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Effects of elevated pressures on the activity of acidophilic bioleaching microorganisms

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Effects of elevated pressures on the activity of acidophilic bioleaching microorganisms. / Hajdu-Rahkama, Réka; Ahoranta, Sarita; Lakaniemi, Aino-Maija; Puhakka, Jaakko A.

In: Biochemical Engineering Journal, Vol. 150, 107286, 15.10.2019.

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@article{2d49cb8107f842b183e4c17e8a6ac9f6,
title = "Effects of elevated pressures on the activity of acidophilic bioleaching microorganisms",
abstract = "This study reports effects of elevated pressures on the oxidation of a soluble ferrous iron and low-grade sulphidic ore as little is known about biological iron and sulphur oxidation under these conditions. Pressure effects were studied in a pressurised batch-operated stirred tank reactor using acidophilic enrichment cultures. The oxidation of soluble Fe2+ by enrichment culture dominated by Leptospirillum ferriphilum, Sulfobacillus sp. and Ferrimicrobium acidiphilum increased with increasing pressure induced by technical air to up to +3 bar (0.63 bar PO2) and was inhibited at +7 bar (1.47 bar PO2). Elevated pressures induced by nitrogen (low oxygen partial pressure) were tolerated up to +40 bar. Another enrichment culture dominated by Acidithiobacillus ferrivorans, Sulfobacillus sp. and F. acidiphilum partially oxidised the ore at pressures up to +20 bar induced with air (4.2 bar PO2). This is the first study reporting activity of acidophiles under pressurised conditions in a stirred tank reactor.",
keywords = "Acidophiles, Biooxidation, Iron oxidation, Pressure tolerance, Pressurised stirred tank reactor",
author = "R{\'e}ka Hajdu-Rahkama and Sarita Ahoranta and Aino-Maija Lakaniemi and Puhakka, {Jaakko A.}",
year = "2019",
month = "10",
day = "15",
doi = "10.1016/j.bej.2019.107286",
language = "English",
volume = "150",
journal = "Biochemical Engineering Journal",
issn = "1369-703X",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Effects of elevated pressures on the activity of acidophilic bioleaching microorganisms

AU - Hajdu-Rahkama, Réka

AU - Ahoranta, Sarita

AU - Lakaniemi, Aino-Maija

AU - Puhakka, Jaakko A.

PY - 2019/10/15

Y1 - 2019/10/15

N2 - This study reports effects of elevated pressures on the oxidation of a soluble ferrous iron and low-grade sulphidic ore as little is known about biological iron and sulphur oxidation under these conditions. Pressure effects were studied in a pressurised batch-operated stirred tank reactor using acidophilic enrichment cultures. The oxidation of soluble Fe2+ by enrichment culture dominated by Leptospirillum ferriphilum, Sulfobacillus sp. and Ferrimicrobium acidiphilum increased with increasing pressure induced by technical air to up to +3 bar (0.63 bar PO2) and was inhibited at +7 bar (1.47 bar PO2). Elevated pressures induced by nitrogen (low oxygen partial pressure) were tolerated up to +40 bar. Another enrichment culture dominated by Acidithiobacillus ferrivorans, Sulfobacillus sp. and F. acidiphilum partially oxidised the ore at pressures up to +20 bar induced with air (4.2 bar PO2). This is the first study reporting activity of acidophiles under pressurised conditions in a stirred tank reactor.

AB - This study reports effects of elevated pressures on the oxidation of a soluble ferrous iron and low-grade sulphidic ore as little is known about biological iron and sulphur oxidation under these conditions. Pressure effects were studied in a pressurised batch-operated stirred tank reactor using acidophilic enrichment cultures. The oxidation of soluble Fe2+ by enrichment culture dominated by Leptospirillum ferriphilum, Sulfobacillus sp. and Ferrimicrobium acidiphilum increased with increasing pressure induced by technical air to up to +3 bar (0.63 bar PO2) and was inhibited at +7 bar (1.47 bar PO2). Elevated pressures induced by nitrogen (low oxygen partial pressure) were tolerated up to +40 bar. Another enrichment culture dominated by Acidithiobacillus ferrivorans, Sulfobacillus sp. and F. acidiphilum partially oxidised the ore at pressures up to +20 bar induced with air (4.2 bar PO2). This is the first study reporting activity of acidophiles under pressurised conditions in a stirred tank reactor.

KW - Acidophiles

KW - Biooxidation

KW - Iron oxidation

KW - Pressure tolerance

KW - Pressurised stirred tank reactor

U2 - 10.1016/j.bej.2019.107286

DO - 10.1016/j.bej.2019.107286

M3 - Article

VL - 150

JO - Biochemical Engineering Journal

JF - Biochemical Engineering Journal

SN - 1369-703X

M1 - 107286

ER -