EDTA淋洗修复Pb、Cd重金属污染土壤

EDTA leaching repair Pb、Cd heavy metal contaminated soil

重金属污染土壤的修复已经成为土壤应用的重大问题.而土壤淋洗技术由于其适用污染物范围广、具有治理效果稳定、修复效率高的特点,本文首先通过室内振荡淋洗法修复重金属污染土壤,得到EDTA适宜的淋洗浓度,再通过室内的土柱淋洗试验修复重金属污染土壤.有实验结果分析可知,室内振荡淋洗时Cd的去除随着EDTA的浓度增加,先增大后减小; Pb的去除率随着EDTA的浓度增加一致增大,但是增加趋势逐渐变缓.土柱淋洗时EDTA浓度为0. 1mol/L对重金属的去除率较大,与振荡淋洗的结果相符.

The remediation of heavy metal contaminated soil has become a major issue in soil application. The soil leaching technology has the characteristics of wide range of applicable pollutants,stable treatment effect,and high repair efficiency. This article first used indoor shaking leaching to repair heavy metal contaminated soil,and obtained the appropriate EDTA concentration,and then through the indoor soil. Column leaching test to repair heavy metal contaminated soil. According to the analysis of experimental results,the removal of Cd during the internal shaking leaching increases with the increase of EDTA concentration and then decreases; the removal rate of Pb increases consistently with the increase of EDTA concentration,but the increasing trend gradually decreases. The EDTA concentration of 0. 1 mol/L during soil column elution was greater for removal of heavy metals,which was consistent with the result of oscillating elution.