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    Dewaterability of Anaerobic Digested Sludge with Cations and Chitosan as Dual Conditioners

    Access Status
    Fulltext not available
    Authors
    Lau, Shiew Wei
    Chong, Siew
    Ang, Ming
    Sen, Tushar
    Chua, Han Bing
    Date
    2013
    Type
    Book Chapter
    
    Metadata
    Show full item record
    Citation
    Lau, S.W. and Chong, S. and Ang, M. and Sen, T. and Chua, H.B. 2013. Dewaterability of Anaerobic Digested Sludge with Cations and Chitosan as Dual Conditioners. In Developments in Sustainable Chemical and Bioprocess Technology, ed. Ravindra Pogaku, Awang Bono and Christopher Chu, 11-17. United States: Springer Science+Business Media New York.
    Source Title
    Developments in Sustainable Chemical and Bioprocess Technology
    ISBN
    978-1-4614-6207-1
    School
    Curtin Sarawak
    URI
    http://hdl.handle.net/20.500.11937/49300
    Collection
    • Curtin Research Publications
    Abstract

    Anaerobic digested sludge dewatering is very important in sludge management and disposal. In this study, flocculation and dewatering behaviour of anaerobic digested sludge were investigated using metal cations (sodium, magnesium, calcium, ferric and aluminium salts) and chitosan as dual conditioners. The trivalent ferric and aluminium ions were found to be more effective than the monovalent and divalent cations in improving sludge dewaterability as measured by capillary suction time (CST). Post-addition of chitosan into the sludge precoagulated with metal cations further enhanced the sludge dewaterability. This study suggests that pre-destabilisation of sludge by coagulation with metal cations followed by chitosan addition as polymeric flocculant may improve the dewaterability of anaerobic digested sludge.

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