Synergistic mechanisms of humic acid and biomineralization in cadmium remediation using Lysinibacillus fusiformis

Heavy metal pollution, particularly cadmium, poses severe environmental and health risks due to its high toxicity and mobility, necessitating effective remediation strategies. While both microbially induced carbonate precipitation (MICP) and humic acid adsorption are promising methods for heavy meta...

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Bibliographic Details
Published in:Environmental microbiology reports 2024-12, Vol.16 (6), p.e70037
Main Authors: Zhou, Wei, Zhu, Yaqi, Achal, Varenyam
Format: Article
Language:English
Subjects:
Adsorption
Bacillaceae - metabolism
Biodegradation, Environmental
Biomineralization
Cadmium - metabolism
Carbonates - chemistry
Carbonates - metabolism
Environmental Restoration and Remediation - methods
Humic Substances
Soil Microbiology
Soil Pollutants - chemistry
Soil Pollutants - metabolism
Urease - metabolism
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Summary:Heavy metal pollution, particularly cadmium, poses severe environmental and health risks due to its high toxicity and mobility, necessitating effective remediation strategies. While both microbially induced carbonate precipitation (MICP) and humic acid adsorption are promising methods for heavy metal mitigation, their combined effects, particularly the influence of humic acid on the MICP process, have not been thoroughly investigated. This study explores the interaction between humic acid and MICP, revealing that humic acid significantly inhibits the MICP process by reducing urease activity, with the 10% humic acid treatment resulting in a 23.8% reduction in urease activity compared to the control. Additionally, while higher concentrations of humic acid did not significantly reduce cadmium ion concentrations, they did result in a slight increase in organically bound cadmium, indicating an interaction that could alter metal speciation in the soil. These findings provide important insights into the mechanisms by which humic acid affects MICP, offering a foundation for optimizing combined remediation approaches. Future research should aim to fine-tune the balance between MICP and humic acid to enhance the overall efficiency of cadmium remediation strategies. This study contributes to the development of more effective and sustainable methods for addressing cadmium contamination.
ISSN:1758-2229
1758-2229
DOI:10.1111/1758-2229.70037