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Contrasted microbial community colonization of a bauxite residue deposit marked by a complex geochemical context

Abstract : Bauxite residue is the alkaline byproduct generated during alumina extraction and is commonly landfilled in open-air deposits. The growth in global alumina production have raised environmental concerns about these deposits since no large-scale reuses exist to date. Microbial-driven techniques including bioremediation and critical metal bio-recovery are now considered sustainable and cost-effective methods to revalorize bauxite residues. However, the establishment of microbial communities and their active role in these strategies are still poorly understood. We thus determined the geochemical composition of different bauxite residues produced in southern France and explored the development of bacterial and fungal communities using Illumina highthroughput sequencing. Physicochemical parameters were influenced differently by the deposit age and the bauxite origin. Taxonomical analysis revealed an early-stage microbial community dominated by haloalkaliphilic microorganisms and strongly influenced by chemical gradients. Microbial richness, diversity and network complexity increased significantly with the deposit age, reaching an equilibrium community composition similar to typical soils after decades of natural weathering. Our results suggested that salinity, pH, and toxic metals affected the bacterial community structure, while fungal community composition showed no clear correlations with chemical variations.
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https://hal-cnrs.archives-ouvertes.fr/hal-03468413
Contributor : Melanie Auffan Connect in order to contact the contributor
Submitted on : Thursday, December 16, 2021 - 3:49:06 PM
Last modification on : Thursday, June 9, 2022 - 10:00:03 AM
Long-term archiving on: : Thursday, March 17, 2022 - 6:04:20 PM

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Luis Alberto Macías-Pérez, Clément Levard, Mohamed Barakat, Bernard Angeletti, Daniel Borschneck, et al.. Contrasted microbial community colonization of a bauxite residue deposit marked by a complex geochemical context. Journal of Hazardous Materials, 2022, 424, Part B, pp.127470. ⟨10.1016/j.jhazmat.2021.127470⟩. ⟨hal-03468413⟩

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