@misc{kjeldsen_barlaz_rooker_baun_ledin_christensen_2002, title={Present and long-term composition of MSW landfill leachate: A review}, volume={32}, ISSN={["1547-6537"]}, DOI={10.1080/10643380290813462}, abstractNote={The major potential environmental impacts related to landfill leachate are pollution of groundwater and surface waters. Landfill leachate contains pollutants that can be categorized into four groups (dissolved organic matter, inorganic macrocomponents, heavy metals, and xenobiotic organic compounds). Existing data show high leachate concentrations of all components in the early acid phase due to strong decomposition and leaching. In the long methanogenic phase a more stable leachate, with lower concentrations and a low BOD/COD-ratio, is observed. Generally, very low concentrations of heavy metals are observed. In contrast, the concentration of ammonia does not decrease, and often constitutes a major long-term pollutant in leachate. A broad range of xenobiotic organic compounds is observed in landfill leachate. The long-term behavior of landfills with respect to changes in oxidation-reduction status is discussed based on theory and model simulations. It seems that the somewhere postulated enhanced release of accumulated heavy metals would not take place within the time frames of thousands of years. This is supported by a few laboratory investigations. The existing data and model evaluations indicate that the xenobiotic organic compounds in most cases do not constitute a major long-term problem. This may suggest that ammonia will be of most concern in the long run.}, number={4}, journal={CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY}, author={Kjeldsen, P and Barlaz, MA and Rooker, AP and Baun, A and Ledin, A and Christensen, TH}, year={2002}, pages={297–336} }
 @inproceedings{barlaz_gabr_hossain_rooker_kjeldsen_2001, title={Closing gaps in the regulation of MSW landfills: Defining the end of the post-closure monitoring period and the future stability of leachate recirculation landfills}, booktitle={Waste Tech 2001 :  February 11 - 14, 2001, Hyatt Islandia, San Diego, CA}, author={Barlaz, M. A. and Gabr, M. A. and Hossain, S. and Rooker, A. and Kjeldsen, P.}, year={2001} }
 @article{scheutz_winther_kjeldsen_2000, title={Removal of halogenated organic compounds in landfill gas by top covers containing zero-valent iron}, volume={34}, ISSN={["1520-5851"]}, DOI={10.1021/es991301f}, abstractNote={Transformation of gaseous CCl3F and CCl4 by zero-valent iron was studied in systems unsaturated with water under anaerobic conditionsin an N2 gas and in a landfill gas atmosphere. The transformation was studied in batch as well as flow-through column tests. In both systems, the transformation process of the compounds was pseudo-first-order. Transformation rate constants, referring to the water phase and normalized to 1 m2 iron surface/mL, of up to 1100 mL m-2 h-1 (batch) and 200 mL m-2 h-1 (flow-through) were found. The transformation was strongly dependent on pH and the presence of oxygen. During continuous aerobic conditions, the transformation of CCl3F decreased toward zero. Model calculations show that use of zero-valent iron in landfill top covers is a potential treatment technology for emission reduction of halogenated trace compounds from landfills.}, number={12}, journal={ENVIRONMENTAL SCIENCE & TECHNOLOGY}, author={Scheutz, C and Winther, K and Kjeldsen, P}, year={2000}, month={Jun}, pages={2557–2563} }