垃圾填埋场有机污染物运移流固耦合模型及数值模拟

基于流固耦合和溶质运移理论,建立了垃圾渗滤液有机污染物运移耦合模型;考虑垃圾生物降解效应,通过试验确定了垃圾生物降解衰减曲线;用Galerkin有限元离散法对所建的模型进行数值求解,利用该数值模型对垃圾渗滤液在地下水中迁移行为进行模拟,预测了污染物浓度的时空分布特征;对耦合、非耦合模拟结果结合实际监测数据进行对比,并对污染晕的大小、分布范围进行了数值模拟分析。

Fluid-solid Coupling Model of Contaminant Transport in Landfill and Simulation

Based on the fluid-solid coupling and solution transport theory,the transport coupling model of organic contaminant in landfill leachate was established.The decay curve of landfill biodegradation was founded through experiment because the biodegradation was taken into consideration.The established model was numerically solved with Galerkin method,which simulated the transport behaviors of landfill leachate in groundwater.The temporal and spatial distribution feature of contaminant concentration was predicted.The results of coupling and uncoupling model were compared with measured data respectively.And the contaminant plume areas and distribution range were numerically simulated.The results showed that the changing trend of contaminant concentration simulated by the coupling model agreed with measured data.Thus it was verified that the coupling model was reliable and practical.