title: N2O emission from nitrogen removal via nitrite in oxic-anoxic granular sludge sequencing batch reactor.
abstract: Bionitrification is considered to be a potential source of nitrous oxide (N2O) emissions, which are produced as a by-product during the nitrogen removal process. To investigate the production of N2O during the process of nitrogen removal via nitrite, a granular sludge was studied using a lab-scale sequence batch reactor operated with real-time control. The total production of N2O generated during the nitrification and denitrification processes were 1.724 mg/L and 0.125 mg/L, respectively, demonstrating that N2O is produced during both processes, with the nitrification phase generating larger amount. In addition, due to the N2O-N mass/oxidized ammonia mass ratio, it can be concluded that nitrite accumulation has a positive influence on N2O emissions. Results obtained from PCR-DGGE analysis demonstrate that a specific Nitrosomonas microorganism is related to N2O emission.
authors: School of Forestry, Northeast Forestry University, Harbin 150040, China.
authors: Hong
authors: H
authors: Liang
authors: School of Forestry, Northeast Forestry University, Harbin 150040, China.
authors: Jiaoling
authors: J
authors: Yang
authors: School of Forestry, Northeast Forestry University, Harbin 150040, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: gaodw@nefu.edu.cn.
authors: Dawen
authors: D
authors: Gao
mesh_terms: D019149:Bioreactors / Q000382:microbiology; D058440:Denitrification; D058465:Nitrification; D009573:Nitrites / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism; D009606:Nitrosomonas / Q000378:metabolism*; D009609:Nitrous Oxide / Q000032:analysis / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry*
chemical_list: D009573:Nitrites; D012722:Sewage; D009609:Nitrous Oxide; D009584:Nitrogen
keywords: biological nitrogen removal; nitrification and denitrification; nitrite accumulation; nitrous oxide; wastewater treatment