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  • A novel conditioning process for enhancing dewaterability of waste activated sludge by combination of zero-valent iron and persulfate

    Author(s)
    Zhou, Xu
    Wang, Qilin
    Jiang, Guangming
    Liu, Peng
    Yuan, Zhiguo
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2015
    Metadata
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    Abstract
    Improvement of sludge dewaterability is crucial for reducing the costs of sludge disposal in wastewater treatment plants. This study presents a novel conditioning method for improving waste activated sludge dewaterability by combination of persulfate and zero-valent iron. The combination of zero-valent iron (0–30 g/L) and persulfate (0–6 g/L) under neutral pH substantially enhanced the sludge dewaterability due to the advanced oxidization reactions. The highest enhancement of sludge dewaterability was achieved at 4 g persulfate/L and 15 g zero-valent iron/L, with which the capillary suction time was reduced by over 50%. The ...
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    Improvement of sludge dewaterability is crucial for reducing the costs of sludge disposal in wastewater treatment plants. This study presents a novel conditioning method for improving waste activated sludge dewaterability by combination of persulfate and zero-valent iron. The combination of zero-valent iron (0–30 g/L) and persulfate (0–6 g/L) under neutral pH substantially enhanced the sludge dewaterability due to the advanced oxidization reactions. The highest enhancement of sludge dewaterability was achieved at 4 g persulfate/L and 15 g zero-valent iron/L, with which the capillary suction time was reduced by over 50%. The release of soluble chemical oxygen demand during the conditioning process implied the decomposition of sludge structure and microorganisms, which facilitated the improvement of dewaterability due to the release of bound water that was included in sludge structure and microorganism. Economic analysis showed that the proposed conditioning process with persulfate and ZVI is more economically favorable for improving WAS dewaterability than classical Fenton reagent.
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    Journal Title
    Bioresource Technology
    Volume
    185
    DOI
    https://doi.org/10.1016/j.biortech.2015.02.088
    Subject
    Environmental biotechnology not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/337817
    Collection
    • Journal articles

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