[Analysis of the Impact of Waste Classification on Carbon Emission Reduction of Waste Treatment in Urban-Rural Integration Mode： A Case Study of Baoji City]

Domestic waste treatment is an important source of anthropogenic greenhouse gas emissions, and it is of great significance to clarify the carbon emission intensity of each link before and after waste classification treatment to help with the "double carbon" goal. Based on the relevant data on domestic waste generation in Baoji City in 2021, combined with the integrated urban and rural domestic waste disposal model, the carbon emission intensity of urban and rural domestic waste treatment before and after classification was calculated using the IPCC inventory guide carbon emission factor method. The results showed that by reducing the proportion of simple landfills in rural areas, the carbon reduction could reach 59 451.62 t （measured by CO₂-eq）, and the total carbon reduction after waste classification and treatment in Baoji City in 2021 could reach 251 617.37 t （measured by CO₂-eq）. CH₄ accounted for 96.75% of carbon emissions before waste classification, and CO₂ accounted for 83.74% after waste classification. After waste classification and treatment, the consumption of combustifiers could produce 1 167.16 t （measured by CO₂-eq） of carbon emissions per year, accounting for 0.38% of direct carbon emissions. Pharmaceutical consumption from leachate and incineration flue gas treatment produced 2 126.91 t （measured by CO₂-eq） of carbon emissions per year, accounting for 9.95% of indirect carbon emissions. Further improving the classification system of solid waste, changing the treatment method, improving the collection and utilization rate of landfill gas, and strengthening the CH₄ oxidation capacity of the covering layer are feasible carbon emission reduction measures.