title: Integration of denitrifying phosphorus removal via nitrite pathway, simultaneous nitritation-denitritation and anammox treating carbon-limited municipal sewage.
abstract: High nutrients removal above 90% from carbon-limited municipal sewage was obtained without adding external carbon source. Achieving nitritation was a prerequisite to improve nutrients removal. Denitrifying phosphorus (P) removal using nitrite as electron acceptor was the key pathway in anoxic zone, where nitrogen removal reached above 60% and average denitrifying P removal was 88%. Simultaneous nitritation/denitritation and anaerobic ammonia oxidation (anammox) possibly contributed to nitrogen removal of 26-36% in aerobic zone. Quantitative PCR assays presented that the abundance of anammox bacteria under nitritation was more than that under complete nitrification. The largest amount of anammox bacteria was 1.32×10(6)copies/gVSS, about 5.6 times increase over a period of 255days. Nitrite concentration of 17mg/L in aerobic zone inhibited anammox bacteria. Quantitative results suggested possible occurrence of anammox. Based on performance of nitritation, combining heterotrophic denitrification with autotrophic nitrogen removal is an effective strategy to improve nutrients removal from carbon-limited wastewater.
authors.affiliation: Key Laboratory of Beijing for Water Environment Recovery, Department of Environmental Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: zengwei_1@263.net.
authors.forename: Wei
authors.initials: W
authors.lastname: Zeng
authors.affiliation: Key Laboratory of Beijing for Water Environment Recovery, Department of Environmental Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Boxiao
authors.initials: B
authors.lastname: Li
authors.affiliation: Key Laboratory of Beijing for Water Environment Recovery, Department of Environmental Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Beijing for Water Environment Recovery, Department of Environmental Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Xinlong
authors.initials: X
authors.lastname: Bai
authors.affiliation: Key Laboratory of Beijing for Water Environment Recovery, Department of Environmental Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
mesh_terms: D064751:Ammonium Compounds / Q000378:metabolism*; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D002244:Carbon / Q000378:metabolism*; D009111:Local Government; D058465:Nitrification; D009573:Nitrites / Q000378:metabolism*; D010758:Phosphorus / Q000302:isolation & purification* / Q000378:metabolism; D012722:Sewage / Q000382:microbiology*; D018511:Systems Integration; D018508:Water Purification / Q000379:methods*
chemical_list: D064751:Ammonium Compounds; D009573:Nitrites; D012722:Sewage; D010758:Phosphorus; D002244:Carbon
keywords: Anaerobic ammonia oxidation (anammox); Denitrifying phosphorus removal; Municipal sewage; Nitritation; Simultaneous nitritation and denitritation