化学改良剂对矿区土壤中Cu和Cd的修复

摘要

[Objective] The research aimed to explore the rules of the interaction between chemical amendments (lime and fly ash) and Cu and Cd in the polluted soil. [ Method ] Sorption and soil incubation experiments were carried out. The effects of chemical amendments (lime and fly ash) on chemical forms of Cu and Cd were studied. [ Result] The leaching contents of Cu and Cd were lower than the threshold of the standard (TCLP,USEPA), when the dose of fly ash and lime in the soils were 5% and 0. 1 %( by soil weight) respectively. After adding the amendments to the polluted soil, the soluble and exchangeable related Cu and Cd decreased, while carbonate related heavy metal and organic complex Cu and Cd increased. [Conclusion] Fly ash and lime could effectively reduce the availability of heavy metals.%[目的]为了探明改良剂与土壤Cu和Cd的作用规律.[方法]通过解吸试验和土培试验,分析粉煤灰和石灰为化学改良剂对矿区土壤Cu和Cd化学形态的影响.[结果]当粉煤友和石灰用量分别为土重的5.00％和0.10％时,Cu和Cd的浸提量可控制在阈值内(TCLP,USEPA).[结论]粉煤灰和石灰可有效降低土壤重金属可提取态的含量.