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Related Experiment Videos

Fast kinetics of fe oxidation in packed-bed reactors.

S I Grishin1, O H Tuovinen

  • 1Department of Microbiology, The Ohio State University, Columbus, Ohio 43210.

Applied and Environmental Microbiology
|December 1, 1988
PubMed
Summary

Activated carbon in fixed-film bioreactors effectively oxidized ferrous sulfate to ferric sulfate. This method optimized biomass holdup and kinetics for efficient iron oxidation.

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Microbial Engineering

Background:

  • Thiobacillus ferrooxidans is crucial for oxidizing ferrous iron to ferric iron.
  • Fixed-film bioreactors offer potential for efficient microbial processes.
  • Support matrix selection impacts bioreactor performance.

Purpose of the Study:

  • To evaluate different support matrix materials for Thiobacillus ferrooxidans in fixed-film bioreactors.
  • To optimize ferrous sulfate oxidation efficiency.
  • To determine the best bioreactor configuration for iron oxidation.

Main Methods:

  • Testing glass beads, ion-exchange resin, and activated carbon as support matrices.
  • Operating packed-bed and fluidized-bed bioreactors.
  • Controlling pH between 1.35 and 1.5 to minimize ferric iron precipitation.

Main Results:

  • Activated carbon demonstrated superior suitability for Thiobacillus ferrooxidans biofilm formation.
  • The activated-carbon packed-bed bioreactor exhibited optimal biomass holdup and kinetic performance.
  • A maximum oxidation rate of 78 g Fe/L/h was achieved with the activated-carbon packed-bed bioreactor.

Conclusions:

  • Activated carbon is an effective support matrix for Thiobacillus ferrooxidans in fixed-film bioreactors.
  • Optimized pH and bioreactor design enhance ferrous sulfate oxidation efficiency.
  • The activated-carbon packed-bed bioreactor offers a highly efficient system for iron oxidation.

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