N<sub>2</sub>O EMISSION FROM MUNICIPAL WASTEWATER TREATMENT PLANTS: EMISSION CHARACTERISTICS AND CONTROL STRATEGIES

ZHANG Yili; LIU Hui; QIAN Xiaoyong

doi:10.13205/j.hjgc.202404002

Volume 42 Issue 4

Apr. 2024

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ZHANG Yili, LIU Hui, QIAN Xiaoyong. N2O EMISSION FROM MUNICIPAL WASTEWATER TREATMENT PLANTS: EMISSION CHARACTERISTICS AND CONTROL STRATEGIES[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(4): 9-21. doi: 10.13205/j.hjgc.202404002

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ZHANG Yili, LIU Hui, QIAN Xiaoyong. N₂O EMISSION FROM MUNICIPAL WASTEWATER TREATMENT PLANTS: EMISSION CHARACTERISTICS AND CONTROL STRATEGIES[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(4): 9-21. doi: 10.13205/j.hjgc.202404002

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N₂O EMISSION FROM MUNICIPAL WASTEWATER TREATMENT PLANTS: EMISSION CHARACTERISTICS AND CONTROL STRATEGIES

doi: 10.13205/j.hjgc.202404002

Shanghai Academy of Environmental Science,Shanghai 200233, China

Received Date: 2024-01-10
Available Online: 2024-06-01

Abstract

Abstract

Municipal wastewater treatment plants (MWWTPs) are regarded as one of the important nitrous oxide (N₂O) emission sources. In this paper, emission characteristics of N₂O from different areas and various treatment processes were summarized. Meanwhile, N₂O mitigation strategies concerning the optimization of operation parameters as well as the development and application of novel technologies were proposed. According to previous studies, N₂O emission from MWWTPs in East China was higher than that in West China. Moreover, N₂O emission through wastewater treatment processes was higher than that from sludge treatment systems. In the context of achieving the "carbon peaking and carbon neutrality" goals of China, N₂O mitigation should not be realized at the expense of producing by-products like NO and increasing energy consumption. Engineering measures, such as sealing the reaction tanks and installing accurate aeration systems, could reduce N₂O emissions from MWWTPs without a substantial increase in electricity expense. Promoting industrialization of novel technologies (including but not limited to aerobic granular sludge, anaerobic ammonium oxidation, and coupled aerobic-anoxic nitrous decomposition operation), along with building N₂O reduction facilities for tailwater and sidestream treatment could promote the realization of net zero carbon emission MWWTPs. In general, operation parameters optimization and novel technology development are profitable for N₂O mitigation, which is of far-reaching significance for actualizing the low-carbon operation of MWWTPs.
- municipal wastewater treatment plant,
- reduction of pollution and carbon emission,
- N₂O,
- emission characteristics,
- operation parameter,
- novel technology

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References

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