单一及复合环境友好型淋洗剂修复铅污染土壤

为了探索一种针对重金属铅(Pb)的高效环境友好型淋洗剂，采用水平实验法探究了乙二胺四亚甲基膦酸(EDTMPA)、聚酰胺酸(PAA)、鼠李糖脂三种淋洗剂对Pb污染土壤的淋洗特征，使用响应面法对EDTMPA和PAA进行了淋洗参数优化.首次将这两种螯合剂EDTMPA，PAA与表面活性剂鼠李糖脂复合淋洗.结果表明，单独淋洗时，EDTMPA的效果最佳，最佳淋洗参数为质量分数2.3%，pH 5.7，淋洗时间167min，对Pb的去除率为57.6% .鼠李糖脂复合EDTMPA对Pb的最大去除率为70.9%，比EDTMPA单独淋洗提高了12%;鼠李糖脂复合PAA的最大去除率为63.3%，比PAA单独淋洗提高了16%.鼠李糖脂复合EDTMPA是一种高效且环境友好型淋洗剂.

Remediation of Lead-Contaminated Soil by Single and Compound Environment-Friendly Leaching Agents

The leaching characteristics of ethylenediamine tetra methylene phosphonic acid(EDTMPA)， polyamic acid(PAA) and rhamnolipid on removing Pb from contaminated soil were studied to develop a high-efficiency and environment-friendly leaching agent for Pb contaminated soil by horizontal experiments， and response surface methodology(RSM)was applied to optimize the parameters of these two eluents. For the first time， combinations of the biosurfactant rhamnolipid and two chelating agents EDTMPA and PAA were used to leach contaminated soil of Pb. The results showed that EDTMPA has the best leaching effect among these three eluents， and the optimal operation parameters were concentration 2.3%， pH 5.7， leaching time 167min and the removal rate of Pb can reach 57.6%. The highest removal rate of rhamnolipid combined with EDTMPA was 70.9%， which was 12% higher than that of EDTMPA alone. The highest removal rate of rhamnolipid compound PAA was 63.3%， which was 16% higher than that of PAA alone. Rhamnolipid combined with EDTMPA is an environment-friendly eluent with the highest removal rate.