黄石市铁山区某废弃矿区环境调查与风险评估

    Environmental Investigation and Risk Assessment of an Abandoned Mining Area

    • 摘要: 为了给黄石市铁山区某矿区的土壤修复和土地利用规划提供基础数据, 该研究调查了矿区土壤、地下水和地表水的污染状况, 分析了土壤和水体的生物毒性并对土壤重金属生态风险进行了评估。结果表明, 生产场地存在一定程度重金属污染, 主要为As、Cr、Cu、Ni、Cd、Pb等。地表水和地下水中重金属检出量均较低, 分别满足GB3838-2002《地表水环境质量标准》中的Ⅲ类标准和GB/T14848-2017《地下水质量标准》中的Ⅴ类标准。生物毒性分析结果表明, 13.8%的土壤点位对植物种子发芽造成"中性"毒性, 其余为低毒水平; 所有水体样品皆未对发光菌生长造成毒性效应。风险评估结果表明, 在第2类用地(非敏感用地)方式下超风险筛选值的区域面积为2 307 m2; 重金属有效态风险等级3级及以上和生态风险为较强及以上区域对应的面积为48 642 m2, 高生态风险区域的面积为49 135m2。研究为该矿区后期风险管控方案编制和治理修复工作提供了依据, 可确保土壤质量满足规划用地要求。

       

      Abstract: In order to provide basic information for soil remediation and land use planning of an abandoned mining area in Tieshan District, Huangshi City, pollution status of soil, groundwater and surface water were investigated, the biological toxicity of soil and water were analyzed and the ecological risk of heavy metals in soil were assessed in the present study. The results show that certain heavy metal pollution occurred in the production site, mainly as As, Cr, Cu, Ni, Cd and Pb; The concentrations of heavy metals in surface water and groundwater were low, which met the quality standard of Class Ⅲ in Surface Water Environmental Quality Standards (GB 3838-2002) and Class Ⅴ in Groundwater Quality Standards (GB/T 14848-2017), respectively. Toxicological results show that 13.8% of soil sampling sites were toxic to plant seed germination, and the rest had low toxicity level. All of the water samples had no toxic effects on the growth of luminescent bacteria. Risk assessment results indicate that the area exceeding the risk screening were 2 307m2 under Class II land (non-sensitive site). The area corresponding to the Class Ⅲ or higher risk of effective heavy metals and strong or higher ecological risk were 48 642 and 49 135 m2, respectively. The results of this study can provide a basis for the risk control scheme and remediation measures for the mining area to ensure that the soil quality meets the requirements of the planned land use.

       

    /

    返回文章
    返回