Influence of waste sorting on lifecycle carbon emission characteristics in kitchen and other wastes treatment system:A case study of Shanghai
The implementation of waste sorting regulations has resulted in the separation of kitchen waste from mixed waste,leading to changes in waste characteristics and flow patterns,which in turn affect the environmental performance of subsequent treatment processes.This study proposed a set of carbon emission quantification methods based on life cycle assessment principles,particularly focusing on the treatment processes of kitchen waste and other waste fractions most significantly influenced by waste sorting systems.Taking Shanghai,a paradigmatic city for waste sorting practices,as an illustrative case,the research comparatively analyzed the lifecycle carbon emission characteristics at various stages within waste treatment processes before and after the implementation of waste sorting regulations.The results demonstrated a significant decrease in the overall carbon emissions of the kitchen waste and other waste treatment systems with the implementation of the waste sorting systems.The extent of emission reduction was to some extent influenced by the efficiency of separating kitchen waste from other waste as well as changes in the composition of waste materials.Comparing the unit carbon emissions per ton of waste processed before and after waste sorting,it was found that the carbon emissions decreased from 300.4 kgCO2eq·t-1 prior to sorting to a range of 200.3 to 244.1 kgCO2eq·t-1 post-sorting,resulting in a maximum reduction of up to 33.3％.In terms of carbon emission sources,incineration of waste contributes the most to carbon emissions,and among these incineration-related emissions,direct carbon emissions during combustion accounted for the largest proportion.In comparison,the smaller emission intensity from kitchen waste treatment was notably influenced by how the anaerobic digestion residue derived from this process is managed.Overall,the effective separation and low-carbon treatment of kitchen waste were key to reducing carbon emissions in the kitchen and other waste management system.Analyzing the potential for emission reduction in kitchen and other waste treatment processes,it was found that combining other waste incineration for heat and power with using kitchen waste residues as soil amendments can lead to further carbon emissions reductions.
国家科技期刊平台
NSTL
万方数据
