Fundamental Study on the Removal of Mn<SUP>2+</SUP> in Acid Mine Drainage using Sulfate Reducing Bacteria

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  • Fundamental Study on the Removal of Mn〔2+〕 in Acid Mine Drainage using Sulfate Reducing Bacteria
  • Fundamental Study on the Removal of Mn 2 in Acid Mine Drainage using Sulfate Reducing Bacteria

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Abstract

The optimum conditions for Mn2+ removal from acid mine drainage was studied by a SRB (sulfate reducing bacteria) bioreactor. Chemical experiments with Na2S as a S2− source were conducted to investigate the effects of pH, coexisting metal ions, and the components in a growth medium for SRB on MnS formation from Mn2+ solutions. The amount of Mn removed from the Mn2+ solutions decreased with decreasing pH. The Zn2+ or Fe2+ coexisting in the solutions consumed S2− by forming ZnS or FeS, and this inhibited Mn removal. Sodium citrate, a component of the growth medium for SRB, formed a complex with Mn2+ and suppressed MnS formation. Biological experiments using the SRB reactor were carried out at 37°C and it was confirmed that the Mn2+ concentration decreased to less than 10 g·m−3 from 100 g·m−3 at neutral pHs (pH 5—7) after 100 hours when other metal ions and sodium citrate were absent. The formed precipitate was identified to be metastable γ-MnS with a band gap of about 3.8 eV by XRD, XRF, and UV-VIS.

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 45 (7), 2422-2428, 2004

    The Japan Institute of Metals and Materials

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