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

YAN Bangquan; WEI Mingli; WEI Wei; SHEN Shuiyue; SONG Yaru

doi:10.3724/j.gyjzG25080103

Volume 56 Issue 7

Jul. 2026

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2026 > 56(7): 187-198

YAN Bangquan, WEI Mingli, WEI Wei, SHEN Shuiyue, SONG Yaru. Research on the Reduction Effect and Microbial Mineralization Mechanism of Cr-Contaminated Soil[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(7): 187-198. doi: 10.3724/j.gyjzG25080103

Citation:

YAN Bangquan, WEI Mingli, WEI Wei, SHEN Shuiyue, SONG Yaru. Research on the Reduction Effect and Microbial Mineralization Mechanism of Cr-Contaminated Soil[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(7): 187-198. doi: 10.3724/j.gyjzG25080103

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

doi: 10.3724/j.gyjzG25080103

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

Received Date: 2025-08-01
Available Online: 2026-08-31
Publish Date: 2026-07-20

Abstract

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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References(32)

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