Civil Engg. Dept, M. S. Ramaiah University of Applied Sciences, Bengaluru 560 058, India.
CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, India.
Sci Total Environ. 2020 Mar 10;707:135610. doi: 10.1016/j.scitotenv.2019.135610. Epub 2019 Nov 20.
The heat generation and temperature rise due to the anaerobic degradation of municipal solid waste (MSW) for selected landfills across India have been estimated in this paper. MSW was quantitatively characterized into carbohydrates, proteins, fats using landfill degradation and transport (LDAT) model equations' and the physical composition of MSW. The heat released due to the breakdown of per kg of carbohydrates, proteins, fats were calculated using chemical equations involved in the anaerobic degradation process. The heat released per tonne of MSW degradation and temperature rise for selected cases was calculated. Moisture content and carbohydrates percentage were crucial parameters in estimating the heat generation as Mavallipura landfilled MSW having 43% carbohydrates and moisture content of 17% released maximum heat of 1116.81 × 10 kJ/t of MSW and Pirana landfill MSW having 12.98% carbohydrates and moisture content of 29.03% released minimum heat of 391.82 × 10 kJ/t of MSW. This generated heat may cause several issues, such as landfill fires, temperature rise in the surrounding areas of landfill, air pollution leading to global warming and other environmental issues. The heat generated from the biodegradation process is a renewable energy resource that can be systematically extracted from the waste mass and used for direct heating purpose in nearby facilities or for augmenting industrial processes having suitable technologies like combined heat and power gas engines, geothermal heat extraction system, etc. This study concludes that the total quantity of heat released depends on the quantity of carbohydrates present in waste and not on total organic content.
本文估算了印度部分垃圾填埋场中，由于城市固体废物（MSW）的厌氧降解而产生的热量和温度升高。使用填埋场降解和运输（LDAT）模型方程和 MSW 的物理组成，对 MSW 中的碳水化合物、蛋白质和脂肪进行了定量分析。利用厌氧降解过程中涉及的化学方程式，计算了每公斤碳水化合物、蛋白质和脂肪分解所释放的热量。计算了选定案例中每吨 MSW 降解和温度升高所释放的热量。水分含量和碳水化合物百分比是估计热量产生的关键参数，因为 Mavallipura 填埋的 MSW 含有 43%的碳水化合物和 17%的水分含量，释放出最大的热量为 1116.81×10 kJ/t 的 MSW；而 Pirana 填埋场的 MSW 含有 12.98%的碳水化合物和 29.03%的水分含量，释放出最小的热量为 391.82×10 kJ/t 的 MSW。这种产生的热量可能会导致一些问题，例如垃圾填埋场火灾、垃圾填埋场周围地区的温度升高、空气污染导致全球变暖以及其他环境问题。生物降解过程中产生的热量是一种可再生能源，可以从废物中系统地提取出来，用于附近设施的直接加热目的，或用于增强具有合适技术的工业过程，如联合热电燃气发动机、地热热提取系统等。本研究得出的结论是，释放的总热量取决于废物中存在的碳水化合物的数量，而不是总有机含量。
