生物浸出
环境修复
化学
环境化学
生物炭
生物修复
锌
土壤污染
污染
浸出(土壤学)
土壤水分
吸附
人体净化
铜
废物管理
环境科学
有机化学
土壤科学
工程类
生物
热解
生态学
作者
Weiran Feng,Xiao Xiao,Junjie Li,Qicheng Xiao,Ma Li,Qifeng Gao,Yuke Wan,Yutian Huang,Ting Liu,Xubiao Luo,Shenglian Luo,Guisheng Zeng,Kai Yu
出处
期刊:Chemosphere
[Elsevier]
日期:2023-01-02
卷期号:315: 137730-137730
被引量:21
标识
DOI:10.1016/j.chemosphere.2022.137730
摘要
Copper and zinc are toxic heavy metals in soils that require development of feasible strategies for remediation of contaminated soils around the mine areas. In this study, the processing conditions and mechanisms of immobilization and bioleaching for remediation of highly contaminated soils with heavy metals are investigated. Soil remediation is carried out using a bioleaching-immobilization bipolar method. The results show that LSE03 bacteria provide efficient leaching result and immobilization on Cu2+ and Zn2+. Among the bacterial metabolites, cis, cis-muconic acid and isovaleric acid play major roles in the bioleaching process. The bacterial extracellular polymeric substances are rich in a variety of organic acids that show a significant decrease in content after the adsorption process, indicating that all of these substances are involved in the binding of heavy metals. Characterization of the endophytes and immobilizing agents with FTIR, TEM-mapping, and XPS techniques reveal the ability of both bacteria and composites to adsorb Cu-Zn as well as the main functional groups of -OH, -COOH, -PO43-, and -NH. According to the heavy metals species analyses, competitive adsorption experiments, and bioleaching desorption experiments, it is planned to carry out the bipolar remediation of contaminated soil through immobilization followed by bioleaching process. After bipolar remediation processing, 97.923% and 96.387% of available Cu and Zn are respectively removed. Soils fertility significantly increases in all cases. Our study provides a green, practical, and environmentally friendly treatment method for soils contaminated with high concentrations of heavy metals.
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