Research on Gas Yield in Municipal Solid Waste Landfill

摘要

Landfill gas (LFG), mainly composed of methane and carbon dioxide, is the products of physical, chemical and biological reactions in municipal solid waste (MSW) landfill. The concepts of theoretical gas yield, potential gas yield, practical gas yield and practical gas recovery are introduced, and the estimation model of LFG yield are established. The corresponding parameters needed by the model are determined by experiments and experiences on the basis of the average component features and landfilling behavior of MSW in China. According to the model, potential methane yield and practical methane yield per ton MSW in China are 29.3m~3 and 17.6 m~3 respectively, and the potential methane yield of landfilled MSW in China is approximately 34.8 X 10~9 m~3 in 2000, accounting for 3.6～12.5% of that in the world. The control and recovery of LFG is of great significance in environmental benefits as well as in economic benefits.