淮安市化工企业地下水污染预测与风险评价

目的]评价地下水污染风险,为同类建设项目及企业自环评的地下水污染预测与风险评价提供一种简单有效的新方法。方法]建立基于过程模拟的溶质运移数学模型,对特征污染物高锰酸盐指数和镍的污染水平和污染范围进行预测,提出以保护地下水为目标的风险评价方法,以某化工厂为案例进行地下水污染风险评价。结果]突发事故后100d,高锰酸盐指数最大迁移距离11.6m,镍最大迁移距离10.8m,分别超出厂界范围8.8和8.0 m;监测井2属较高污染风险等级,监测井3属中等污染风险等级。结论]特征污染物在地下水中的扩散速度快,对水质影响严重,因而运行期须对污染源加强跟踪监测、定期检查污水池防渗性能。

Forecast and Risk Assessment of Groundwater Pollution in a Chemical Plant in Huai'an City, Jiangsu Province

Objective] The risk of groundwater pollution was evaluated, in order to provide a simple and effective new method for groundwater pollution forecast and risk assessment of both similar construction projects and enterprises'' independent environmental impact assessment.Methods] A solute transport model based on the mathematical model of solute transport was established to predict the pollution levels of COD_Mn and Ni. And a risk assessment method for groundwater protection was developed to evaluate the groundwater contamination risk.Results] After 100 d of a sudden accident, the maximum migration distance of COD_Mn was 11.6 m, for Ni, it was 10.8 m, having 8.8 m and 8.0 m spreads beyond the boundary of this factory, respectively. The monitor well W₂ was determined as higher pollution risk level, and W₃ as middle pollution risk level.Conclusion] Pollutants such as COD_Mn and Ni in the groundwater diffuse rapidly, affect water quality seriously, so that track monitoring should be strengthened and the impermeability should be checked regularly.