干湿交替和冻融循环促进风化煤固定化微生物材料钝化铅的稳定性

庞黛; 李小针; 孙艳稳; 李林; 焦子乐; 李建华

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2681-2692.

土壤污染与控制

干湿交替和冻融循环促进风化煤固定化微生物材料钝化铅的稳定性

庞黛^1,2, 李小针^1,2, 孙艳稳^1,2, 李林^1,2, 焦子乐², 李建华^1,2

作者信息 +

Dry-rewetting and freeze-thaw cycles enhance the stability of lead passivation by microbes immobilized in weathered coal

PANG Dai^1,2, LI Xiao-zhen^1,2, SUN Yan-wen^1,2, LI Lin^1,2, JIAO Zi-le², LI Jian-hua^1,2

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文章历史 +

摘要

通过室内模拟试验,分析了干湿交替和冻融循环对土壤中DTPA可提取态Pb (II)含量、Pb形态及材料结构的影响,旨在探究这两种环境因素对风化煤固定化微生物材料修复铅污染土壤效果的稳定性及机制.结果显示:干湿交替35个周期后低浓度铅污染土壤(LS-DW)和高浓度铅污染土壤(HS-DW)中DTPA可提取态Pb (II)含量分别降低46.41%和29.42%;冻融循环35个周期后低浓度铅污染土壤(LS-FT)和高浓度铅污染土壤(HS-FT)中DTPA可提取态Pb (II)含量分别降低40.06%和32.77%;LS-DW、LS-FT处理的残渣态含量增加.结构表征发现,风化煤固定化微生物材料经干湿交替、冻融循环后,表面变粗糙,比表面积、含氧官能团和Pb吸附点位增加,与官能团的络合作用增强,促进了钝化铅污染效果的稳定性.

Abstract

The impacts of dry-rewetting and freeze-thaw cycles on DTPA-extractable Pb(II) content and Pb speciation in soils and material structure of weathered coal-based immobilized microbial materials were investigated through a controlled simulated experiment. This study aimed to explore the mechanisms through which these two factors affect the effectiveness of leadcontaminated soil remediation using selected microbes. The results showed that after 35 dry-rewetting cycles, the DTPA-extractable Pb(II) content in low-concentration lead-contaminated soil (LS) and high-concentration lead-contaminated soil (HS) decreased by 46.41% and 29.42%, respectively, compared to the initial levels. After 35 freeze-thaw cycles, the content in LS and HS decreased by 40.06% and 32.77%, respectively. Additionally, the residual fraction of Pb in LS increased under both dry-rewetting and freeze-thaw treatments. Structural analysis revealed that the surface of weathered coal-became rougher, with increases in specific surface area, oxygen-containing functional groups, and Pb adsorption sites increased after dry-wet and freeze-thaw cycles. These changes enhanced complexation with functional groups thereby improving the stability of the passivation effect on lead contamination.

导出引用

庞黛, 李小针, 孙艳稳, 李林, 焦子乐, 李建华. 干湿交替和冻融循环促进风化煤固定化微生物材料钝化铅的稳定性[J]. 中国环境科学. 2025, 45(5): 2681-2692

PANG Dai, LI Xiao-zhen, SUN Yan-wen, LI Lin, JIAO Zi-le, LI Jian-hua. Dry-rewetting and freeze-thaw cycles enhance the stability of lead passivation by microbes immobilized in weathered coal[J]. China Environmental Science. 2025, 45(5): 2681-2692

中图分类号： X53

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