title: N2O emission in short-cut simultaneous nitrification and denitrification process: dynamic emission characteristics and succession of ammonia-oxidizing bacteria.
abstract: A sequencing batch airlift reactor was used to investigate the characteristics of nitrous oxide (N2O) emission and the succession of an ammonia-oxidizing bacteria (AOB) community. The bioreactor could successfully switch from the complete simultaneous nitrification and denitrification (SND) process to the short-cut SND process by increasing the influent pH from 7.0-7.3 to 8.0-8.3. The results obtained showed that, compared with the complete SND process, the TN removal rate and SND efficiency were improved in the short-cut SND process by approximately 13 and 11%, respectively, while the amount of N2O emission was nearly three times larger than that in the complete SND process. The N2O emission was closely associated to nitrite accumulation. Analysis of the AOB microbial community showed that nitrifier denitrification by Nitrosomonas-like AOB could be an important pathway for the enhancement of N2O emission in the short-cut SND process.
authors: The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; and School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: pli@scut.edu.cn.
authors: Yingyan
authors: Y
authors: Yan
authors: The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; and School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: pli@scut.edu.cn.
authors: Ping
authors: P
authors: Li
authors: The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; and School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: pli@scut.edu.cn.
authors: Jinhua
authors: J
authors: Wu
authors: The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; and School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: pli@scut.edu.cn.
authors: Nengwu
authors: N
authors: Zhu
authors: The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; and School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: pli@scut.edu.cn.
authors: Pingxiao
authors: P
authors: Wu
authors: The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; and School of Environment and Energy, South China University of Technology, Guangzhou 510006, China E-mail: pli@scut.edu.cn.
authors: Xiangde
authors: X
authors: Wang
mesh_terms: D000641:Ammonia / Q000737:chemistry / Q000378:metabolism*; D064751:Ammonium Compounds / Q000737:chemistry / Q000378:metabolism*; D020562:Betaproteobacteria / Q000235:genetics / Q000378:metabolism*; D019149:Bioreactors; D058440:Denitrification; D058465:Nitrification; D009573:Nitrites / Q000737:chemistry*; D010084:Oxidation-Reduction; D010802:Phylogeny; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism; D018508:Water Purification
chemical_list: D064751:Ammonium Compounds; D009573:Nitrites; D014874:Water Pollutants, Chemical; D000641:Ammonia