生活垃圾填埋气中甲烷短期产生时空变化规律探究

Study on Spatiotemporal Variation Rules of Methane from Landfill Gas

采用自制垃圾填埋甲烷测量装置对衡阳某垃圾处理站临时堆放的处于发酵期的垃圾开展浓度测定试验,探究垃圾填埋气中甲烷在短期内产生的时空规律。结果表明:填埋场中甲烷浓度存在明显的气体分层现象,其浓度主要与纵向填埋深度呈正相关,与距填埋场边界的水平距离呈负相关;填埋初期,距离地表越近,同一水平方向甲烷浓度在不同区域变化较大,随着填埋时间的增长其浓度变化趋于稳定;填埋场内部温度与垃圾埋深和外界温度成线性相关,并且与垃圾埋深成反比,与外界温度成正比。

The spatiotemporal variation rules of methane from landfill gas was studied by using a self-made equipment in measuring the concentration of fermentative methane generated from a temporary garbage dump in Hengyang.The results showed the concentration of methane took on obvious gas stratification,and was positively correlated with the vertical depth of the landfill but negatively correlated with the horizontal distance from the boundary of the landfill.At the initial stage of landfilling,in the same horizontal direction,the closer to the ground,the concentration of methane varied greatly in different regions.The concentration tended to be stable as time went on.The internal temperature of the landfill had a linear correlation with the depth of the landfill and the outside temperature,which was proportional to the outside temperature and inversely proportional to the depth of the landfill.