摘要
Abstract
[Objective]The wastewater treatment industry is one of the main sources of greenhouse gas(GHG)emissions in the global industrial sector.To accelerate the realization of carbon neutrality goals in China,reducing GHG emissions from wastewater treatment plants(WWTPs)is essential.However,it still lacks a systematic,standardized,and high-precision GHG emission inventory for these WWTPs in China.[Methods]In order to accelerate the establishment of a systematic GHG emission standard for the wastewater industry,this study took a urban WWTP in a city in Sichuan Province as the research object,and used the emission factor method combined with the gray correlation to calculate the GHG emission inventory generated by the WWTP in the biochemical treatment stage,energy consumption stage,agent consumption stage,sludge disposal stage,and tailwater discharge stage from 2021 to 2023.The main factors affecting the GHG emissions of WWTPs were analyzed,and corresponding emission reduction measures were proposed to construct a standardized GHG emission inventory.[Results]The result showed that carbon emissions from the reagent consumption stage and the biochemical treatment stage account for about 80％of the overall emissions and were the main source of carbon emissions from WWTPs,and carbon emissions caused by tailwater discharge were the main influencing factors of GHG emissions from WWTPs,accounting for 9.13％of the overall emissions.The reason might be that in order to met the high standard of effluent pollutant concentration limits,the amount of chemical agents added was increased to reduce the pollutant concentration in wastewater,thereby causing GHG emissions.Optimizing processes,updating equipment,and introducing precision dosing systems could effectively reduce GHG emissions from WWTPs.[Conclusion]Based on this study,a transparent,verifiable,and comparable GHG emission inventory for WWTPs can be established,providing guidelines for the formulation of carbon neutrality and green wastewater management policies and technologies in China's wastewater industry,thereby promoting GHG emission reduction in China's wastewater industry and accelerating the achievement of carbon neutrality goals.关键词
城镇污水处理厂/碳排放/Kaya恒等式/灰色关联度/减排路径Key words
urban wastewater treatment plant(WWTP)/carbon emission/Kaya identity/grey correlation/emission reduction path分类
建筑与水利
