典型固废拆解区域土壤重金属污染风险及修复

Risk Assessment and Remediation of Agricultural Soil Contaminated with Heavy Metals in E-waste Recycling Area

为评价整治后典型固废拆解区域农田土壤重金属的污染程度,采集区域农田土壤样品212个,分析7种重金属(Cd、Cr、Cu、Hg、Ni、Pb和Zn)的质量分数。结果表明,研究区域农田土壤重金属污染现象仍普遍存在,Cd和Cu污染以中、重度污染为主,Pb污染以轻微、轻度污染为主,其中重点污染区块土壤中重金属污染的非致癌风险和致癌风险已超出可接受水平,须开展土壤修复工作。修复小试表明,皂角苷作为淋洗液对重金属具有较强的洗脱作用,具有较好的工程实践前景。

In order to assess heavy metals pollution in agricultural soil after renovation in typical e-waste recycling areas, 212 soil samples were collected and the mass fractions of 7 kinds of heavy metals （Cd, Cr, Cu, Hg, Ni, Pb and Zn） were analyzed. The results indicated that heavy metals pollution in agricultural soil was commonly existed in the study areas, the soil was slightly contaminated by Ph but was moderately or criti- cally polluted by Cu. However, the carcinogenic risk and non-carcinogenic risk status by heavy metals pollution were beyond acceptable levels, soil remediation was quite necessary. After some investigations of bioremediation, it was found that saponin as a washing agent could highly strengthen the behavior of heavy metals desorption from soil, which had a good prospect of engineering practice.