矿区污染土壤的土柱模拟淋洗修复研究

Study On Rinse Effect of Contaminated Soil in Mining Area By Biosurfactant

以某矿区的污染样品为研究对象,采集表层土壤､中层土壤以及深层土壤,对各深度的土壤进行基本理化性质分析,并进行土柱模拟试验。结果表明:清水对土壤中铅､锌的淋洗效果不明显,淋洗率在10%以下;EDTA对污染土壤中铅､锌的最佳淋洗时间分别为8 h和7 h,去除率分别为32.21%和28.01%。达到最佳淋洗时间后,EDTA对土壤中铅､锌的淋洗效率变化不大,逐渐趋于平缓。

Taking the contaminated samples from a mining area as the research object,surface soil,middle soil and deep soil were collected and the basic physical and chemical properties of the soil at various depths were analyzed.Also,the soil column simulation experiments were carried out.The results show that the rinse effect of clean water on lead and zinc in soil is not obvious,and the rinse rate is below 10%;the best rinse time of EDTA for lead and zinc in contaminated soil is 8 h and 7 h,respectively,the removal rates are 32.21%and 28.01%,respectively.After reaching the optimal rinse time,the rinse efficiency of EDTA on lead and zinc in the soil does not change much,and gradually tends to be flat.