有机污染场地地下水风险评价指标体系构建的探讨

污染场地中的有机污染物严重威胁着地下水环境。本文针对化工企业排放的废水、废渣对地下水环境的影响,在地下水环境承载力影响因素、污染场地污染物渗入影响因素识别的基础上,依据指标选取的科学性、针对性、可操作性原则,构建了风险评价指标体系,给出了各指标的选取原则和赋值方法,并应用于典型有机污染场地进行地下水风险评价指标体系的检验。结果表明,在地下水天然防污能力低、污染场地潜在风险高的区域,地下水处于高风险区,而地下水天然防污能力高、污染场地潜在风险低的区域,地下水风险等级低,评价结果可靠。该指标体系的构建、指标的选取原则和赋值方法是合理的,具有实际运用价值。

Investigation on the Establishment of Index System for Groundwater Risk Assessment at the Organically Contaminated Site

Organically contaminated site imposed serious threat to groundwater environment.This paper aims at the influence on groundwater environment of chemical industry’s wastewater and waste solid.On the basis of distinguishing the factors affecting groundwater environmental bearing capacity and pollutant infiltration,the index system for groundwater risk assessment was established with scientific,pertinent and operational principles.Furthermore,the assignment method and selection principle of every index were given.Then,the index system was applied to groundwater risk assessment at a typical organically contaminated site.The assessment results showed the groundwater pollution risk was high in the area with high groundwater natural anti-fouling ability and low site contaminated risk.On the other hand,the groundwater pollution risk was low in the area with high groundwater natural anti-fouling ability and low potential site contaminated risk.The assessment result was reliable.The research showed the index system and its section principle and assignment method were reasonable,and it is of practical application value.