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Model-based evaluation of ferrous iron oxidation by acidophilic bacteria in chemostat and biofilm airlift reactors

  • Biotechnology Methods
  • Published:
Journal of Industrial Microbiology & Biotechnology

Abstract

This article presents a model-based evaluation of ferrous iron oxidation in chemostat and biofilm airlift reactors inoculated with a mixed culture of Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans bacteria. The competition between the two types of bacteria in the chemostat and in the biofilm airlift reactors together with the distribution of both bacteria along the biofilm thickness at different time sections has been studied. The bacterial distribution profiles along the biofilm in the airlift reactor at different time scales show that in the beginning A. ferrooxidans bacteria are dominant, but when the reactor operates for a long time the desirable L. ferrooxidans species outcompete A. ferrooxidans as a result of the low Fe2+ and high Fe3+ concentrations. The results obtained from the simulation were compared with the experimental data of continuously operated internal loop airlift biofilm reactor. The model results are in good agreement with the experimental results.

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Authors and Affiliations

  1. Faculty of Chemical Engineering, Biotechnology Research Center, Sahand University of Technology, Tabriz, Iran

    Sirous Ebrahimi, Neda Faraghi & Maryam Hosseini

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  1. Sirous Ebrahimi
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  2. Neda Faraghi
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  3. Maryam Hosseini
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Correspondence to Sirous Ebrahimi.

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Ebrahimi, S., Faraghi, N. & Hosseini, M. Model-based evaluation of ferrous iron oxidation by acidophilic bacteria in chemostat and biofilm airlift reactors. J Ind Microbiol Biotechnol 42, 1363–1368 (2015). https://doi.org/10.1007/s10295-015-1667-9

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  • DOI: https://doi.org/10.1007/s10295-015-1667-9

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