Liu Yue-Ting, Zhang Qiang, Yuan Xiao-Hong, Xie Wen-Hao
College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China.
Huan Jing Ke Xue. 2025 Jan 8;46(1):88-99. doi: 10.13227/j.hjkx.202401063.
The construction of "zero-free cities" is an effective plan to achieve the carbon peak plan, reduce pollution and carbon emissions, and promote a circular economy. Based on the WARM model and Emission factor method, the total carbon emission reduction of solid waste sources and disposal in each field during the implementation of the zero-free city policy in Chongqing （2017-2021） was calculated, and the total carbon emission reduction of solid waste in each field in 2025 was predicted by scenario. The results showed that： ① After the implementation of cleaner production and green manufacturing policies in Chongqing, the generation intensity of general industrial solid waste decreased to 0.20 t·（10 yuan） in 2021, and the carbon emission reduction in the industrial sector had been increasing since 2020. Due to the growth of the economy and living level, the per capita production of food waste, domestic waste, and e-waste increased, failing to reduce emissions at the source in these areas. In addition, the promotion of green food and organic agricultural products and the restriction of the use of chemical fertilizers and pesticides could be strengthened to further reduce source emissions in the agricultural field. ② General industrial solid waste, construction waste, and straw were the key areas to achieve carbon emission reduction, and their carbon emission reductions were predicted to increase to 2 796.64×10, 538.54×10, and 99.07×10 t in 2021. Respectively, reducing the landfill volume in the above fields is the key to emission reduction. In the field of daily life, the collection and transportation of solid waste should be improved, the sorting process and disposal facilities should be refined, and the resource recycling rate should be improved to reduce its carbon emissions. Due to the improvement of the collection level and the application of straw feed and fertilizer, the carbon emission reduction of straw and agricultural film is generally rising, and the proportion of straw and livestock manure directly returned to the field should be reduced in the agricultural field, and the allocation of biomass disposal facilities to promote the co-disposal of the two may be the best means of carbon emission reduction. ③ In 2025, the predicted carbon emission reductions in Chongqing under the BAU scenario and the PLAN scenario were 2 289.78×10 and 2 750.31×10 t, respectively, indicating that the upgrading and transformation of local industries and the large-scale scale of the renewable resources industry have achieved good carbon reduction benefits. With the construction and improvement of various waste disposal facilities in 2025, the carbon emission reduction of the solid waste disposal process in various fields will continue to increase, but the carbon emissions of hazardous waste, municipal sludge, and livestock and poultry manure will still be in a state of growth due to the possible increase in total output in the future.
“无废城市”建设是实现碳达峰、减少污染和碳排放、促进循环经济的一项有效举措。基于WARM模型和排放因子法，计算了重庆“无废城市”政策实施期间（2017—2021年）各领域固体废物源头及处置的碳排放总量减排量，并通过情景分析预测了2025年各领域固体废物的碳排放总量减排量。结果表明：①重庆实施清洁生产和绿色制造政策后，2021年一般工业固体废物产生强度降至0.20吨/（10万元），工业部门的碳减排量自2020年以来持续增加。由于经济和生活水平的提高，餐厨垃圾、生活垃圾和电子废弃物的人均产生量增加，这些领域未能从源头实现减排。此外，可加强绿色食品和有机农产品的推广，限制化肥和农药的使用，以进一步减少农业领域的源头排放。②一般工业固体废物、建筑垃圾和秸秆是实现碳减排的重点领域，预计其2021年的碳减排量分别增至2796.64×10、538.54×10和99.07×10吨。减少上述领域的填埋量是减排的关键。在日常生活领域，应改进固体废物的收集运输，优化分类流程和处置设施，提高资源回收率以减少其碳排放。由于收集水平的提高以及秸秆饲料化和肥料化的应用，秸秆和农膜的碳减排量总体呈上升趋势，农业领域应减少秸秆和畜禽粪便直接还田的比例，配置生物质处置设施以促进两者的协同处置可能是最佳的碳减排手段。③2025年，重庆在基准情景（BAU）和规划情景（PLAN）下预测碳减排量分别为2289.78×10吨和2750.31×10吨，表明当地产业升级转型和可再生资源产业规模化发展取得了良好的碳减排效益。随着2025年各类废物处置设施的建设和完善，各领域固体废物处置过程的碳减排量将持续增加，但危险废物、市政污泥和畜禽粪便的碳排放量仍将因未来产量可能增加而处于增长状态。
