Microbial remediation of cadmium-contaminated soils and its mechanisms: a review.

Wenting XU; Guoliang Chen; Zhihui QU; Bixin Liang; Teng Mao; Huan Liang; Zhang Chen; Zhixian LI

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Microbial remediation of cadmium-contaminated soils and its mechanisms: a review.

Author: Wenting XU ¹ ; Guoliang CHEN ¹ ; Zhihui QU ¹ ; Bixin LIANG ¹ ; Teng MAO ¹ ; Huan LIANG ¹ ; Zhang CHEN ¹ ; Zhixian LI ¹
Author Information

1. School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China.
Publication Type:Journal Article
Keywords: biochar; cadmium pollution; microorganisms; soil remediation
MeSH: Cadmium; Ecosystem; Soil Pollutants; Charcoal/chemistry*; Soil/chemistry*
From: Chinese Journal of Biotechnology 2023;39(7):2612-2623
CountryChina
Language:Chinese
Abstract: Excessive levels of cadmium (Cd) in soil exert serious negative impacts on soil ecosystems. Microorganisms are a common component of soil and show great potential for mitigating soil Cd. This review summarizes the application and remediation mechanisms of microorganisms, microbial-plants, and microbial-biochar in Cd-contaminated soil. Microorganisms such as Bacillus, Acinetobacter, Pseudomonas, and arbuscular mycorrhizal fungi (AMF) can change the biological validity of Cd through adsorption, mineralization, precipitation and dissolution. Different factors such as pH, temperature, biomass, concentration, and duration have significant effects on Cd bioavailability by microorganisms. Pseudomonas, Burkholderia, and Flavobacterium can promote the uptake of Cd²⁺ by hyperaccumulator through promotion and activation. Biochar, a soil amendment, possesses unique physicochemical properties and could act as a shelter for microorganisms in agriculture. The use of combined microbial-biochar can further stabilize Cd compared to using biochar alone.