汞污染土壤的电动力学修复试验研究  

Experimental study on electrokinetic remediation of mercury contaminated soil

作　　者：周鸣[1] 朱书法[1] 许景明[1] 姚梦雅[1] 孙岚峰 

机构地区：[1]河南科技大学化工与制药学院,河南洛阳471023

出　　处：《环境污染与防治》2015年第8期21-25,共5页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.41471256);河南省高等学校重点科研项目(No.15A610003)

摘　　要：利用电动力学修复汞污染土壤,并考察电动力学修复对土壤部分理化指标的影响。结果表明,常规的电动力学修复方法不能有效去除土壤中的汞污染物,需要一些强化措施,在阴极电解液中引入KI,KI的引入提高了修复过程中的电流,且KI会与汞化合物生成HgI2-4,提高了汞的迁移效率,从而改善了电动力学修复效果。同时,添加0.50mol/L的KI溶液的试验组具有最佳的修复效果,在此试验条件下,污染土壤中的汞总去除率为81.7%。电动力学修复后,土壤pH有明显改变,阳极区土壤酸化,阴极区土壤碱化;土壤有效氮在阳极区出现明显增加,在阴极区降低,而土壤有机质则没有明显变化。Electrokinetic technology was used to remedy of mercury contaminated soil and its impact on some physicochemical properties of soil was studied. Experimental results showed that conventional electrokinetic technolo- gy was ineffective in removing mercury pollutants from soil and it need to be improved. KI increased the removal effi- ciency of mercury from contaminated soil,because it enhanced electrical current and the migration of mercury to the electrolyte by the formation of Hgl4^2-. Meanwhile, the best mercury removal efficiency appeared in the experimental group of 0.50 mol/L KI. About 81.7 % mercury pollutants were removed from contaminated soil by electrokinetic re- mediation at the 0.50 mol/L KI concentration. After electrokinetic treatment, there was a significant change in soil pH. The soil pH in the anode region became acidic and that in the cathode region became alkaline. After electrokinetic treatment, the concentration of soil available nitrogen in the anode region increased significantly and that in the cathode region decreased,and there was no significant change in soil origanic matter.

关 键 词：电动力学修复 KI 汞 土壤 

分 类 号：X53[环境科学与工程—环境工程]