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

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The optimum conditions for Mn<SUP>2+</SUP> removal from acid mine drainage was studied by a SRB (sulfate reducing bacteria) bioreactor. Chemical experiments with Na<SUB>2</SUB>S as a S<SUP>2−</SUP> 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 Mn<SUP>2+</SUP> solutions. The amount of Mn removed from the Mn<SUP>2+</SUP> solutions decreased with decreasing pH. The Zn<SUP>2+</SUP> or Fe<SUP>2+</SUP> coexisting in the solutions consumed S<SUP>2−</SUP> by forming ZnS or FeS, and this inhibited Mn removal. Sodium citrate, a component of the growth medium for SRB, formed a complex with Mn<SUP>2+</SUP> and suppressed MnS formation. Biological experiments using the SRB reactor were carried out at 37°C and it was confirmed that the Mn<SUP>2+</SUP> concentration decreased to less than 10 g·m<SUP>−3</SUP> from 100 g·m<SUP>−3</SUP> 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.

収録刊行物

  • Materials transactions

    Materials transactions 45(7), 2422-2428, 2004-07-20

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10013337809
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    7016260
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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