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• W4385612879 abstract "Within the European research project NEMO, a bioleaching strategy was developed for efficient metal extraction from bioleach residue currently heap-leached at Sotkamo (Finland) that still contains sulphidic minerals and valuable metals (Ni, Zn, Co, Cu). The strategy of gradually increasing the solid content with 5% steps allowed the adaptation of the consortium up to 20%(w/w) solid content, with efficient metal dissolution and same dominant bacteria. Largest proportions of Sb. thermosulfidooxidans while Eh increased suggested it to be most involved in iron oxidation. At. caldus was rather found when pH stabilized, in line with a production of protons from sulphur oxidation that maintained low pH. ‘Acidithiomicrobium’ P2 was favoured towards the end of the runs and at 20%(w/w) solids possibly due to its tolerance to Ni. The use of gene abundance to evaluate biomass in the pulp provided complementary results to classical cell counts in the liquid phase, and suggested a key role of bacteria associated to mineral particles in iron oxidation. Scaling-up in 21-L STR at 20%(w/w) solids had no detrimental effect on bioleaching and confirmed metal extraction rates. ‘Acidithiomicrobium’ P2 and Sb. thermosulfidooxidans remained main actors. However, the biological activity was considerably reduced at 30%(w/w) solid concentration, which may be due to a too drastic environmental change for the bacteria to adapt to higher solid concentration. Efficient bioleaching of Sotkamo bioleaching residue at high solid concentration was demonstrated, as well as the robustness of the selected moderately thermophilic consortium, at laboratory and pilot scales." @default.
• W4385612879 created "2023-08-07" @default.
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• W4385612879 date "2023-08-01" @default.
• W4385612879 modified "2023-10-17" @default.
• W4385612879 title "Bioleaching of polymetallic sulphidic mining residues: influence of increasing solid concentration on microbial community dynamics and metal dissolution" @default.
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• W4385612879 doi "https://doi.org/10.1016/j.resmic.2023.104112" @default.
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