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  • Combined zero valent iron and hydrogen peroxide conditioning significantly enhances the dewaterability of anaerobic digestate

    Author(s)
    Wang, Qilin
    Sun, Jing
    Song, Kang
    Zhou, Xu
    Wei, Wei
    Wang, Dongbo
    Xie, Guo-Jun
    Gong, Yanyan
    Zhou, Beibei
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2017
    Metadata
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    Abstract
    The importance of enhancing sludge dewaterability is increasing due to the considerable impact of excess sludge volume on disposal costs and on overall sludge management. This study presents an innovative approach to enhance dewaterability of anaerobic digestate (AD) harvested from a wastewater treatment plant. The combination of zero valent iron (ZVI, 0–4.0 g/g total solids (TS)) and hydrogen peroxide (HP, 0–90 mg/g TS) under pH 3.0 significantly enhanced the AD dewaterability. The largest enhancement of AD dewaterability was achieved at 18 mg HP/g TS and 2.0 g ZVI/g TS, with the capillary suction time reduced by up to 90%. ...
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    The importance of enhancing sludge dewaterability is increasing due to the considerable impact of excess sludge volume on disposal costs and on overall sludge management. This study presents an innovative approach to enhance dewaterability of anaerobic digestate (AD) harvested from a wastewater treatment plant. The combination of zero valent iron (ZVI, 0–4.0 g/g total solids (TS)) and hydrogen peroxide (HP, 0–90 mg/g TS) under pH 3.0 significantly enhanced the AD dewaterability. The largest enhancement of AD dewaterability was achieved at 18 mg HP/g TS and 2.0 g ZVI/g TS, with the capillary suction time reduced by up to 90%. Economic analysis suggested that the proposed HP and ZVI treatment has more economic benefits in comparison with the classical Fenton reaction process. The destruction of extracellular polymeric substances and cells as well as the decrease of particle size were supposed to contribute to the enhanced AD dewaterability by HP + ZVI conditioning.
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    Journal Title
    Journal of Environmental Sciences
    Volume
    67
    DOI
    https://doi.org/10.1016/j.jes.2017.04.004
    Subject
    Environmental Technologies
    Chemical Sciences
    Earth Sciences
    Environmental Sciences
    Science & Technology
    Life Sciences & Biomedicine
    Anaerobic digestate
    Ecology
    Publication URI
    http://hdl.handle.net/10072/400743
    Collection
    • Journal articles

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