铬污染土的还原效应与微生物矿化机制研究

严邦全; 魏明俐; 威巍; 申水玥; 宋亚儒

doi:10.3724/j.gyjzG25080103

铬污染土的还原效应与微生物矿化机制研究

doi: 10.3724/j.gyjzG25080103

严邦全¹,
魏明俐^2,3,
威巍^2, ,,
申水玥⁴,
宋亚儒⁴

1. 江苏省地质工程勘察院, 南京 211102;
2. 中国科学院武汉岩土力学研究所, 岩土力学与工程国家重点实验室, 武汉 430071;
3. 江苏中宜生态土研究院有限公司, 江苏宜兴 214200;
4. 青岛理工大学土木工程学院, 山东青岛 266520

基金项目:

江苏省自然科学基金项目（BK2023022776）。

详细信息

作者简介:
严邦全，高级工程师，主要从事岩土工程方面的研究工作，ybqgood@163.com。

通讯作者:
威巍，博士，主要从事污染泥土渣资源化利用方面的研究工作，weiwei204@mails.ucas.ac.cn。

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出版历程
- 收稿日期: 2025-08-01
- 网络出版日期: 2026-08-31
- 刊出日期: 2026-07-20

Research on the Reduction Effect and Microbial Mineralization Mechanism of Cr-Contaminated Soil

1. Geo-engineering Investigation Institute of Jiangsu Province, Nanjing 211102, China;
2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
3. Jiangsu Institute of Zoneco Co., Ltd., Yixing 214200, China;
4. School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China

摘要

摘要: 系统研究了化学还原结合微生物矿化修复Cr（Ⅵ）污染土的效果。通过改变胶结液的浓度和养护龄期，利用无侧限抗压强度测试和毒性浸出试验评价处理前后污染土样的修复效果，结合微观结构测试，从微观尺度上揭示微生物矿化修复Cr（Ⅵ）污染土的作用机理，为Cr（Ⅵ）污染土修复提供新的理论依据和参考。结果表明：化学还原结合微生物矿化技术能够有效地修复Cr（Ⅵ）污染土，固化土的无侧限抗压强度可达到0.227 MPa，降低固化土的Cr（Ⅵ）浸出浓度，Cr（Ⅵ）去除率达到96%以上；通过化学-微生物协同还原矿化技术对污染土体进行修复处理，处理后的土样pH先下降后上升，电导率呈显著上升的趋势，而尿素水解反应是引发上述参数升高的关键驱动因素；在经化学还原协同微生物矿化处理的Cr（Ⅵ）污染土中，检测到CaCO₃晶体的形成产物，X射线衍射与能谱分析证实，Cr（Ⅵ）与Cr（Ⅲ）污染物以表面吸附或晶格固溶形式存在于CaCO₃矿物相中，其中Cr（Ⅲ）主要通过同晶置换方式进入方解石晶体结构，通过共沉淀反应生成了化学组成稳定的复合物［Ca₁₀Cr₆O₂₄（CO₃）］，该物质表现出较低的离子迁移特性及生物可利用特征。
- 化学-生物联合修复 /
- 微生物矿化 /
- Cr（Ⅵ）污染土 /
- 胶结液浓度 /
- 土壤固化
Abstract: This study systematically investigated the effectiveness of chemical reduction combined with microbial mineralization in remediating Cr（Ⅵ）-contaminated soil. The remediation performance was evaluated under varying cementation solution concentrations and curing ages using unconfined compressive strength tests and toxicity leaching experiments. Microstructural analysis was employed to elucidate the remediation mechanisms at the microscale， providing new theoretical foundations for the remediation of Cr（Ⅵ）-contaminated soil. The results demonstrated that the integrated chemical-microbial reduction-mineralization technology effectively remediated Cr（Ⅵ）-contaminated soil， achieving a compressive strength of 0.227 MPa in the solidified soil and reducing the Cr（Ⅵ） leaching concentration， with a removal efficiency exceeding 96%. Post-treatment analysis revealed that soil pH presented an initial decrease followed by a rise， and electrical conductivity exhibited a marked upward trend， which were primarily driven by urea hydrolysis reactions. Carbonate crystal formation was observed in treated samples， and X-ray diffraction and energy-dispersive spectroscopy （EDS） confirmed that hexavalent and trivalent chromium contaminants were immobilized through surface adsorption or lattice solid-solution mechanisms. Notably， Cr（Ⅲ） predominantly entered the calcite crystal structure through isomorphous substitution， forming stable calcium-chromium coprecipitates （Ca₁₀Cr₆O₂₄（CO₃）） characterized by low mobility and bioavailability.
- chemical-biological remediation /
- microbial mineralization /
- Cr（Ⅵ）-contaminated soil /
- cementation solution concentration /
- soil solidification

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