N2O EMISSION FROM MUNICIPAL WASTEWATER TREATMENT PLANTS:EMISSION CHARACTERISTICS AND CONTROL STRATEGIES
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 plantreduction of pollution and carbon emissionN2Oemission characteristicsoperation parameternovel technology
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