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  • Improving dewaterability of waste activated sludge by combined conditioning with zero-valent iron and hydrogen peroxide

    Author(s)
    Zhou, Xu
    Wang, Qilin
    Jiang, Guangming
    Zhang, Xiwang
    Yuan, Zhiguo
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2014
    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 method based on combined conditioning with zero-valent iron (ZVI) and hydrogen peroxide (HP) at pH 2.0 to improve dewaterability of a full-scale waste activated sludge (WAS). The combination of ZVI (0–750 mg/L) and HP (0–750 mg/L) at pH 2.0 substantially improved the WAS dewaterability due to Fenton-like reactions. The highest improvement in WAS dewaterability was attained at 500 mg ZVI/L and 250 mg HP/L, when the capillary suction time of the WAS was reduced by approximately ...
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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 method based on combined conditioning with zero-valent iron (ZVI) and hydrogen peroxide (HP) at pH 2.0 to improve dewaterability of a full-scale waste activated sludge (WAS). The combination of ZVI (0–750 mg/L) and HP (0–750 mg/L) at pH 2.0 substantially improved the WAS dewaterability due to Fenton-like reactions. The highest improvement in WAS dewaterability was attained at 500 mg ZVI/L and 250 mg HP/L, when the capillary suction time of the WAS was reduced by approximately 50%. Particle size distribution indicated that the sludge flocs were decomposed after conditioning. Economic analysis showed that combined conditioning with ZVI and HP was a more economically favorable method for improving WAS dewaterability than the classical Fenton reaction based method initiated by ferrous salts and HP.
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    Journal Title
    Bioresource Technology
    Volume
    174
    DOI
    https://doi.org/10.1016/j.biortech.2014.10.009
    Subject
    Environmental biotechnology not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/337809
    Collection
    • Journal articles

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