[N2O Emission from the Processes of Wastewater Treatment: Mechanisms and Control Strategies]

Xiao-di Hao; Zhen-Li Yang; Wen-Bo Yu; Ran-Bin Liu

doi:10.13227/j.hjkx.202204041

[N₂O Emission from the Processes of Wastewater Treatment: Mechanisms and Control Strategies]

Huan Jing Ke Xue. 2023 Feb 8;44(2):1163-1173. doi: 10.13227/j.hjkx.202204041.

[Article in Chinese]

Authors

Xiao-di Hao¹, Zhen-Li Yang¹, Wen-Bo Yu¹, Ran-Bin Liu¹

Affiliation

¹ Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies, Key Laboratory of Urban Stormwater System and Water Environment (Ministry of Education), Beijing University of Civil Engineering and Architecture, Beijing 100044, China.

PMID: 36775638
DOI: 10.13227/j.hjkx.202204041

Abstract

As a direct carbon emission source, the amount of nitrous oxide (N₂, which is actually caused by AOB denitrification. To control the N₂O emission during biological N-removal, complete HND and NO₂^- accumulation for AOB denitrification should be avoided to a large extent. For this purpose, DO in aerobic tanks should be controlled at a normal level (approximately 2 mg·L^-1), and solid retention time (SRT) should be extended, up to 20 d, which would avoid accumulating N₂O for AOB denitrification. Additionally, external carbon should be supplemented in time to promote HDN approaching the end, N₂. This review summarizes the mechanisms of all the mentioned N₂O emission pathways and discusses the control strategies of N₂O emission according to the associated mechanisms.

Keywords: AOB simultaneous partial nitrification and its denitrification; biological nitrogen removal; carbon emissions; nitrification/denitrification; nitrous oxide (N2O); simultaneous nitrification/denitrification (SND).

Publication types

English Abstract