title: Biological treatment of landfill leachate with the integration of partial nitrification, anaerobic ammonium oxidation and heterotrophic denitrification.
abstract: A biological treatment with the integration of partial nitrification, anaerobic ammonium oxidation (Anammox) and heterotrophic denitrification was successfully developed in a SBR with periodical air supply to treat landfill leachate. An operating temperature of 30+/-1 degrees C and a dissolved oxygen concentration within 1.0-1.5 mg/L were maintained in the SBR. First, the mixture of Anammox biomass and aerobic activated sludge (80% w/w) were inoculated, and inorganic synthetic wastewater with progressively increased N-loading was added. The activities of maximum aerobic ammonium oxidizing and anaerobic ammonium oxidizing reached 0.79 and 0.18(kg NH(4)(+)-N/kg(dw)/day) after the inoculation lasting 86 days, respectively. Secondly, an unexpected group of heterotrophic denitrifying bacteria was inoculated into the reactor along with the feeding of raw landfill leachate, and the final maximum activities of aerobic ammonium oxidizing, anaerobic ammonium oxidizing and denitrification reached 2.83 (kg NH(4)(+)-N/kg(dw)/day), 0.65 (kg NH(4)(+)-N/kg(dw)/day) and 0.11 (kg NO(3)(-)-N/kg(dw)/day), respectively.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
authors.forename: Zheng-Yong
authors.initials: ZY
authors.lastname: Xu
authors.forename: Guang-Ming
authors.initials: GM
authors.lastname: Zeng
authors.forename: Zhao-Hui
authors.initials: ZH
authors.lastname: Yang
authors.forename: Yong
authors.initials: Y
authors.lastname: Xiao
authors.forename: Ming
authors.initials: M
authors.lastname: Cao
authors.forename: Hong-Song
authors.initials: HS
authors.lastname: Sun
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Ji
authors.forename: Ying
authors.initials: Y
authors.lastname: Chen
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D009584:Nitrogen / Q000378:metabolism*; D010084:Oxidation-Reduction; D012037:Refuse Disposal / Q000295:instrumentation*; D012989:Soil Pollutants / Q000302:isolation & purification* / Q000378:metabolism*; D018511:Systems Integration; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism*
chemical_list: D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D009584:Nitrogen