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Increasing cell concentration does not affect specific ferrous iron oxidation rate in a continuously stirred tank bioreactor

Boxall, N.J., Cheng, K.Y., du Plessis, C.A., Collinson, D., Morris, C., Streltsova, N., Seaman, B., Seaman, D., Vollert, L. and Kaksonen, A.H. (2018) Increasing cell concentration does not affect specific ferrous iron oxidation rate in a continuously stirred tank bioreactor. Hydrometallurgy, 181 . pp. 189-194.

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Link to Published Version: https://doi.org/10.1016/j.hydromet.2018.09.008
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Abstract

Microbial oxidation of ferrous to ferric iron allows efficient oxidative processing of sulfide minerals under ambient conditions. This study determined the effect of cell concentration of a mixed mesophilic microbial culture on iron oxidation rate, and evaluated if there was a cell concentration threshold that dictates a maximal volumetric iron oxidation rate. A bioreactor with feedback-loading of ferrous media was operated at 30 °C to maintain a redox potential of +480 mV vs. Ag/AgCl at pH of 1.3. A positive and linear correlation (R = 0.955) between the cell concentration (6.8 × 107–7.1 × 109 cells mL−1) and volumetric biological iron oxidation (up to 6.9 g L−1 h−1) was observed. The specific iron oxidation was not affected by cell concentration, and no biocatalytic threshold was observed. This indicated that a high cell concentration can be used to achieve a high volumetric iron oxidation rate, enabling the use of a compact reactor size.

Item Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Elsevier BV
Copyright: © 2018 Elsevier B.V.
URI: http://researchrepository.murdoch.edu.au/id/eprint/42219
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