CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur 440 020, India.
CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur 440 020, India.
Waste Manag. 2020 Oct;116:120-130. doi: 10.1016/j.wasman.2020.07.033. Epub 2020 Aug 11.
Municipal Solid Waste (MSW) landfills are sources of physical, chemical and microbiological processes and as a result, gases and heat are generated as by-products. The generated heat flows from the higher to lower temperature regions within the landfill. Specific heat and thermal conductivities are two important properties that determine heat flow in MSW landfills. The goal of this study was to determine the thermal conductivity and specific heat capacity of MSW samples of Indian origin and to study its effect on landfill fires. Thermal conductivity and specific heat capacity of waste samples collected from dumpsite at Bhandewadi landfill, Nagpur & Bellahalli landfill, Bangalore (India) and the synthetic MSW (prepared in the lab) were determined using newly designed and fabricated experimental set-up. Results showed that moisture and organic content of MSW are directly proportional to specific heat capacity and indirectly proportional to thermal conductivity. Thermal conductivity of MSW is directly proportional to its density and specific heat is indirectly proportional to the density of MSW. MSW with specific heat and thermal conductivity in the range 0.003 J/g. K - 0.47 J/g. K and 0.35-3.6 J/s. m. K, respectively were found between 30 and 75 °C with 5% to 25% moisture content. As the temperature increases above 75 °C, decrease in thermal conductivity & increase in specific heat was observed and thermal conductivity of 0.07 J/s. m. K was observed at 130-140 °C. As a result of this, heat does not flow and gets concentrated in that region leading to landfill fire.
城市固体废物 (MSW) 垃圾填埋场是物理、化学和微生物过程的源头，因此会产生气体和热量等副产品。产生的热量会从垃圾填埋场内温度较高的区域流向温度较低的区域。比热和热导率是决定 MSW 垃圾填埋场热量流动的两个重要特性。本研究的目的是确定源自印度的 MSW 样品的热导率和比热，并研究其对垃圾填埋场火灾的影响。使用新设计和制造的实验装置，测定了来自 Nagpur 的 Bhandewadi 垃圾填埋场和 Bangalore 的 Bellahalli 垃圾填埋场垃圾场以及实验室制备的合成 MSW 废物样品的热导率和比热。结果表明，MSW 的水分和有机含量与比热成正比，与热导率成反比。MSW 的热导率与其密度成正比，比热与 MSW 的密度成反比。在 30 到 75°C 之间，水分含量为 5%至 25%之间，发现 MSW 的比热和热导率范围分别在 0.003 J/g.K 到 0.47 J/g.K 和 0.35 到 3.6 J/s.m.K。当温度高于 75°C 时，观察到热导率下降和比热增加，在 130-140°C 时观察到热导率为 0.07 J/s.m.K。因此，热量不会流动，而是集中在该区域，导致垃圾填埋场火灾。
