Role of indigenous microbial communities in the mobilization of potentially toxic elements and rare-earth elements from alkaline mine waste.

Autor: Cebekhulu S; Centre for Environmental Management, University of the Free State, Bloemfontein, Republic of South Africa., Gómez-Arias A; Department of Chemistry, University of the Free State, Bloemfontein, Republic of South Africa., Matu A; Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, Republic of South Africa., Alom J; Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, Republic of South Africa., Valverde A; Instituto de Recursos Naturales y Agrobiologıa de Salamanca (IRNASA, CSIC), Salamanca, Spain., Caraballo MA; Department of Mining, Mechanic, Energetic and Construction Engineering, Higher Technical School of Engineering, University of Huelva, Huelva, Spain; Department of Water, Mining and Environment, Scientific and Technological Center of Huelva, University of Huelva, Huelva, Spain., Ololade O; Centre for Environmental Management, University of the Free State, Bloemfontein, Republic of South Africa., Schneider P; Department for Water, Environment, Civil Engineering and Safety, University of Applied Sciences Magdeburg-Stendal, Magdeburg, Germany., Castillo J; Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, Republic of South Africa. Electronic address: CastilloHernandezJ@ufs.ac.za.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2024 Mar 15; Vol. 466, pp. 133504. Date of Electronic Publication: 2024 Jan 11.
DOI: 10.1016/j.jhazmat.2024.133504
Abstrakt: This study aims to evaluate the role of indigenous microorganisms in the mobilization of potentially toxic elements (PTE) and rare-earth elements (REE), the influence of the bioavailability of carbon sources that might boost microbial leaching, and the generation of neutral/alkaline mine drainage from alkaline tailings. These tailings, with significant concentrations of total organic carbon (TOC), were mainly colonized by bacteria belonging to the genera Sphingomonas, Novosphingobium and Solirubrobacter, and fungi of the genera Alternaria, Sarocladium and Aspergillus. Functionality analysis suggests the capability of these microorganisms to leach PTE and REE. Bio-/leaching tests confirmed the generation of neutral mine drainage, the influence of organic substrate, and the leaching of higher concentrations of PTE and REE due to the production of organic acids and siderophores by indigenous microorganisms. In addition, this study offers some insights into a sustainable alternative for reprocessing PMC alkaline tailings to recover REE.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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