Chiemchaisri C, Chiemchaisri W, Kumar Sunil, Hettiaratchi J P A
Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, 50 Phaholyothin Road, Chatuchak, Bangkok, 10900, Thailand.
Environ Monit Assess. 2007 Dec;135(1-3):41-8. doi: 10.1007/s10661-007-9706-2. Epub 2007 Apr 26.
Solid waste characteristics and landfill gas emission rate in tropical landfill was investigated in this study. The experiment was conducted at a pilot landfill cell in Thailand where fresh and two-year-old wastes in the cell were characterized at various depths of 1.5, 3, 4.5 and 6 m. Incoming solid wastes to the landfill were mainly composed of plastic and foam (24.05%). Other major components were food wastes (16.8%) and paper (13.3%). The determination of material components in disposed wastes has shown that the major identifiable components in the wastes were plastic and foam which are resistant to biodegradation. The density of solid waste increased along the depth of the landfill from 240 kg m(-3) at the top to 1,260 kg m(-3) at the bottom. Reduction of volatile solids content in waste samples along the depth of landfill suggests that biodegradation of solid waste has taken place to a greater extent at the bottom of the landfill. Gas production rates obtained from anaerobic batch experiment were in agreement with field measurements showing that the rates increased along the depth of the landfill cell. They were found in range between 0.05 and 0.89 l kg(-1) volatile solids day(-1). Average emission rate of methane through the final cover soil layer was estimated as 23.95 g(-2)day(-1) and 1.17 g(-2)day(-1) during the dry and rainy seasons, respectively.
本研究调查了热带地区垃圾填埋场的固体废物特性及填埋气排放速率。实验在泰国一个试验性填埋单元进行，对该单元中新鲜垃圾和两年期垃圾在1.5米、3米、4.5米和6米等不同深度进行了特性分析。进入填埋场的固体废物主要由塑料和泡沫组成（24.05%）。其他主要成分是食物垃圾（16.8%）和纸张（13.3%）。对处置废物中物质成分的测定表明，废物中主要可识别成分是抗生物降解的塑料和泡沫。固体废物的密度沿填埋深度增加，从顶部的240千克/立方米增加到底部的1260千克/立方米。沿填埋深度方向，废物样品中挥发性固体含量的降低表明，固体废物的生物降解在填埋场底部发生的程度更大。厌氧批次实验得到的产气速率与现场测量结果一致，表明产气速率沿填埋单元深度增加。产气速率在0.05至0.89升/千克挥发性固体·天之间。通过最终覆盖土层的甲烷平均排放速率在旱季和雨季分别估计为23.95克/平方米·天和1.17克/平方米·天。
