Acceleration of Removal of High Concentration-phenol by Activated Sludge with Nitrate－Oxidized Lignite

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  • OHTSUKI TAKASHI
    Department of Biotechnology, Faculty of Life and Environmental Sciences, University of Yamanashi
  • HANAGATA MAMI
    Department of Biotechnology, Faculty of Life and Environmental Sciences, University of Yamanashi
  • MASUDA TAKAHITO
    Denki Kagaku Kogyo Co.Ltd.
  • UI SADAHARU
    Department of Biotechnology, Faculty of Life and Environmental Sciences, University of Yamanashi

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  • 硝酸酸化亜炭添加による活性汚泥高濃度フェノール除去能の促進

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Abstract

In industrial contaminants, phenol is one of highly toxic substances in water treatment processes. As activated sludge (AS) is popular process for wastewater treatment, we succeeded to establish AS acclimated to high concentration (1.5 g/l) of phenol. In addition, we found that a nitrate－oxidized lignite (NOL) had a positive effect on acceleration of removal of phenol by AS. In tested NOLs, we selected NOL4 (0.4 of mixture ratio of nitrate to lignite) as the highest acceleration effector for phenol removal with the smallest amount of nitrate required in its production process. A series of culture profiling, floc size analysis, scanning electron microscopy observation, microbial community analyses with PCR－DGGE and clone sequencing suggested that NOL4 had a protective effect on microbial cells in AS and did not affect member constitution in microbial community. Furthermore, phenol degradation ability of the phenol-assimilating isolate HM2 was activated by addition of NOL4.

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