Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
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Volume 44, Issue 12
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  • Using Contact Oxidation for the Treatment of Wastewater Containing Aromatic Compounds
    Akihito KUMAMI , Shojiro OSUMI, Yoshinori KANJO
    2015 Volume 44 Issue 12 Pages 667-675
    Published: December 20, 2015
    Released on J-STAGE: March 26, 2016
    DOIhttps://doi.org/10.5956/jriet.44.667
    JOURNAL FREE ACCESS
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    In order to treat wastewater containing high concentration of aromatic compounds, we evaluated the performance of the contact oxidation method by conducting a removal test with initial substrate concentration of 1,500㎎/L phenol or 1,000㎎/L cresol. The test showed that compound removal rates were three times higher than when using the conventional activated sludge method. Also, these test results suggest that contact oxidation provides higher resistance to 1,500㎎/L of the reaction inhibitor cresol. We conducted a continuous contact oxidation experiment at high load conditions for 50 days, which resulted in CODCr removal of 6.5㎏/m3/d. Genetic analysis of microorganisms in the sludge revealed a dramatic change in bacterial flora and preferential growth, particularly of Alcaligenes. The test using labeled substance 13C-phenol revealed the large contribution of Alcaligenes to be able to remove phenol.
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