固定化微生物技术修复镉污染红黏土的室内试验研究

陈筠; 黄洋; 向川; 龙钰

doi:10.11988/ckyyb.20230042

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长江科学院院报 ›› 2024, Vol. 41 ›› Issue (6) : 106-113. DOI: 10.11988/ckyyb.20230042

岩土工程

固定化微生物技术修复镉污染红黏土的室内试验研究

陈筠¹, 黄洋², 向川³, 龙钰⁴

作者信息 +

Indoor Experimental Study on Remediation of Cadmium- Contaminated Red Clay by Immobilized Microbial Technology

CHEN Jun¹, HUANG Yang² , XIANG Chuan³ , LONG Yu⁴

Author information +

文章历史 +

摘要

为了探究固定化微生物技术对镉(Cd)污染红黏土物理力学性质和环境污染的修复效应,以活性炭为载体,菌种选取巴氏芽孢杆菌,开展基本物理试验、无侧限抗压强度试验、毒性浸出试验和重金属形态提取试验。试验结果表明:巴氏芽孢杆菌对镉离子有较强的耐受性;对比单加微生物或活性炭,固定化微生物技术的修复效果更显著;14%活性炭微生物土样的无侧限抗压强度为229.7 kPa,较镉污染土提升174.7%;修复21 d后,10%活性炭微生物土样的镉离子浸出浓度降低到0.002 mg/L,较镉污染土样降低99.8%;修复后,土中的镉从弱酸态向可还原态和残渣态转化。总的来说,固定化微生物技术对镉污染红黏土具有良好的修复效果,活性炭的掺量以10%为宜。研究成果可为贵州省镉污染红黏土的治理提供参考。

Abstract

To investigate the efficacy of immobilized microorganism technology in remediating cadmium (Cd) contamination in red clay and its impact on environmental pollution, we conducted a series of basic physical tests, unconfined compressive strength tests, toxic leaching tests, and heavy metal extraction tests. Activated carbon served as the carrier with Bacillus pasteuri as the strain. Results revealed Bacillus pasteuri’s robust cadmium ion tolerance. Compared to either microorganism or activated carbon alone, immobilized microorganism exhibited superior remediation efficacy. Unconfined compressive strength of soil containing 14% activated carbon and microorganisms reached 229.7 kPa, a 174.4% increase over cadmium-contaminated soil. Within 21 days, cadmium leaching concentration in soil containing 10% activated carbon and microorganisms decreased to 0.002 mg/L, down by 99.8% compared to Cd-contaminated soil samples. After remediation, cadmium in soil transitioned from a weak acid state to reducible and residual states. In summary, immobilized microorganism technology demonstrates effective remediation of cadmium-contaminated red clay, particularly at a 10% activated carbon concentration. These findings offer valuable insights for addressing cadmium pollution in red clay in Guizhou Province.

导出引用

陈筠, 黄洋, 向川, 龙钰. 固定化微生物技术修复镉污染红黏土的室内试验研究[J]. 长江科学院院报. 2024, 41(6): 106-113 https://doi.org/10.11988/ckyyb.20230042

CHEN Jun, HUANG Yang , XIANG Chuan , LONG Yu. Indoor Experimental Study on Remediation of Cadmium- Contaminated Red Clay by Immobilized Microbial Technology[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(6): 106-113 https://doi.org/10.11988/ckyyb.20230042

中图分类号： TU446 X53

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