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Sulfide-carbonate-mineralized functional bacterial consortium for cadmium removal in flue gas

Sulfide-carbonate-mineralized functional bacterial consortium was constructed for flue gas cadmium biomineralization. A membrane biofilm reactor (MBfR) using the bacterial consortium containing sulfate reducing bacteria (SRB) and denitrifying bacteria (DNB) was investigated for flue gas cadmium (Cd)...

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Published in:Chemosphere (Oxford) 2024-09, Vol.363, p.142869, Article 142869
Main Authors: Huang, Wenhao, Chen, Zhuoyao, Liu, Yunyan, Li, Dingfeng, Wei, Zaishan
Format: Article
Language:English
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Summary:Sulfide-carbonate-mineralized functional bacterial consortium was constructed for flue gas cadmium biomineralization. A membrane biofilm reactor (MBfR) using the bacterial consortium containing sulfate reducing bacteria (SRB) and denitrifying bacteria (DNB) was investigated for flue gas cadmium (Cd) removal. Cadmium removal efficiency achieved 90%. The bacterial consortium containing Citrobacter, Desulfocurvus and Stappia were dominated for cadmium resistance-nitrate-sulfate reduction. Under flue gas cadmium stress, ten cadmium resistance genes (czcA, czcB, czcC, czcD, cadA, cadB, cadC, cueR, copZ, zntA), and seven genes related to sulfate reduction, increased in abundance; whereas others, nine genes related to denitrification, decreased, indicating that cadmium stress was advantageous to sulfate reduction in the competition with denitrification. A bacterial consortium could capable of simultaneously cadmium resistance, sulfate reduction and denitrification. Microbial induced carbonate precipitation (MICP) and biological adsorption process would gradually yield to sulfide-mineralized process. Flue gas cadmium could transform to Cd-EPS, cadmium carbonate (CdCO3) and cadmium sulfide (CdS) bioprecipitate. The functional bacterial consortium was an efficient and eco-friendly bifunctional bacterial consortium for sulfide-carbonate-mineralized of cadmium. This provides a green and low-carbon advanced treatment technology using sulfide-carbonate-mineralized functional bacterial consortium for the removal of cadmium or other hazardous heavy metal contaminants in flue gas. [Display omitted] •Sulfide-carbonate-mineralized functional bacterial consortium for cadmium biomineralization.•Cadmium stress was advantageous to sulfate reduction in the competition with denitrification.•MICP and biosorption process would gradually yield to sulfide-mineralized process.•Flue gas cadmium was biostabilized as CdCO3 and CdS.
ISSN:0045-6535
1879-1298
1879-1298
DOI:10.1016/j.chemosphere.2024.142869