某退役磷化工场地重金属及氟化物复合污染土壤异位固化/稳定化修复试验研究

Study on the Remediation Effect of Heavy Metal and Fluoride-contaminated Soil from a Phosphate Fertilizer Plant Decommissioning Site with Solidification and Stabilization Agents

针对某退役磷化工场地重金属及氟化物复合污染土壤,开展异位固化/稳定化修复效果试验研究。对测试土壤样品分别采用固化/稳定化药剂A-Ⅰ、A-Ⅱ、A-Ⅲ、A-Ⅳ、A-Ⅴ投加不同比例(3%、5%、7%)进行多组试验,对修复前后土壤进行浸出毒性分析,以评价固化/稳定化药剂类型、药剂投加比等特性与污染土壤修复效果之间的差异。结果表明:A-Ⅰ、A-Ⅱ系列药剂对重金属及氟化物复合污染土壤有较好的固化/稳定化效果,A-Ⅲ对重金属污染土壤固化效果显著。

For the heavy metal and fluoride compound polluted soil in a decommissioned phosphorus chemical site,an experimental study on the effect of ex-situ solidification/stabilization remediation was carried out.The test soil samples were tested by adding different proportions(3%,5%,7%)of curing/stabilizing agents A-Ⅰ,A-Ⅱ,A-Ⅲ,A-Ⅳ,and A-Ⅴto conduct multiple experiments.The soil before and after remediation was subjected to leaching toxicity analysis to evaluate the difference between the type of curing/stabilizing agent,the dosage ratio of chemicals and other characteristics and the remediation effect of contaminated soil.The results show that:A-Ⅰ,A-Ⅱseries of agents have better solidification/stabilization effect on heavy metal and fluoride composite polluted soil,and A-Ⅲhas significant solidification effect on heavy metal polluted soil.