Methane and nitrous oxide emissions from municipal wastewater treatment plants in China:A plant-level and technology-specific study  

作　　者：Haiyan Li Liangfang You He Du Bowen Yu Lu Lu Bo Zheng Qiang Zhang Kebin He Nanqi Ren 

机构地区：[1]School of Civil and Environmental Engineering,Harbin Institute of Technology,Shenzhen,518055,China [2]Shenzhen Key Laboratory of Ecological Remediation and Carbon Sequestration,Institute of Environment and Ecology,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen,518055,China [3]Ministry of Education Key Laboratory for Earth System Modeling,Department of Earth System Science,Tsinghua University,Beijing,100084,China [4]State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing,100084,China

出　　处：《Environmental Science and Ecotechnology》2024年第4期123-130,共8页环境科学与生态技术（英文）

基　　金：supported by the Shenzhen Science and Technology Innovation Commission(No.RCBS20210609103731062,No.WDZC20220810110301001);Guangdong Basic and Applied Basic Research Foundation(No.2021A1515110887);H.L.acknowledge additional support from the Shenzhen Overseas High-Level Talent Project.

摘　　要：Wastewater treatment is an important source of greenhouse gases(GHGs).Yet large uncertainties remain in the quantification of GHG emissions from municipal wastewater treatment plants(MWWTPs)in China.A high-resolution and technology-specific emission inventory is still lacking to support mitigation strategies of MWWTPs.Here we develop a plant-level and technology-based MWWTP emission inventory for China covering 8703 plants and 19 treatment technology categories by compiling and harmonizing the most up-to-date facility-level databases.China's methane(CH_(4))and nitrous oxide(N_(2)O)emissions from MWWTPs in 2020 are estimated to be 150.6 Gg and 22.0 Gg,respectively,with the uncertainty range of-30%to 37%and-30%to 26%at 95%confidence interval.We find an emission inequality across cities,with the richest cities emitting two times more CH_(4)and N_(2)O per capita from municipal wastewater treatment than the poorest cities.The emitted CH_(4)and N_(2)O are dominated by Anaerobic/Anoxic/Oxic-,Sequencing Batch Reactor-,Oxidation Ditch-,and Anoxic/Oxic-based MWWTPs of less than 20 years old.Considering the relatively young age structure of China's MWWTPs,the committed emissions highlight the importance of reducing on-site GHG emissions by optimization of operating conditions and innovation management.The emission differences among our estimates,previous studies,and the Intergovernmental Panel on Climate Change guidelines are largely attributed to the uncertainties in emission factors,implying the urgent need for more plant-integrated measurements to improve the accuracy of emission accounting.

关 键 词：METHANE Nitrous oxide EMISSIONS Municipal wastewater treatment plants 

分 类 号：X703[环境科学与工程—环境工程]