西南某锑砷复合污染地块稳定化修复技术应用工程案例

Engineering Case of Stabilization Technology for an Antimony-arsenic Contaminated Soil in Southwest China

原地异位稳定化修复技术具有快速、经济、有效等优点,在重金属污染土壤修复中得到了广泛应用,然而对锑砷等复合污染土壤的稳定化修复研究和应用还较少。文章首先利用小试试验探究了不同修复材料添加比对锑砷复合污染土壤的修复效果,筛选出最佳药剂添加量,并通过现场中试进一步验证。项目实施过程中将污染土壤按锑浸出浓度进行分类,做到精准治理、成本节约、施工便捷,建立了一套标准化施工工艺流程,为类似锑砷等复合重金属污染土壤修复提供经验借鉴。

Ex-situ stabilization at original site is fast,economical and effective.It has been widely used in the remediation of heavy metal contaminated soils.However,there is still lttle research and application on the stabilization of antimony-arsenie contaminated soils.This article first used small-scale experiments to explore the remediation effects of different remediation material addition ratios on antimony-arsenic contaminated soils,screened out the optimal dosage of chemicals,and further verified it through on-site pilot tests.During the implementation of the project,the contami nated soil was clasified according to the antimony leaching concentration to achieve precise treatment,cost saving,and convenient construction.A set of standardized construction processes was established to provide experience and reference for the remediation of contaminated soils by combined heavy metals such as antimony and arsenic.