分层填埋垃圾体中气体一维稳态运移规律

One-dimensional gas migration in multi-layered landfills of municipal solid wastes

摘要: 针对垃圾填埋场分层填埋特点,提出了填埋垃圾产气率和导气系数分层计算方法,建立了分层填埋垃圾体中气体一维稳态运移分析模型,分析了垃圾的产气率、导气系数和封顶覆盖层的气密性对气压力大小及分布的影响,并探讨了垃圾填埋龄期对气压力分布的影响规律。分析结果表明:对于均质垃圾体,产气率与导气系数的比值越大,则填埋气压力越大;对于含封顶覆盖层的垃圾体,产气率主要控制气压力大小,导气系数控制气压力沿填埋深度分布梯度。封顶覆盖层厚度的增加或其导气系数的降低将使填埋气释放量减少,则气压力整体提高。垃圾填埋龄期越大,则垃圾体中气压力越小。

Abstract: A calculation method is presented for determining the change of gas generation rate and gas permeability with depth in a MSW landfill.One-dimensional model of gas migration in multi-layered landfills is established on the basis of the flow theory in porous media.The influences of gas generation rate,gas permeability of MSW and cap cover on gas pressure distribution are investigated.The influences of fill age of MSW on gas pressure distribution are also analyzed.The analytic results show that the gas pressur...