复配淋洗剂对不同来源砷污染土壤的修复研究

Study on the Remediation of Arsenic Contaminated Soil from Different Sources by Using Compound Leaching Agents

淋洗是一种根除效果好的污染土壤修复技术,在不同来源砷污染土壤中,药剂类型和砷去除率差异较大。有必要研究单一淋洗和复合淋洗对砷污染土壤的修复效果,分析砷形态对淋洗效果的影响。结果显示,草酸(浓度为0.1 mol/L)和磷酸二氢钾(浓度为0.1 mol/L)复配淋洗对砷的去除效果最佳。土壤淋洗时,重金属形态、土壤粒径、阳离子交换量和pH对土壤中砷的去除率有重要影响。研究土壤特性和淋洗条件对土壤中砷去除的影响,可为污染场地修复及生态环境风险评价提供理论支撑。

Leaching is a highly effective remediation technique for contaminated soil,and there are significant differences in the types of pesticides and arsenic removal rates in soils contaminated with arsenic from different sources.It is necessary to study the remediation effect of single and composite leaching on arsenic contaminated soil,and analyze the influence of arsenic forms on the leaching effect.The results show that the combination of oxalic acid(concentration 0.1 mol/L)and potassium dihydrogen phosphate(concentration 0.1 mol/L)has the best removal effect on arsenic.During soil leaching,the forms of heavy metals,soil particle size,cation exchange capacity,and pH have important effects on the removal rate of arsenic in the soil.Studying the effects of soil characteristics and leaching conditions on arsenic removal in soil can provide theoretical support for remediation of polluted sites and ecological environment risk assessment.