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    Effect of alkali addition on sulfur transformation during low temperature pyrolysis of sewage sludge

    Access Status
    Fulltext not available
    Authors
    Cheng, S.
    Qiao, Y.
    Huang, J.
    Cao, L.
    Yang, H.
    Liu, H.
    Yu, Yun
    Xu, M.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Cheng, S. and Qiao, Y. and Huang, J. and Cao, L. and Yang, H. and Liu, H. and Yu, Y. et al. 2015. Effect of alkali addition on sulfur transformation during low temperature pyrolysis of sewage sludge. Proceedings of the Combustion Institute.. 36 (2): pp. 2253-2261.
    Source Title
    Proceedings of the Combustion Institute.
    DOI
    10.1016/j.proci.2016.06.124
    ISSN
    1540-7489
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/52881
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 by The Combustion Institute. Published by Elsevier Inc.Odorous sulfur-containing gases released during sewage sludge processing cause significant environmental pollution. This study investigates the effect of alkali addition on sulfur transformation as well as the release of the sulfur-containing gases during sewage sludge pyrolysis at 150-450°C. The presence of alkali can promote the transformation of unstable organic aliphatic and aromatic sulfurs into more stable sulfoxides and sulphonic acid at low temperatures (i.e., 250°C). Alkalis also fix the inorganic sulfide and sulphate in char. Therefore, the release of the sulfur-containing gases can be greatly reduced with alkali addition. Stronger alkalis show more significant effect on the reduction of sulfur-containing gases, likely because of more OH radicals generated for the transformation of organic sulfurs.

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