MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China.
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China.
Waste Manag. 2024 Dec 1;189:290-299. doi: 10.1016/j.wasman.2024.08.029. Epub 2024 Sep 1.
This study proposes a comprehensive evaluation method based on a two-stage model to assess greenhouse gas (GHG) emissions and reductions in high-food-waste-content (HFWC) municipal solid waste (MSW) landfills. The proposed method considers typical processes such as fugitive landfill gas (LFG), LFG collection, flaring, power generation, and leachate treatment. A case study of an HFWC MSW landfill in eastern China is considered to illustrate the evaluation. The findings revealed that the GHG emissions equivalent of the case landfill amounted to 21.23 million tons from 2007 to 2022, averaging 1.03 tons CO-eq per ton of MSW. There was a potential underestimation of LFG generation at the landfill site during the initial stages, which led to delayed LFG collection and substantial fugitive LFG emissions. Additionally, the time distribution of GHG emissions from HFWC MSW was significantly different from that of low-food-waste-content (LFWC) MSW landfills, with peak emissions occurring much earlier. Owing to the rapid degradation characteristics of HFWC MSW, the cumulative LFG production of the landfill by 2022 (2 years after the final cover) was projected to reach 77 % of the total LFG potential. In contrast, it would take until 2030 for LFWC MSW landfills to reach this level. Furthermore, various scenarios were analyzed, in which if the rapid LFG generation characteristics of HFWC MSW are known in advance, and relevant facilities are constructed ahead of time, the collection efficiency can be improved from 31 % to over 78 %, resulting in less GHG emissions.
本研究提出了一种基于两阶段模型的综合评价方法，用于评估高食物垃圾含量（HFWC）城市固体废物（MSW）填埋场的温室气体（GHG）排放和减排。所提出的方法考虑了典型的过程，如逸散的垃圾填埋气（LFG）、LFG 收集、燃烧、发电和渗滤液处理。考虑了中国东部一个 HFWC MSW 填埋场的案例研究来进行评估。研究结果表明，案例填埋场 2007 年至 2022 年的 GHG 排放当量达到 2123 万吨，平均每吨 MSW 产生 1.03 吨 CO-eq。在填埋场的初始阶段，LFG 的产生可能被低估，导致 LFG 收集延迟和大量逸散 LFG 排放。此外，HFWC MSW 的 GHG 排放时间分布与低食物垃圾含量（LFWC）MSW 填埋场明显不同，峰值排放发生得更早。由于 HFWC MSW 的快速降解特性，到 2022 年（最后覆盖层后 2 年），填埋场的累积 LFG 产量预计将达到总 LFG 潜力的 77%。相比之下，LFWC MSW 填埋场要到 2030 年才能达到这一水平。此外，还分析了各种情景，如果提前了解 HFWC MSW 的快速 LFG 产生特性，并提前建造相关设施，可以将收集效率从 31%提高到 78%以上，从而减少 GHG 排放。
