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为研究垃圾填埋场对地下水的污染风险,在分析了研究区的水文地质条件的基础上,采用解析法计算并预测了COD和NH_3-N在调节池瞬时泄漏和持续泄漏2种非正常工况下的运移情况。结果表明,该垃圾填埋场在调节池瞬时泄漏的情况下,COD和NH_3-N的影响范围1 500 m,在调节池持续泄漏的情况下,COD在136 a后的影响范围500 m,NH_3-N在54 a后的影响范围500 m,对下游地下水均有一定的影响,据此提出了在非正常工况下相应的保护措施,可有效降低垃圾填埋场对地下水环境的污染程度。
In order to study the risk of groundwater pollution in landfill, based on the analysis of the hydrogeological conditions in the study area, analytic method was used to calculate and predict two kinds of non-normal working conditions of instantaneous leakage and continuous leakage of COD and NH_3-N in the regulation tank The case of migration. The results show that the COD and NH_3-N influence range of this landfill is 1 500 m under the condition of instantaneous leakage of control pond. After the continuous leakage of the control pond, the influence range of COD after 136 days is 500 m, NH_3 After 54 years, the influence range of N is 500 m, which has a certain impact on the downstream groundwater. Accordingly, corresponding protection measures under abnormal conditions are put forward, which can effectively reduce the pollution degree of landfill to groundwater environment.