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Aerobic processes for bioleaching manganese and silver using microorganisms indigenous to mine tailings
- Source :
- World journal of microbiologybiotechnology. 36(8)
- Publication Year :
- 2020
-
Abstract
- Mining wastes containing appreciable concentrations of silver are considered alternative sources for metal extraction, although these wastes are often refractory due to the presence of manganese oxides. The high cost and/or environmental impact of the hydrometallurgical and pyrometallurgical extraction processes make it necessary to search for biotechnological processes for the solubilization of manganese compounds. This paper describes the characterization of chemoorganotrophic microorganisms indigenous to the tailings of a silver mine located in Coahuila, Mexico, regarding their capability to remove manganese and silver present in these residues by lixiviation. The Bacterial and fungal strains isolated were identified by sequencing the rDNA 16S and ITS-1-ITS-2 genomic regions, respectively; the bacterial strains correspond to isolates of Roseospira sp. and Sphingomonas sp., whereas the fungal strains include isolates of Cladosporium sp. A, Cladosporium sp. B and Penicillium chrysogenum. These fungal strains show an effective capacity to lixiviate manganese and silver from solid mine residue when incubated in 9 k medium; it was found that under these conditions, leaching of metals occurs due to a mixed biotic-abiotic process, which yields manganese and silver leaching efficiencies in the ranges of 58–74% and 40–67%, respectively. The fungal strains grown in the LMM medium and the bacterial strains incubated in the PDB medium caused leaching of manganese with a lower efficiency in the range of 0.17–0.24% and 1.42–1.73%, respectively; under these conditions, silver leaching by fungal and bacterial strains appeared to be reduced (
- Subjects :
- 0106 biological sciences
Silver
Physiology
Microorganism
chemistry.chemical_element
Industrial Waste
Manganese
01 natural sciences
Applied Microbiology and Biotechnology
Sphingomonas
Mining
Metal
03 medical and health sciences
010608 biotechnology
Bioleaching
Metals, Heavy
Mexico
0303 health sciences
biology
Bacteria
030306 microbiology
Chemistry
Fungi
General Medicine
Drug Tolerance
biology.organism_classification
Penicillium chrysogenum
Tailings
Environmental chemistry
visual_art
visual_art.visual_art_medium
Leaching (metallurgy)
Biotechnology
Subjects
Details
- ISSN :
- 15730972
- Volume :
- 36
- Issue :
- 8
- Database :
- OpenAIRE
- Journal :
- World journal of microbiologybiotechnology
- Accession number :
- edsair.doi.dedup.....6ec14e898cf5a6b0e0d60ccb80cf0f53