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Mechanisms and differences of N2O emission characteristics in typical wastewater treatment processes
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Hui-ling CHEN, Lu QI*, Jia-bo CHEN, Zhi-heng XIA, Qian-gang LI, Zi-ding AO, Zhao JIANG, Tong-tong ZHANG, Hong-chen WANG, Guo-hua LIU
China Environmental Science | 2025, 45(2) : 718 - 726
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China Environmental Science | 2025, 45(2): 718-726
• Water Pollution Control •
Mechanisms and differences of N2O emission characteristics in typical wastewater treatment processes
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Hui-ling CHEN, Lu QI*, Jia-bo CHEN, Zhi-heng XIA, Qian-gang LI, Zi-ding AO, Zhao JIANG, Tong-tong ZHANG, Hong-chen WANG, Guo-hua LIU
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  • Research Center for Low Carbon Technology of Water Environment, School of chemistry and life resource, Renmin University of China, Beijing 100872, China
Published: 2025-02-20
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This study mainly compared the emission characteristics of N2O in two typical wastewater treatment processes, SBR and AAO, and analyzed the mechanisms that cause the differences.. The results indicated that according to the total nitrogen removal efficiency of the SBR process, the N2O emission factor (EF) was 2.36%, which is 1.92 times higher than that of the AAO process. The aerobic phase was identified as the primary stage for N2O production in both processes, accounting for over 90% of the total N2O generated. Compared to the continuously AAO process, the sequencing SBR process exhibited a longer duration of low DO conditions. A sudden increase in NH4+-N concentration o and a high accumulation of NO2--N ccurred at the onset of the aerobic phase. Analysis of the microbial community structure and enzyme activity revealed that SBR process had a higher ratio of ammonia-oxidizing bacteria (AOB) to nitrite-oxidizing bacteria (NOB) and a higher nitrite reductase (NOR) activity, which were 1.7 and 1.4 times those of the AAO process, respectively. This further facilitated the production of more N2O through the AOB-mediated nitrification-denitrification pathway during the aerobic phase, which is the intrinsic mechanism for the high N2O emission factor of the SBR process.

wastewater treatment  /  N2O  /  AAO  /  SBR  /  emission characteristics  /  mechanisms
Hui-ling CHEN, Lu QI, Jia-bo CHEN, Zhi-heng XIA, Qian-gang LI, Zi-ding AO, Zhao JIANG, Tong-tong ZHANG, Hong-chen WANG, Guo-hua LIU. Mechanisms and differences of N2O emission characteristics in typical wastewater treatment processes[J]. China Environmental Science, 2025 , 45 (2) : 718 -726 .
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Year 2025 volume 45 Issue 2
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  • Receive Date：2024-06-24
  • Online Date：2026-03-17
  • Published：2025-02-20
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  • Received：2024-06-24
Affiliations
    Research Center for Low Carbon Technology of Water Environment, School of chemistry and life resource, Renmin University of China, Beijing 100872, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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