上海某锑污染地块不同粒径土壤中锑的分布特征及EDTA淋洗修复研究  

Distribution characteristics and EDTA leaching and remediation research of antimony in soil with different particle sizes in Shanghai

作　　者：黄伟强 HUANG Wei-qiang

机构地区：[1]上海艾库环境工程有限公司,上海201419

出　　处：《节能》2022年第5期68-70,共3页Energy Conservation

摘　　要：试验采集上海某锑(Sb)污染地块的表层土壤,研究污染地块的土壤粒径组成、Sb在不同粒径土壤中的分布特征及不同浓度乙二胺四乙酸(EDTA)溶液的淋洗修复效果。结果表明:粒径<0.15 mm的细小颗粒土壤,质量占比为(56.37±2.84)%;Sb在不同粒径土壤中的含量随着粒径的增大而减小,粒径<0.15 mm的土壤,Sb含量均值为(168.33±4.84) mg/kg,大于修复目标值,其他粒径组分土壤中Sb含量均低于修复目标值。土壤中Sb去除效果随EDTA浓度的增加而增加,EDTA浓度为0.03 mol/L时,去除率可达90%以上,残留量低于修复目标值。因此,本污染地块应先筛分,再进行土壤淋洗修复,以0.15 mm作为筛分土壤粒径分界线,<0.15 mm粒径土壤,在淋洗时间为2 h、水土比为5∶1,EDTA溶液浓度为0.03 mol/L的条件下进行淋洗修复。The surface soil of an antimony(Sb)-contaminated plot in Shanghai was collected in the experiment to study the composition of soil particle size, the distribution characteristics of Sb in soil with different particle sizes, the leaching and remediation effect of EDTA solution with different concentrations. The results showed that the fine-grained soil with particle size <0.15 mm accounted for(56.37±2.84)% by mass, the content of Sb in soil with different particle sizes decreased with the increase of particle size, and the content of Sb in soil with particle size <0.15 mm decreased. In the soil,the average Sb content was(168.33±4.84) mg/kg, which was greater than the restoration target value, and the Sb content in the soil of other particle size components was lower than the restoration target value. The removal efficiency of Sb in soil increased with the increase of EDTA concentration. When the EDTA concentration was 0.03 mol/L, the removal rate could reach more than 90%, and the residual amount was lower than the restoration target value. Therefore, this contaminated plot should be sieved first, and then soil leaching and remediation should be carried out. With 0.15 mm as the boundary of the sieved soil particle size, the soil with a particle size lower than 0.15 mm should be leached for 2 h and the water-soil ratio should be 5∶1. Wash and repair under the condition that the concentration of EDTA solution is 0.03 mol/L.

关 键 词：污染地块 土壤粒径 质量占比 锑含量 EDTA 淋洗修复 

分 类 号：X53[环境科学与工程—环境工程]