MICP技术对Mn(Ⅱ)、Cr(Ⅵ)污染土壤的修复效果  

The remediation effect of MICP technology on[KH*8D][JZ]Mn(Ⅱ)and Cr(Ⅵ)contaminated soil

作　　者：许朝阳[1] 张贺 杨贺[1] 许宁 XU Zhaoyang;ZHANG He;YANG He;XU Ning(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225009

出　　处：《扬州大学学报（自然科学版）》2020年第2期73-78,共6页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51278446);江苏省科技厅前瞻性联合研究资助项目(BY2016069-05)。

摘　　要：利用微生物诱导碳酸盐沉积(microbially induced carbonate precipitation,MICP)技术处理Mn(Ⅱ)、Cr(Ⅵ)污染土及Mn(Ⅱ)、Cr(Ⅵ)混合溶液,研究MICP技术对重金属污染土的修复效果,重金属离子在土壤修复过程中的竞争关系,以及pH值对已修复土壤稳定性的影响.实验结果表明:经微生物矿化修复后,单一重金属污染土中可交换态锰、铬离子的去除率分别为85.64%和77.56%;经修复的Mn(Ⅱ)、Cr(Ⅵ)混合污染液中可交换态锰离子的去除率大于铬离子;酸性条件影响污染土的修复稳定性,土壤中可交换态锰、铬离子含量随pH值减小而增加.Microbially induced carbonate precipitation(MICP)technology is used to remediate Mn(Ⅱ)and Cr(Ⅵ)contaminated soil separately,and to dispose the solution containing Mn(Ⅱ)and Cr(Ⅵ).The effect of MICP technology on the remediation of heavy metal contaminated soil,the competitive relationship between heavy metal ions during the process of bioremediation,and the stability of bioremediated soil in acidic environment are studied.The results show that the removal rate of exchangeable Mn(Ⅱ)and Cr(Ⅵ)in single heavy metal contaminated soil is 85.64%and 77.56%respectively after the bioremediation.The removal rate of exchangeable Mn(Ⅱ)is higher than that of exchangeable Cr(Ⅵ)in Mn(Ⅱ)and Cr(Ⅵ)composite solution.The acidic environment has impact on the bioremediation stability of contaminated soil,and as the pH value decreases,the content of exchangeable Mn(Ⅱ)and Cr(Ⅵ)increases.

关 键 词：微生物诱导碳酸盐沉积 污染土 重金属污染 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]