Kinetics of Ferrous Iron Oxidation by Leptospirillum Ferriphilum at Moderate to High Total Iron Concentrations

Abstract:

The effects of temperature, pH and iron concentration on the kinetics of ferrous iron biooxidation by a free suspended culture of Leptospirillum ferriphilum were studied in shake flasks and a circulating bed bioreactor at moderate to high total iron concentration. The kinetic study showed that there are two distinct modes of iron biooxidation: growth associated and non-growth associated, depending on the pH of the medium. There were also distinctive maxima of the effect of temperature and pH on the rate of biooxidation. A kinetic model of the process was proposed, based on an electrochemical-enzymatic model. The proposed model indicates that at moderate to high concentrations (above ~12 g/L), the total iron concentration becomes the single most prominent inhibiting factor.

• Periodical: Advanced Materials Research (Volumes 71-73)
• Pages: 255-258
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.71-73.255
• Online since: May 2009
• Authors: K. Penev, D. Karamanev
• Keywords: Ferrous Iron Oxidation, Kinetic Study, Leptospirillum ferriphilum, Suspended Cell

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