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  • Improving heavy metals removal, dewaterability and pathogen removal of waste activated sludge using enhanced chemical leaching

    Author(s)
    Zhang, Liguo
    Chen, Ying
    Ma, Caixia
    Liu, Lei
    Pan, Jingshi
    Li, Biqing
    Wu, Xuewei
    Wang, Qilin
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2020
    Metadata
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    Abstract
    In order to enhance heavy metals removal, two enhanced chemical leaching techniques were examined comparatively using NaClO and NaNO2 with the addition of FeCl3. The phosphorus release, dewaterability and pathogen removal of treated sludge were also examined after chemical leaching. The results showed that the heavy metals solubilization, improvement of dewaterability and pathogen removal were simultaneously achieved. Compared with NaClO treatment system, the better solubilization rates of Zn and Ni were observed in the NaNO2 treatment system. The improvement of Cu, Zn and Ni removal can be attributed to the disruption of ...
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    In order to enhance heavy metals removal, two enhanced chemical leaching techniques were examined comparatively using NaClO and NaNO2 with the addition of FeCl3. The phosphorus release, dewaterability and pathogen removal of treated sludge were also examined after chemical leaching. The results showed that the heavy metals solubilization, improvement of dewaterability and pathogen removal were simultaneously achieved. Compared with NaClO treatment system, the better solubilization rates of Zn and Ni were observed in the NaNO2 treatment system. The improvement of Cu, Zn and Ni removal can be attributed to the disruption of the organically bound metal fraction based on metal distribution and EEM analysis. The TP loss caused by chemical leaching in this study was in the range of 47 %–54%. The treated sludge of the two systems could both meet Class A biosolids standards (US EPA) for land application. These results provided an alternative chemical leaching method for simultaneous improvement of sludge properties.
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    Journal Title
    Journal of Cleaner Production
    Volume
    271
    DOI
    https://doi.org/10.1016/j.jclepro.2020.122512
    Subject
    Environmental Engineering
    Manufacturing Engineering
    Interdisciplinary Engineering
    Science & Technology
    Life Sciences & Biomedicine
    Green & Sustainable Science & Technology
    Publication URI
    http://hdl.handle.net/10072/400741
    Collection
    • Journal articles

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