Research on carbon accounting method of urban sewage system and analysis of typical process carbon reduction path
The existing sewage treatment carbon accounting system was sorted out in this pa-per,accounting methods and boundary ranges for different application scenarios were proposed,and 8 typical sewage treatment plants in Changsha were selected for carbon accounting analysis.It was found that the power consumption in the sewage treatment plant project and N2O in the bio-chemical unit were the main carbon emission hotpots,which contributed 53.28％and 23.56％of the carbon emissions respectively.At the same time,the fossil source CO2 emission was also an important emission source that could not be ignored in the operation process of sewage treatment plants.Through the accounting analysis of typical processes,it was found that the carbon emission intensity indexes of AAO-MBR process were at the highest level.Through the correlation analysis of carbon emission influencing factors,it was found that the influent TN and BOD5 concentrations showed a negative correlation with the carbon emission intensity.The case sewage treatment plant achieved a certain scale of carbon emission reduction within the plant boundary through a series of carbon replacement measures,but it was far from the carbon neutrality target of the sewage treat-ment industry.Based on the analysis above,the carbon emission reduction path of the whole process of source,network,plant and terminal was proposed.
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维普
