EICP修复重金属污染土的环境耐久性研究  

Study on the environmental durability of heavy metal contaminated soil remediated by enzyme induced carbonate precipitation

作　　者：边汉亮 吉培瑞 王俊岭 张旭钢 徐向春 BIAN Han-liang;JI Pei-rui;WANG Jun-ling;ZHANG Xu-gang;XU Xiang-chun(School of Civil Engineering and Architecture,Henan University,Kaifeng,Henan 475004,China;Kaifeng Technology Research Center of Engineering on Soil Modification and Restoration,Henan University,Kaifeng,Henan 475004,China;Scivic Engineering Corporation,Luoyang,Henan 471003,China;The Second Construction Limited Company of China Construction Eighth Engineering Division,Jinan,Shandong 250014,China)

机构地区：[1]河南大学土木建筑学院,河南开封475004 [2]河南大学开封市特殊土改性与修复工程技术研究中心,河南开封475004 [3]机械工业第四设计研究院有限公司,河南洛阳471003 [4]中建八局第二建设有限公司,山东济南250014

出　　处：《岩土力学》2023年第10期2779-2788,共10页Rock and Soil Mechanics

基　　金：河南省科技攻关项目(No.222102320355);河南省科技研发计划联合基金(No.225200810005);河南省研究生教育改革与质量提升工程项目(No.YJS2021JD13);黄河水利委员会黄河水利科学研究院开放基金项目(No.LYRCER202102)。

摘　　要：为探究脲酶诱导碳酸钙沉淀(enzyme induced carbonate precipitation,EICP)技术修复重金属污染土的环境耐久性,分别对EICP修复后的锌、铅污染土进行酸液浸泡、冻融试验和雨淋试验,探讨了EICP修复锌、铅污染土在不同环境条件下的耐久性及其影响规律。结果表明,在不同浓度、不同类型酸液条件下,EICP修复后的锌、铅污染土中可交换态和碳酸盐结合态的重金属离子浸出量随p H值降低,碳酸盐结合态含量降低,可交换态含量逐渐增加,且硫酸环境下的稳定性大于硝酸环境下的稳定性;随着冻融循环次数的增加,EICP修复后的锌、铅污染土中可交换态离子浸出量增加,碳酸盐结合态含量减少;在大雨条件下,Zn^(2+)、Pb^(2+)主要在前20 min内进行释放,并由上往下迁移;经EICP修复重金属污染土在酸液、冻融循环和雨淋条件下具有良好的耐久性。To explore the environmental durability of heavy metal contaminated soil remediated by enzyme induced carbonate precipitation(EICP)technology,acid soaking,freeze-thaw tests,and rainfall tests were carried out on the zinc and lead contaminated soil after EICP remediation,respectively.The durability and influence of the zinc and lead contaminated soil remediated by EICP technique under different environmental conditions and the corresponding influence regularity were discussed in this paper.The results showed that under different concentrations and types of acid solutions,the leaching amount of heavy metal ions in exchangeable and carbonate bound forms in the zinc and lead contaminated soil after EICP remediation decreased with pH value,with the content of ions in carbonate bound forms decreasing and the content of ions in exchangeable forms gradually increasing.It was also found that the stability in sulfuric acid solution was greater than that in nitric acid solution.As the number of freeze-thaw cycles increased,the leaching amount of exchangeable ions in the zinc and lead contaminated soil remediated by EICP technique increased,while the content of ions in the carbonate bound form reduced.Under the condition of heavy rain,Zn^(2+)and Pb^(2+)were mainly released within the first 20 minutes and migrated from top to bottom.All the results demonstrate that the heavy metal contaminated soil remediated by EICP technology has a good durability under acid soaking,freeze-thaw cycles,and heavy rain.

关 键 词：锌、铅污染土 脲酶诱导碳酸钙沉淀(EICP) 酸液浸泡 冻融试验 雨淋试验 

分 类 号：X53[环境科学与工程—环境工程]