不同垃圾场地类型地下水污染风险评价

Pollution Risk Assessment of Groundwater Below Different Types of Garbage Site

通过对垃圾场地本身存在的内在风险、垃圾场地所处位置的地下水防污性能、垃圾场地与水源保护区间的关系分析,对垃圾场地地下水污染风险进行评价。垃圾场地内在风险采用灰色聚类法进行评价,垃圾场地地下水固有防污性能采用DRASTIC模型进行评价。对北京两不同垃圾场地类型地下水污染风险评价结果表明,位于冲洪积扇上部,以沙砾石为主的粗颗粒地层,地下水防污性能较差,地下水的污染风险高,不适宜做垃圾场地;位于冲洪积扇下部,以黏性土层为主的细颗粒地层,地下水防污性能相对较好,位于水源保护区外的地区,污染风险相对较低,较适合做垃圾场地。

This paper evaluated the pollution risk of groundwater below garbage site,by analyzing the inner risk of garbage site,antifouling performance of groundwater below garbage site and relationship between garbage site and water resource protection zones.The paper used gray cluster analysis method to evaluate the inner risk of garbage site,and DRASTIC model to evaluate the antifouling performance of groundwater below garbage site.The results of the analysis show that the place,located at the upper part of alluvial-proluvial fan with sand gravel based coarse particle formation,is not suitable to be used as garbage site for the poorer antifouling performance and higher pollution risk of groundwater;and that the place,located at the lower part of alluvial-proluvial fan with viscous soil based fine particle formation,is much more suitable to be used as garbage site because it locates beyond water resource protection zones,and the groundwater has better antifouling performance and lower pollution risk.