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  • Thermal-alkaline pretreatment of polyacrylamide flocculated waste activated sludge: Process optimization and effects on anaerobic digestion and polyacrylamide degradation

    Author(s)
    Liu, Xuran
    Xu, Qiuxiang
    Wang, Dongbo
    Yang, Qi
    Wu, Yanxin
    Li, Yifu
    Fu, Qizi
    Yang, Fan
    Liu, Yiwen
    Ni, Bing-Jie
    Wang, Qilin
    Li, Xiaoming
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2019
    Metadata
    Show full item record
    Abstract
    Deterioration of anaerobic digestion can occur with the presence of polyacrylamide (PAM) in waste activated sludge, and little information on mitigating this deterioration is currently available. In this study, simultaneous mitigation of PAM negative effects and improvement of methane production was accomplished by thermal-alkaline pretreatment. Under the optimized pretreatment conditions (i.e., 75 °C, pH 11.0 for 17.5 h), the biochemical methane potential of PAM-flocculated sludge increased from 100.5 to 210.8 mL/g VS and the hydrolysis rate increased from 0.122 to 0.187 d−1. Mechanism investigations revealed that the ...
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    Deterioration of anaerobic digestion can occur with the presence of polyacrylamide (PAM) in waste activated sludge, and little information on mitigating this deterioration is currently available. In this study, simultaneous mitigation of PAM negative effects and improvement of methane production was accomplished by thermal-alkaline pretreatment. Under the optimized pretreatment conditions (i.e., 75 °C, pH 11.0 for 17.5 h), the biochemical methane potential of PAM-flocculated sludge increased from 100.5 to 210.8 mL/g VS and the hydrolysis rate increased from 0.122 to 0.187 d−1. Mechanism investigations revealed that the pretreatment not only broke the large firm floccules, improved the degradation of PAM, but also facilitated the release of biodegradable organics from sludge, which thereby provided better growth environment and enough nutrients to anaerobic microbes for methane production. The activities of key enzymes responsible for methane production and PAM degradation were greatly improved in pretreated reactor, with the accumulation of acrylamide being avoided.
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    Journal Title
    BIORESOURCE TECHNOLOGY
    Volume
    281
    DOI
    https://doi.org/10.1016/j.biortech.2019.02.095
    Subject
    Bioprocessing, bioproduction and bioproducts
    Environmental engineering
    Environmental sciences
    Water treatment processes
    Water resources engineering
    Publication URI
    http://hdl.handle.net/10072/385610
    Collection
    • Journal articles

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