固体危险废物填埋场地下水环境影响数值模拟与评价

Numerical simulation and evaluation of groundwater environmental impact of solid hazardous waste landfill site

本文以东营某固体危险废物处置中心项目为例,分析了非正常工况持续泄露条件下固体危险废物填埋场渗滤液中Cd在地下水中的迁移规律。一旦发生事故,渗滤液将会通过第包气带渗入至地下水中,从而造成地下水污染,使地下水水质恶化。经预测事故状态下,对孔隙水影响有一定影响,影响范围较小。从水平方向看对于第一及第二模拟层,持续泄漏发生后,地下水污染中心浓度均逐步升高,污染面积逐步扩大。从垂直方向看第一及第二模拟层受污染物影响较大,第三模拟层未受到污染物影响,可见随着深度的增加,受污染物影响逐渐减小。

Taking the project of a solid hazardous waste disposal center in Dongying as an example,this paper analyzes the migration law of Cd which is from the l eachate of solid hazardous waste landfill under the condition of continuous leakage of abnormal working conditions in groundwater.In the event of an accident,leachate would be infiltrated into the groundwater through the vadose zone,causing groundwater pollution and worsening the groundwater quality.Under the condition of the acc ident,the pore water would be influenced and the influence area would be comparatively small.From the horizontal point of view,for the first and second simulation lay ers,the concentration of groundwater pollution center would be gradually increased and the pollution area would be gradually expanded after the continuous leakage.Fro m the vertical point of view,the first and second simulation layers would be affected by the pollutant,and the third simulation layer would be not affected.It can clearly b e seen that along with the increase of the depth,the influence of the pollutants decreases gradually in groundwater.