异位淋洗在城区典型重金属污染地块修复中的应用研究

Application of Ex-situ Leaching in Restoration of Typical Heavy Metal contaminated Plots in Urban Areas

在城市更新建设中,工矿企业搬迁,遗留场地多被重金属污染,目前修复技术的研究多集中于室内试验或理论分析,对实际工程中的规模化应用研究鲜有报道。基于上海某典型重金属污染地块修复工程,结合室内小试试验,详细介绍了异位土壤淋洗技术修复重金属污染土壤的施工工艺。修复结果显示以环境友好型柠檬酸溶液为淋洗剂的异位土壤淋洗技术能够有效去除土壤中的重金属污染物,且修复前后土壤的理化性质改变较小,潜在二次污染小,适合重金属污染地块修复工程的规模化应用。

In urban renewal construction, industrial and mining enterprises are relocated, and most of the leftover sites are heavy metal contaminated sites. The current research on repair technology mostly focuses on laboratory experiments or theoretical analysis, and there are few reports on large-scale application research in practical engineering. Based on the restoration project of a typical heavy metal contaminated land plot in Shanghai, this study introduces the construction technology of ex-situ soil leaching technology to remediate heavy metal-contaminated soil in detail, combined with laboratory experiments. The remediation results show that the ex-situ soil leaching technology using environmentally friendly citric acid solution as the eluting agent can effectively remove heavy metal pollutants in the soil, and the physical and chemical properties of the soil before and after remediation change little, and the potential secondary pollution is small, suitable for heavy metals. Large-scale application of contaminated land remediation projects.