典型电镀污染场地重金属污染特征与环境风险评价

Pollution Characteristics and Environmental Risk Assessment of Heavy Metals in Typical Electroplating Contaminated Site

以某电镀基地为研究对象,分析场地的重金属污染特征。结果表明,该基地受到铬、铜、镍、锌、银等重金属及氰化物污染,部分污染物指标超过评价标准值60多倍,且空间差异明显;基于美国《土壤筛选导则》计算人体健康的环境风险表明,该基地六价铬、镍等重金属超过致癌风险指数标准限值(10-6)及非致癌危害熵标准限值(1),说明镍与六价铬在局部区域存在一定的环境风险。因此在污染场地再利用过程中需要对具有环境风险的区域进行修复处理。

An electroplating base was taken as an example to analyze the pollution characteristics of heavy metals at the site. The results showed that the base was polluted by heavy metals such as chromium, copper, nickel, zinc and silver and by cyanide, with the concentrations of some pollutants exceeding more than 60 times over the standard values. The spatial variation of the pollutants was significant. By using US EPA Soil Screening Guidance, the human health environmental risks were evaluated. It was found that the environmental risk values of chromium （VI） and nickel, etc. were more than the carcinogenic threshold limit value （10-6） and non-carcinogenic risk limit value （ 1 ）, indicating that there existed some environmental risk of chromium （ W[ ） and nickel in the area. Therefore, in the reclamation of contaminated sites, the remediation treatment should be carried out for the areas with environmental risks.