an aeration: non-aeration ratio of 1 h:3 h suggests the possibility of significant savings in operational costs.}, number={3}, journal={FEMS MICROBIOLOGY ECOLOGY}, author={Mota, C and Ridenoure, J and Cheng, JY and Reyes, FL}, year={2005}, month={Nov}, pages={391–400} }
 @inproceedings{head_mota_ridenoure_reyes f. l._cheng_2005, title={Intermittent aeration for nitrogen removal from high-ammonia wastewater through nitrification and denitrification in a single reactor}, booktitle={2005 Animal Waste Management Symposium (Research Triangle, NC)}, author={Head, M. A. and Mota, C. R. and Ridenoure, J. A., III and Reyes F. L. and Cheng, J. J.}, year={2005} }
 @inproceedings{head_mota_ridenoure_l._cheng_2005, title={Nitrogen Removal from Anaerobically Pretreated Swine Wastewater in an Intermittent Aeration Process}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-70349157669&partnerID=MN8TOARS}, DOI={10.13031/2013.19488}, abstractNote={Intermittent aeration (IA) process was investigated for nitrogen removal from anaerobically pretreated 
swine wastewater (APTSW) that contained a high concentration of ammonium (average 265 mgNH4- 
N/l) and a low sCOD (soluble chemical oxygen demand)/N ratio (average 1.4). Nitrogen removal from the 
APTSW was achieved through nitrification and denitrification in a single, semi-continuously fed reactor that was 
operated with alternation of aeration and non-aeration at room temperature (23oC). To optimize the IA 
process, different Aeration:Non-Aeration (ANA) ratios and cycle lengths were used in the reactors as follows: 
Reactor A, l hour : 1 hour; Reactor B, 1 hour : 3 hours; Reactor C, 0.5 hour : 1.5 hours; Reactor D, 0.5 hour : 2 
hour; Reactor E, 1 hour : 4 hours; Reactor F, 1 hour : 5 hours; and Reactor G, 1 hour : 6 hours. The hydraulic 
retention time (HRT) and mean cell residence time (MCRT) for the reactors were 3 and 20 days, respectively. 
Over 79 % ammonium was removed in all of the reactors. The reactor with the highest ANA ratio (Reactor A) 
achieved the highest NH3-N removal (99%), while the reactor with the longest non-aeration period (Reactor F) 
achieved the highest total nitrogen removal (83%). It was found that nitrogen removal was achieved through 
nitrate denitrification in Reactors A, B, C, and D, but it was via nitrite reduction in Reactors E and F. The high 
nitrogen removal efficiency indicated that the required organic carbon must have been obtained from the 
solubilization of solids contained in the influent or from microbial decay byproducts. The substantially higher 
denitrification rates observed in Reactors E and F were likely due to the decreased sCOD requirements for 
nitrogen removal via nitrite versus those required via nitrate.}, booktitle={2005 Tampa, FL July 17-20, 2005}, publisher={American Society of Agricultural and Biological Engineers (ASABE)}, author={Head, M. A. and Mota, C. R. and Ridenoure, J. A. and L., Reyes F. and Cheng, J. J.}, year={2005} }
 @inproceedings{head_williams_mota_reyes f. l._cheng_2005, title={Nitrogen removing activity of granules in intermittent aeration reactors treating high-ammonia wastewater}, booktitle={4th International Water Association Specialized Conference on Microorganisms in Activated Sludge and Biofilm Systems (Gold Coast, Australia)}, author={Head, M. A. and Williams, J. C. and Mota, C. R., III and Reyes F. L. and Cheng, J. J.}, year={2005} }
 @article{head_ridenoure_mota_reyes f. l._cheng_2005, title={Using intermittent aeration to remove nitrogen from swine wastewater}, volume={4}, number={4}, journal={Industrial Wastewater}, author={Head, M. A. and Ridenoure, J. A. and Mota, C. R., III and Reyes F. L. and Cheng, J. J.}, year={2005}, pages={9–12} }
 @inproceedings{mota_ridenoure_cheng_reyes f. l._2004, title={Effects of aeration cycles on populations of nitrifying bacteria and nitrogen removal in intermittently-aerated reactors}, booktitle={77th Annual Technical Exhibition and Conference : the water quality event : Ernest N. Morial Convention Center, New Orleans, Louisiana, USA, October 2-6, 2004}, author={Mota, C. R. and Ridenoure, J. A. and Cheng, J. and Reyes F. L.}, year={2004} }
 @inproceedings{ridenoure_head_mota_reyes f. l._cheng_2004, title={Optimization of intermittent aeration for nitrogen removal from swine wastewater}, booktitle={77th Annual Technical Exhibition and Conference : the water quality event : Ernest N. Morial Convention Center, New Orleans, Louisiana, USA, October 2-6, 2004}, author={Ridenoure, J. A. and Head, M. A. and Mota, C. R. and Reyes F. L. and Cheng, J.}, year={2004} }
 @inproceedings{mota_hu_cheng_reyes f. l._2003, title={Detection of unusually high levels of nitrifying bacteria in reactors treating high nitrogen wastewater}, ISBN={1555812732}, booktitle={American Society for Microbiology 103rd General Meeting, May 18-22, 2003, Washington, D.C}, author={Mota, C. R. and Hu, Z. and Cheng, J. and Reyes F. L.}, year={2003} }
 @inproceedings{hu_mota_reyes f. l._cheng_2003, title={Optimization of nitrogen removal from anaerobically-pretreated swine wastewater in intermittent aeration tanks}, volume={9}, ISBN={1892769328}, booktitle={Animal, Agricultural and Food Processing Wastes IX : proceedings of the Ninth International Symposium, 12-15 October, 2003, Raleigh, North Carolina}, author={Hu, Z. and Mota, C. R., III and Reyes F. L. and Cheng, J.}, year={2003} }
 @inproceedings{mota_hu_cheng_reyes f. l._2003, title={Population dynamics of nitrifying bacteria in intermittently-aerated reactors treating high nitrogen wastewater}, booktitle={WEFTEC.03 : Conference Program & Exhibitor Guide : 76th Annual Technial Exhibition and Conference : the water quality event : Los Angeles, October 11-15, 2003, Los Angeles Convention Center}, author={Mota, C. R. and Hu, Z. and Cheng, J. and Reyes F. L.}, year={2003} }
 @inproceedings{mota_cheng_reyes f. l._2003, title={Quantifying nitrifying bacteria in bioreactors treating swine wastewater}, booktitle={2003 Quad Conference (Blacksburg, VA)}, author={Mota, C. R. and Cheng, J. and Reyes F. L.}, year={2003} }