Environmental Science and Engineering Department, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India.
Environmental Science and Engineering Department, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India.
Environ Res. 2024 Jun 15;251(Pt 2):118669. doi: 10.1016/j.envres.2024.118669. Epub 2024 Mar 17.
In India, majority of the generated municipal solid waste (MSW) was dumped in poorly managed landfills and dumpsites over the past decades and is an environmental and health hazard. Landfill mining is a promising solution to reclaim these sites along with the recovery of resources (materials and energy). During landfill mining operations, the combustible fraction is one of the major components recovered and needs proper management for maximizing resource recovery. For the identification of appropriate resource recovery options, knowledge of the physicochemical characteristics is required. The present study aims to assess the depth-wise change in the composition of legacy waste and the physicochemical characteristics of the combustible fraction. Furthermore, a material flow analysis considering the incineration of combustible fraction was performed to estimate the energy generation potential and the associated greenhouse gas (GHG) emissions. The results of the compositional analysis of dry legacy waste revealed that the fine fraction (<4 mm soil-like material) was dominating with a share of 36%. The depth-wise analysis showed a decrease in the calorific value with increasing landfill depth, while no specific trend was observed for the other parameters analyzed, including proximate and ultimate analysis, and chlorine content. The material flow analysis performed for 100 tonnes of wet legacy waste indicated that 52 tonnes of waste is combustible fraction. The GHG emissions through incineration of one tonne of dry combustible fraction would be 1389 kg CO-eq, with 1125 kWh of electrical energy generation potential.
在过去几十年中，印度大部分产生的城市固体废物（MSW）都被倾倒在管理不善的垃圾填埋场和垃圾场中，这对环境和健康构成了威胁。垃圾填埋场开采是回收这些场地并回收资源（材料和能源）的有前途的解决方案。在垃圾填埋场开采作业中，可燃部分是回收的主要成分之一，需要进行适当的管理，以最大限度地提高资源回收利用率。为了确定适当的资源回收选择，需要了解物理化学特性。本研究旨在评估旧废物的组成在深度方向上的变化以及可燃部分的物理化学特性。此外，还考虑了可燃部分的焚烧进行了物质流分析，以估算潜在的能源产生量和相关的温室气体（GHG）排放。干旧废物的组成分析结果表明，细颗粒（<4 毫米的类似土壤的物质）占主导地位，占 36%。深度分析表明，随着垃圾填埋深度的增加，热值降低，而其他分析参数（包括近似分析和最终分析以及氯含量）没有特定趋势。对 100 吨湿旧废物进行的物质流分析表明，52 吨废物是可燃部分。一吨干可燃部分焚烧产生的温室气体排放量将为 1389 公斤 CO-eq，具有 1125 千瓦时的发电潜力。
