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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front.Environ.Sci.Eng.    2014, Vol. 8 Issue (4) : 589-597    https://doi.org/10.1007/s11783-013-0571-7
RESEARCH ARTICLE
Production of N2O in two biologic nitrogen removal processes: a comparison between conventional and short-cut Nitrogen removal processes
Youkui GONG1,2,*(),Yongzhen PENG2,Shuying WANG2,Sai WANG2
1. Shijiazhuang Institute of Railway Technology, Shijiazhuang 050061, China
2. School of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China
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Abstract

The N2O production in two nitrogen removal processes treating domestic wastewater was investigated in laboratory-scale aerobic-anoxic sequencing batch reactors (SBRs). Results showed that N2O emission happened in the aerobic phase rather than in the anoxic phase. During the aerobic phase, the nitrogen conversion to N2O gas was 27.7% and 36.8% of NH4+N loss for conventional biologic N-removal process and short-cut biologic N-removal process. The dissolved N2O was reduced to N2 in the anoxic denitrification phase. The N2O production rate increased with the increasing of nitrite concentration and ceased when NH4+N oxidation was terminated. Higher nitrite accumulation resulted in higher N2O emission in the short-cut nitrogen removal process. Pulse-wise addition of 20 mg NO2-NL-1 gave rise to 3-fold of N2O emission in the conventional N-removal process, while little change happened with 20 mg NO3-NL-1 was added to SBR1.

Keywords conventional N-removal process      N2O      short-cut N-removal process      nitrite accumulation      ammonia- oxidizing bacteria (AOB) denitrification     
Corresponding Author(s): Youkui GONG   
Issue Date: 11 June 2014
 Cite this article:   
Youkui GONG,Yongzhen PENG,Shuying WANG, et al. Production of N2O in two biologic nitrogen removal processes: a comparison between conventional and short-cut Nitrogen removal processes[J]. Front.Environ.Sci.Eng., 2014, 8(4): 589-597.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0571-7
https://academic.hep.com.cn/fese/EN/Y2014/V8/I4/589
Fig.1  Schematic diagram of experimental system
Fig.2  Dynamics of NH4+-N, NO2--N, NO3--N, COD, pH and DO in a cycle of (a) conventional nitrogen removal process (b)short-cut nitrogen removal process
Fig.3  N2O production in a cycle of (a) conventional N removal process, (b) short-cut N-removal process
Fig.4  N2O production rates of conventional and shortcut N removal process
Fig.5  Nitrogen content of aerated wastewater, expressed as the percentage of the total nitrogen content in the raw wastewater
Fig.6  NH4+-N, NO2--N, NO3--N, N2O emission and the ratio of N2O to total N forms in a typical cycle of conventional N removal process with pulse addition NOx--N ((a): nitrate addition (b): nitrite addition)
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