Bioaugmenting a Lab-Scale Membrane Bioreactor with 4-<i>tert</i>-butylphenol-degrading Bacterium, <i>Sphingobium fuliginis</i> OMI

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  • TAKADA KAZUKI
    Division of Sustainable Energy and Environmental Engineering, Osaka University
  • SHIBA TOSHIHIKO
    Division of Sustainable Energy and Environmental Engineering, Osaka University
  • SODA SATOSHI
    Division of Sustainable Energy and Environmental Engineering, Osaka University Department of Environmental Systems Engineering, Collage of Science and Engineering, Ritsumeikan University
  • INOUE DAISUKE
    Division of Sustainable Energy and Environmental Engineering, Osaka University
  • MIYAKE MASAKI
    R&D Center, Organo Corporation
  • EGUCHI MASAHIRO
    R&D Center, Organo Corporation
  • IKE MICHIHIKO
    Division of Sustainable Energy and Environmental Engineering, Osaka University

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Other Title
  • 4－<i>tert</i>－ブチルフェノール分解菌<i>Sphingobium fuliginis </i>OMIを用いたラボスケール膜分離活性汚泥法へのバイオオーグメンテーション
  • Bioaugmenting a Lab-Scale Membrane Bioreactor with 4-tert-butylphenol-degrading Bacterium, Sphingobium fuliginis OMI

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This study demonstrated the bioaugmentation of a lab-scale membrane bioreactor (MBR) that enhanced 4－tert－butylphenol (4－t－BP) elimination by Sphingobium fuliginis OMI, which utilizes 4－t－BP as its sole carbon source. The control MBR, without bioaugmentation, needed an acclimation period of over 1 month to eliminate 4－t－BP with the help of indigenous 4－t－BP degraders. Contrastingly, the bioaugmented MBR removed 4－t－BP from the influent (10－20 mg/L) to less than the detection limit (< 1 mg/L) within 7 days, and maintained 4－t－BP elimination until day 35. According to the real-time polymerase chain reaction quantifications of the catechol 2,3－dioxygenase genes, the bioaugmented MBR maintained larger amounts of the genes until day 17 when compared to the control MBR, which indicated the survival of strain OMI in the bioaugmented MBR during the period. These results verified that MBRs had superiority for bioaugmentation as they prevented the introduced strains from washing-out. However, more frequent membrane fouling occurred in the bioaugmented MBR, which could be induced by strain OMI. The results suggested that membrane fouling is an important factor to be addressed for successful bioaugmentation in an MBR.

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