某有色金属冶炼在产企业土壤污染状况调查和风险管控

Detailed Investigation and Risk Control of Soil Pollution in a Nonferrous Metal Smelting Enterprise

为探索在产企业土壤污染状况详细调查和风险管控措施,以西南地区某有色金属冶炼企业为例,采用分区布点法布设38个土壤点位和4个地下水监测井。详细调查结果表明,该企业0~0.5、0.5~2.0、2.0~4.0 m^(3)个土壤层位中,9个点位的11个样品重金属钒超过第二类用地筛选值,7个点位的8个样品超过第二类用地管制值,1个点位1个表层样品出现重金属钴超过第二类用地筛选值,低于第二类用地管制值;地块风险评估表明,重金属钒和钴都超过可接受的风险水平,风险控制值分别为752、70 mg/kg;最后,从技术适用性、成熟性、经济成本等方面,提出了采用厚度不低于20 cm混凝土阻隔硬化方式对14911.08 m^(2)重点区域进行风险管控,并定期开展土壤污染隐患排查、土壤和地下水监测工作。

In order to explore the detailed investigation of soil pollution situation and the implementation of risk control measures in the production enterprises,38 soil sites and 4 groundwater monitoring wells were distributed in a nonferrous metal smelting enterprise in southwest China.The detailed investigation results show that the enterprise is in three soil levels of 0~0.5,0.5~2.0 m and 2.0~4.0 m.The vanadium content of 11 samples at 9 sites exceeds the screening value of the second type of land,and 8 samples at 7 sites exceed the control value of the second type of land.The heavy metal cobalt in one surface sample was higher than the screening value of the second type of land and lower than the control value of the second type of land.The risk assessment of the plots showed that both vanadium and cobalt exceeded the acceptable risk levels,with the risk control values of 752,70 mg/kg;Finally,from the aspects of technical applicability,maturity and economic cost,it is proposed that the concrete with thickness not less than 20cm should be used to block and harden the risk control in the key area of 14911.08m^(2),and regularly carry out the investigation of potential soil pollution hazards,soil and groundwater monitoring.