生物炭组配膨润土对铬污染土壤原位钝化修复效果

In-situ Immobilization Remediation Effect of Biochar and Bentonite on Cr-polluted Soil

选取生物炭、生物炭组配膨润土,通过工业遗留场地现场修复和调控试验,研究两种钝化材料对重金属Cr污染土壤的重金属形态变化的影响。结果表明:生物炭、生物炭组配膨润土两种处理对TCLP提取态Cr的降低率分别为77.73%和95.40%,两种钝化剂均有效抑制了Cr在土壤中的溶解和迁移。生物炭和膨润土组配使用的钝化效果优于生物炭,显示了不同钝化作用机理间的有效协同。

Biochar,combination of biochar and bentonite were selected to study their effects on the variation of heavy metal speciation in Cr-polluted soil using a manipulation experiment for remediation in a brownfield site.Results showed that biochar,combination of biochar and bentonite brought down the concentrations of TCLP extractable Cr by77.73% and 95.40%,respectively.The dissolution and migration of Cr were inhibited by both two immobilizing agents.Combination of biochar and bentonite showed better immobilization effectiveness,indicating the synergetic effect between different immobilization mechanism.