Chen Ji-Hong, Bian Rong-Xing, Zhang Ting-Xue, Gao Chen-Qi, Sun Ying-Jie, Li Wei-Hua, Zhang Guo-Dong, Zhan Mei-Li
School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China.
Qingdao Jieyuan Environment Co., Ltd., Qingdao 266300, China.
Huan Jing Ke Xue. 2023 May 8;44(5):2995-3002. doi: 10.13227/j.hjkx.202206322.
The municipal solid waste (MSW) sector is an important source of greenhouse gas (GHG) emissions. MSW classification can achieve waste reduction and improve resource utilization. However, few studies have investigated the effects of MSW classification on GHG emission reduction. Therefore, the GHG emissions under different MSW disposal modes before and after classification were studied based on the life cycle assessment method in the four districts of Qingdao City. The results showed that MSW classification could significantly reduce the GHG emissions during the whole MSW treatment process. The net carbon emissions(in CO/MSW)during the whole process of waste treatment for mode 1 (mixed collection+landfill), mode 2 (mixed collection+incineration), mode 3 (waste classification+anaerobic digestion of food waste and other incineration), and mode 4 (waste classification+anaerobic digestion of food waste, recycling of recyclable waste, and other incineration) were 686.39, -130.12, -61.88, and -230.17 kg·t, respectively. Improving the classification efficiency of food waste had no significant impact on carbon emissions. The reduction in carbon emissions increased linearly with the improvement of waste recycling efficiency. For every 10% increase in the recovery efficiency of recyclable waste, the net carbon emission decreased by 26.6%(16.5 kg·t). Appropriate separation of food waste, improving the recycling efficiency of recyclable waste, and reducing the leakage rate of biogas from anaerobic digestion are feasible strategies to reduce carbon emissions from MSW disposal units through the classification of MSW.
城市固体废弃物（MSW）部门是温室气体（GHG）排放的一个重要来源。MSW分类能够实现废物减量并提高资源利用率。然而，很少有研究调查MSW分类对GHG减排的影响。因此，基于生命周期评估方法，对青岛市四个区不同MSW处置模式在分类前后的GHG排放进行了研究。结果表明，MSW分类能够显著降低整个MSW处理过程中的GHG排放。模式1（混合收集+填埋）、模式2（混合收集+焚烧）、模式3（垃圾分类+厨余垃圾厌氧消化及其他焚烧）和模式4（垃圾分类+厨余垃圾厌氧消化、可回收物回收利用及其他焚烧）在整个废物处理过程中的净碳排放（以CO/MSW计）分别为686.39、-130.12、-61.88和-230.17 kg·t。提高厨余垃圾的分类效率对碳排放没有显著影响。碳排放的减少随着废物回收效率的提高呈线性增加。可回收物回收效率每提高10%，净碳排放量下降26.6%（16.5 kg·t）。通过MSW分类，适当分离厨余垃圾、提高可回收物的回收效率以及降低厌氧消化过程中沼气的泄漏率是减少MSW处置单位碳排放的可行策略。
