Abstract
The effect of high ferric sulfate concentrations on the organisms predominating in biohydrometallurgical processes (bacteria of genus Sulfobaсillus and archaea of the genus Acidiplasma) was studied. Ability of the studied strains to grow and oxidize ferrous iron in the media with 125 to 500 mM ferric sulfate was determined. High concentrations of ferric sulfate significantly inhibited the oxidative activity and growth of the studied microorganisms. Bacteria of the genus Sulfobaсillus were found to be incapable of active iron oxidation in the presence of ferric iron sulfate at concentrations exceeding 250 mM. Archaea of the genus Acidiplasma oxidized ferrous iron completely in the presence of 500 mM Fe3+. Microbial growth was suppressed by relatively low ferric sulfate concentrations. Almost no growth occurred at ferric sulfate concentrations exceeding 199 mM, while lysis of the cells of all studied strains was observed at higher Fe3+ concentrations. Archaea (genus Acidiplasma, family Ferroplasmaceae) were shown to be more tolerant to high ferric sulfate concentrations than bacteria of the genus Sulfobaсillus. The results obtained may be used for improvement of biohydrometallurgical technologies and are also important for the understanding of the patterns of formation of microbial communities carrying out the technological processes.
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Original Russian Text © A.G. Bulaev, 2017, published in Mikrobiologiya, 2017, Vol. 86, No. 4, pp. 455–462.
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Bulaev, A.G. Effect of ferric sulfate on activity of moderately thermophilic acidophilic iron-oxidizing microorganisms. Microbiology 86, 469–475 (2017). https://doi.org/10.1134/S002626171704004X
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DOI: https://doi.org/10.1134/S002626171704004X