土木与环境工程学报（中英文）2024，Vol.46Issue(5)：26-37,12.DOI:10.11835/j.issn.2096-6717.2023.082
植物-电动耦合修复重金属污染土的效能及其强化机制
Remediation efficiency and strengthening mechanism of heavy metal contaminated soil under phytore-electric coupling treatment
摘要
Abstract
The purification degree of heavy metal contaminated soil directly affects its reuse.This paper took the soil contaminated with Cd,Cu,Ni,Zn and Pb as the research object,and the improved surround electrode arrangement as the testing method.The purification degree and soil properties of contaminated soil under phytore-electric coupling remediation were used as indicators to examine the key factors and reveal the enhancing mechanism.The results demonstrate that the removal rate of phytore-electric coupling remediation is higher than that of single one,and the occurrence form of heavy metals and the response of plants to heavy metals are the key factors.The method of improved surround electrode arrangement can actively mobilize the migration and then accumulation of heavy metals in a larger range of soil to plant roots,and then solve the problem of low accessibility and biological activity of heavy metals in sole phytoremediation.The assistance of phytoremediation is beneficial to relieve the adverse effects of electrokinetic remediation on soil properties,and solves the problem of concentrating effect and high energy consumption.The coupling remediation combined the improvement of spatial distribution and bioavailability of heavy metals,metabolism of plant,and life activities of soil microbial,which effectively improve the purification of heavy metal contaminated soil.After remediation,the soil can maintain a stable pH of 6.27-7.91,and a conductivity of 108-159 μs/cm.In addition,the energy consumption is only 13.76-18.81 kW·h/m3.The phytore-electric coupling remediation method helps to promote the sustainable use of contaminated soil.关键词
土壤污染/净化修复/植物修复/电动修复/强化机制/重金属污染Key words
soil contamination/purification and remediation/phytoremediation/electrokinetic remediation/strengthening mechanism/heavy metals pollution分类
资源环境引用本文复制引用
李敏,赵博华,于禾苗,齐振霄,李辉..植物-电动耦合修复重金属污染土的效能及其强化机制[J].土木与环境工程学报（中英文）,2024,46(5):26-37,12.基金项目
国家自然科学基金(52278341、51978235) （52278341、51978235）
河北省自然科学基金(E2018202274) （E2018202274）
河北省科技创新战略基金(20180602) National Natural Science Foundation of China(Nos.52278341,51978235) （20180602）
Natural Science Foundation of Hebei(No.E2018202274) （No.E2018202274）
Science and Technology Innovation Strategic Foundation of Hebei(No.20180602) （No.20180602）
