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    Solubilization of excess sludge in activated sludge process using the solar photo-Fenton reaction

    Access Status
    Fulltext not available
    Authors
    Tokumura, M.
    Katoh, H.
    Katoh, T.
    Znad, Hussein
    Kawase, Y.
    Date
    2009
    Collection
    • Curtin Research Publications
    Type
    Journal Article
    Metadata
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    Abstract

    The solubilization of excess sludge by the solar photo-Fenton reaction has been investigated for the reduction of excess sludge in the activated sludge process. The solubilization kinetics depended on the dosages of the Fenton reagents, Fe and H2O2. Increases of initial Fe and H2O2 concentrations in their ranges studied in this work continuously enhanced the sludge solubilization. Cell lysis by the photo-Fenton reaction caused the increase in dissolved chemical oxygen demand (COD) in the first step of sludge solubilization. The further oxidative decomposition of the discharged organic compounds by the photo-Fenton reaction led to the decrease in the dissolved COD as the second step of sludge solubilization. The increase of dissolved COD in the first step of sludge solubilization and the consumption of H2O2 could be described by the pseudo-zero order kinetics based on the accumulated light energy. About 40% reduction of mixed-liquor suspended solids (MLSS) by the solar photo-Fenton reaction was found. It was found that solar light used as a light energy source instead of costly and hazardous artificial UV light was very effective. The dissolved COD for solar photo-Fenton reaction increased faster and by 1.5 times as compared with that by artificial UV light. © 2008 Elsevier B.V. All rights reserved.

    Citation
    Tokumura, M. and Katoh, H. and Katoh, T. and Znad, H. and Kawase, Y. 2009. Solubilization of excess sludge in activated sludge process using the solar photo-Fenton reaction. Journal of Hazardous Materials. 162 (2-3): pp. 1390-1396.
    Source Title
    Journal of Hazardous Materials
    URI
    http://hdl.handle.net/20.500.11937/11505
    DOI
    10.1016/j.jhazmat.2008.06.026
    Department
    Department of Chemical Engineering

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