EICP联合生物炭固化修复重金属污染土试验  

EXPERIMENTAL STUDY ON REMEDIATION OF HEAVY METAL CONTAMINATED SOIL BY EICP COMBINED WITH BIOCHAR

作　　者：陆爱灵 朱东云 张宏 曹函 张婧 LU Ailing;ZHU Dongyun;ZHANG Hong;CAO Han;ZHANG Jing(School of Earth Science and Information Physics,Central South University,Changsha 410083,China;Shangtian Environmental Restoration Co.,Ltd.,Changzhou 213022,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]上田环境修复有限公司,江苏常州213022

出　　处：《环境工程》2023年第8期176-180,共5页Environmental Engineering

摘　　要：脲酶诱导碳酸钙沉淀(enzyme induced calcite precipitation,EICP)作为一种新型仿生物矿化技术,对修复重金属污染土壤表现出较大潜力。开展EICP联合生物炭修复铅污染土中的探究试验,通过毒性浸出和碳酸钙量测试,评价固化效果并分析其作用机制。结果表明:EICP可有效固化铅,当EICP处理试剂加入量为6.6%时的固化率最高,并呈现固化率随着碳酸钙量增加而增大规律;与单一使用EICP相比,EICP联合生物炭修复固化铅污染土的效果显著提高,且生物炭掺入量为6.6%时固化率最高;EICP联合生物炭提高铅固化效果机制为:一是由于生物炭呈碱性,比表面大利于吸附金属等特性固化铅;二是生物炭的大量微小孔隙,为EICP矿化反应提供场所,促进EICP矿化反应。研究结果可为使用EICP技术修复重金属污染土提供新思路及试验指导。Urease induced calcite precipitation(EICP),a new biomimetic mineralization technology,shows great potential in repairing heavy metal contaminated soil.The technical routine of combining EICP with biochar to solidify Pb in contaminated soil was carried out,and the solidification effect was evaluated and the mechanism was discussed by toxicity leaching and calcium carbonate content test.The result showed that EICP could effectively solidify Pb,and the solidification rate was the highest when the amount of EICP treatment reagent was 6.6%,and the solidification rate increased with the increase of calcium carbonate content.Compared with EICP applied alone,EICP combined with biochar significantly improved the curing effect of lead-contaminated soil,and the incorporation amount of biochar was 6.6%,showing the highest solidification rate.The mechanism of EICP combined with biochar to improve the Pb solidification effect,was that the biochar is alkaline and can adsorb Pb on a large specific surface area,and the numerous tiny pores of the biochar can provide a site for the EICP mineralization reaction.This study provided new ideas and experimental guidance for EICP remediation of heavy metal contaminated soil.

关 键 词：EICP 固化 修复 生物炭 污染土 重金属 

分 类 号：TQ127.11[化学工程—无机化工] X53[环境科学与工程—环境工程]