不同地质条件下填埋场渗滤液污染的数值模拟

填埋场渗滤液中的有害物质特别是重金属离子一旦渗漏,将对环境造成严重危害。渗滤液在地下水中污染物的迁移转化是综合物理、化学及生物作用的过程。通过数值模型对地下水及渗滤液的迁移模式进行了讨论,分析了吸附函数、渗透系数和水力梯度对污染物的运移具有显著的影响,对各因素按一定的数量级别分别取值,安排数值试验,得出各因素的污染临界值。吸附函数对污染物的运移影响最大,当填埋场地基含有强透水层时,污染范围会显著增大。当水力梯度增加时,应加强对污染物的监测。

Numerical Simulation on Pollution of Landfill Percolate in Varied Geological Conditions

Landfill percolate,especially the heavy metal ion,will do harm to the surrounding environment once percolating.Migration and transformation of percolate in groundwater pollutant are the process mixed with physical,chemical and biological reactions.Through numerical simulation,migration mode of groundwater and percolate is discussed,and it analyzes that the adsorption function,permeability coefficient and hydraulic gradient have influence on the transport of groundwater pollutant.The values are obtained according to quantity grade for every factor,numerical tests are arranged,then the pollution critical concentrations of each factor are obtained.Adsorption function influence on the transport of pollutant is the most important factor of them.The area of pollution is enlarged as the existence of strong permeable stratum.With the hydraulic gradient rising,monitoring of pollutant is necessary to be strengthened.