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    Characterisation of dissolved organic matter to optimise powdered activated carbon and clarification removal efficiency

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    Publication date
    2020
    Author
    Shutova, Y.
    Rao, N.R.H.
    Zamyadi, A.
    Baker, A.
    Bridgeman, John
    Lau, B.
    Henderson, R.K.
    Keyword
    Dissolved organic matter
    Powdered activated carbon
    DOM
    Drinking water treatment
    Coagulation-flocculation
    Rights
    (c) 2020 RSC. Full-text reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    The character of dissolved organic matter (DOM) present in drinking water treatment systems greatly impacts its treatability by coagulation–flocculation. Powdered activated carbon dosing has been suggested to enhance DOM removal when combined with coagulation–flocculation. However, optimising powdered activated carbon (PAC) dosing requires further research. In this study, fluorescence spectroscopy combined with parallel factor analysis (PARAFAC) and liquid chromatography with organic carbon detection (LC–OCD) has been used to characterise DOM removal in three ways: (a) coagulation–flocculation–sedimentation without PAC dosing, (b) PAC dosing prior to- and (c) PAC dosing during coagulation–flocculation–sedimentation treatment. It was shown that only coagulation–flocculation–sedimentation preferentially removed biopolymer and humic substance chromatographic fractions and fluorescent DOM, whereas dosing PAC preferentially removed building blocks and low molecular weight neutral chromatographic fractions. The DOM treatability that was achieved when PAC was dosed both prior to- and during coagulation–flocculation–sedimentation was comparable, but higher than what was achieved without any PAC dosing. Introduction of PAC to the coagulation–flocculation–sedimentation process significantly improved DOM removal, with fluorescent components removed by 97%. This study also highlights that a combination of fluorescence spectroscopy and LC–OCD is essential to track the removal of both, fluorescent and non-fluorescent DOM fractions and understand their impacts on DOM treatability when using different treatment processes. Overall, lower residual DOM concentrations were obtained in the treated water when PAC adsorption and the coagulation–flocculation–sedimentation processes were combined when compared to treating the water with only one of the processes, despite differences in source water character of DOM.
    URI
    http://hdl.handle.net/10454/17866
    Version
    Accepted manuscript
    Citation
    Shutova Y, Rao NRH, Zamyadi A et al (2020) Characterisation of dissolved organic matter to optimise powdered activated carbon and clarification removal efficiency. Environmental Science: Water Research and Technology. Accepted for publication.
    Link to publisher’s version
    https://doi.org/10.1039/D0EW00149J
    Type
    Article
    Collections
    Engineering and Informatics Publications

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