SPATIAL-TEMPORAL CHARACTERISTICS OF CARBON EMISSIONS IN URBAN SEWAGE SYSTEM IN XI'AN AND ITS DOMINANT DRIVING FACTORS
At present,the research on carbon emissions of municipal sewage systems in China is still lacking,in which accurately grasping the characteristics and influencing factors of carbon emissions is the premise of formulating emission reduction policies according to local conditions.Based on the emission factor method,the carbon emissions of each unit of the urban sewage system in Xi'an were calculated and the emission structure and temporal and spatial distribution were analyzed,the influencing factors were analyzed by using SPSS software in combination with the construction and activity level of municipal facilities.The results showed that:1)chemicals consumption and electricity consumption are the main sources of carbon emissions from sewage treatment,while CH4 and N2O emitting directly from sludge disposal units account for a relatively large proportion.2)the per capita carbon emissions of the central districts in the biological treatment and sludge disposal processes gradually decreased from 2018,while the per capita emissions of the surrounding districts increased slightly,except for Huyi and Chang'an District;in 2020,the per capita emissions of Huyi and Chang'an increased significantly,while the per capita emissions of other districts increased slightly.3)Xi'an's carbon emissions were positively correlated with the proportion of water treated by A2/O(P＜0.01),and also significantly positively correlated with population size,electricity consumption,and sludge landfill disposal amount(P＜0.01),but slightly lower correlated with the sewage concentrated treatment rate(P＜0.05).The reduction of per capita discharge in the central area should focus on the upgrading of existing sewage plants,while the construction of sewage treatment facilities in surrounding districts should fully consider the population factors,the construction of sewage treatment facilities in Chang'an District should be improved as soon as possible;it can reduce carbon emissions in the sludge disposal process in the central districts from two perspectives:source reduction and development of new sludge disposal technology;the surrounding districts should reduce the amount of landfill.
Xi'anmunicipal sewage systemtemporal and spatial characteristicsdominant unitinfluencing factor
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