淋洗法去除土壤中铬污染的研究

以东北地区某六价铬堆放场地表土壤为实验目标,利用不同酸度溶液淋洗土壤样品,以去除样品中高浓度的铬元素,实验探究了淋洗液pH值、淋洗时间、土壤颗粒大小对去除效率的影响,得出最佳反应条件:当pH为13,连续淋洗超过15d,可明显去除土壤中高浓度的铬元素,其最终铬含量为102mg/kg,去除效率达到87.12％,符合国标(G...

Leaching method to explore the removal of chromium in soil

Choose the surface soil near the dump of hexavalent chromium as the experimental target.Make leaching experiments on the soil to remove the high concentrations of chromium in it with different acidity solutions.Experiments show that: The removal efficiency has important links with the the eluent pH value,leaching time,soil particle size and other factors.The Cr(Ⅵ) concentration in the soil was 102 mg/kg,this meet the national standard(GB15618-1995) of the type II soil,and the removal efficiency was 87.12%,when the experimental conditions were as follows: pH for 13,continuous injector more than 15 days.Compared with traditional methods of remove the chromium in soil,this method has the advantage of easy to operate,less time-consuming,low energy consumption,cost,etc.To some extent,it is the improvement of traditional methods.