某典型有机污染场地健康风险评估研究

Research on health risk assessment of a typical organic pollution site

以某典型有机污染场地为例,开展了土壤和地下水多层次健康风险评估,根据采样分析结果确定了场地特征参数和受体暴露参数,推算出场地污染修复范围及修复量。调查结果表明,该场地污染类型主要为土壤和地下水,土壤关注污染物为镉、3,3-二氯联苯胺,地下水关注污染物为3,3-二氯联苯胺。风险评估结果显示,场地土壤中镉和3,3-二氯联苯胺所有暴露途径的总致癌风险大于10^(-6),土壤中镉的非致癌危害商大于1,均高于人体可接受风险水平。土壤和地下水中3,3-二氯联苯胺的建议修复目标值分别为3.4 mg/kg、3.79×10^(-4) mg/L,土壤中镉的风险修复目标值为36 mg/kg。氯碱厂土壤受3,3-二氯联苯胺污染的待修复土方量约为44005.5 m^(3),受镉污染的待修复土方量约为2151 m^(3),其中3,3-二氯联苯胺和镉污染面积有一定的重叠,重叠区域待修复土方量约为1000 m^(3)。

Taking a typical organic pollution site as an example,a multi-level health risk assessment of soil and groundwater was carried out.Based on the sampling analysis results,the site characteristic parameters and receptor exposure parameters were determined,and the site pollution remediation scope and remediation amount were calculated.The survey results showed that the pollution types of the site were mainly soil and groundwater,the pollutants of concern in soil were cadmium and 3,3-dichlorobenzidine,and the pollutants of concern in groundwater were 3,3-dichlorobenzidine.The risk assessment results showed that the total carcinogenic risk of cadmium and 3,3-dichlorobenzidine in the soil of the site was greater than 10^(-6),and the non-carcinogenic hazard quotient of cadmium in the soil was greater than 1,which were higher than acceptable levels for humans risk level.The recommended remediation target values of 3,3-dichlorobenzidine in soil and groundwater were 3.4 mg/kg and 3.79×10^(-4) mg/L,respectively and the risk remediation target value of cadmium in soil was 36 mg/kg.The 3,3-dichlorobenzidine-contaminated soil in the chlor-alkali plant was about 44005.5 m^(3) to be rehabilitated,and the cadmium-contaminated soil to be rehabilitated was about 2151 m^(3),of which 3,3-dichlorobenzidine the chlorinated benzidine and cadmium pollution areas overlap to a certain extent,and the amount of earthwork to be repaired in the overlapping area was about 1000 m^(3).