湖南某化工厂重金属污染土壤修复试验研究

Experimental Study on Remediation of Heavy Metal Contaminated Soil in a Chemical Plant in Hunan Province

以湖南某化工厂砷锑铅污染土壤为研究对象,利用试验探索合适、适量的修复剂对重金属砷锑污染土壤的修复效果,筛选出适用药剂及配比,确定最优的稳定化修复条件。结果表明:污染土壤∶氧化钙∶硫酸亚铁∶磷酸二氢钾∶硅藻土重量比为94∶2∶2∶1∶1,将土壤、药剂按配比搅拌均匀后加入30%去离子水搅拌均匀,常温养护7 d后,经修复处理后的土壤中浸出浓度符合《地下水环境质量标准》(GB/T14848-2017)Ⅳ类质量标准,经过10 a的酸雨淋洗没有发生返溶现象,具有长期稳定的效果,对人体健康无影响。

In this paper,the As-Sb-Pb contaminated soil from a chemical plant in Hunan was studied,the appropriate amount of remediation agent on the remediation effect of heavy metal As,Sb contaminated soil was explored by the experiment,the suitable agent and ratio were selected,and determined the optimal stable remediation conditions.The results showed that when the weight ratio of polluted soil,calcium oxide,ferrous sulfate,potassium dihydrogen phosphate and diatomite was 94∶2∶2∶1∶1,after mixing the soil and agent according to the proportion,30% deionized water was added and mixed them evenly.After curing at room temperature for 7 days,the leaching concentration of the soil met the class Ⅳ quality standard of environmental quality standard for groundwater(GB/T14848-2017).After ten years of acid rain washing,there is no phenomenon of back dissolution.The stability effect has long-term stability and has no impact on human health.