考虑垃圾体沉降的生物反应器填埋场 渗滤液回灌运移规律

生物反应器填埋场在渗滤液的回灌过程中，垃圾体会产生较大的沉降变形，这主要是由于填埋体的自重和生物降解所致。由于沉降变形会导致生物反应器填埋场中垃圾体的孔隙比减小，孔隙比的减小会影响垃圾体的渗透系数和填埋场所能容纳的渗滤液量。为了研究考虑垃圾体沉降的生物反应器填埋场渗滤液回灌运移规律，根据质量守恒原理，以修正的Darcy定理为基础，结合Elagroudy等人提出的沉降模型，建立了考虑垃圾体沉降的生物反应器填埋场渗滤液回灌的计算模型，应用该模型研究了非饱和条件下渗滤液在生物反应器填埋场中的运移规律，分析了回灌强度、垃圾体初始孔隙比、初始含水率和组成成份等参数变化对垃圾体含水率和填埋场单位表面积回灌量的影响规律。

Leachate recirculation in bioreactor landfills considering settlement of municipal solid waste

During leachate recirculation, a bioreactor landfill will experience more rapid and complete settlement, which is mostly attributed to the weight of municipal solid waste (MSW) and its biodegradation. The settlement of the landfill will cause the decrease of void ratio of the MSW, which will influence the permeability of the MSW and the leachate quantity that can be held in the bioreactor landfill. To study leachate recirculation in bioreactor landfills, based on the law of conservation of mass, the modified Darcy’s law and the Elagroudy’s settlement model, a new model is developed. Using this model, the transport law of injected leachate in bioreactor landfills is determined under unsaturated condition. The effects of various parameters (i.e. injection intensity, initial void ratio, water content and composition of MSW, etc.) on the water content of the MSW and unit surface area recirculation quantity are analyzed.