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    Role of dissolved air flotation (DAF) and liquid ferrate on mitigation of algal organic matter (AOM) during algal bloom events in RO desalination

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    Name:
    Role of_DAF online version Seppur 2020.pdf
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    1.531Mb
    Format:
    PDF
    Description:
    Accepted Article
    Embargo End Date:
    2022-09-28
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    Type
    Article
    Authors
    Alshahri, Abdullah cc
    Fortunato, Luca cc
    Zaouri, Noor A. cc
    Ghaffour, NorEddine cc
    Leiknes, TorOve cc
    KAUST Department
    Environmental Science and Engineering Program
    Biological and Environmental Sciences and Engineering (BESE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2020-09-28
    Embargo End Date
    2022-09-28
    Submitted Date
    2020-06-05
    Permanent link to this record
    http://hdl.handle.net/10754/665513
    
    Metadata
    Show full item record
    Abstract
    Harmful Algal Blooms (HABs) are considered a major contributor to membrane biofouling in Seawater Reverse Osmosis (SWRO) desalination plants. The presence of HABs in the raw feed water leads to an increase in membrane fouling rate, increase of chemical consumption, and can cause temporary shutdown of plants. Effective pretreatment can reduce the amount of organic foulants reaching the RO membrane and alleviate the problem of flux decline during RO operation and frequent membrane cleaning using chemicals. This study compared the effect of in-situ generated liquid ferrate and ferric chloride in combination with dissolved air flotation (DAF) as a pretreatment strategy to remove algal cells and algal organic matter (AOM) during algal bloom events. Experiments were performed using a bench-scale DAF unit. HABs conditions were simulated by harvesting AOM from cultivating Chaetoceros affinis (CA) in raw seawater to a concentration of around 10 mg C/L of dissolved organic carbon (DOC). The liquid ferrate was generated in-situ by wet oxidation of ferric chloride in analkaline media. The best performance was achieved with the combined use of liquid ferrate and DAF, removing up to 100% of algal cells, 99.99% of adenosine tri-phosphate (ATP), and up to 92% of AOM.
    Citation
    Alshahri, A. H., Fortunato, L., Zaouri, N., Ghaffour, N., & Leiknes, T. (2021). Role of dissolved air flotation (DAF) and liquid ferrate on mitigation of algal organic matter (AOM) during algal bloom events in RO desalination. Separation and Purification Technology, 256, 117795. doi:10.1016/j.seppur.2020.117795
    Sponsors
    The research reported in this paper was supported by funding from King Abdullah University of Science and Technology (KAUST). The authors acknowledge help, assistance and support from the Water Desalination and Reuse Center (WDRC) staff.
    Publisher
    Elsevier BV
    Journal
    Separation and Purification Technology
    DOI
    10.1016/j.seppur.2020.117795
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1383586620322693
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.seppur.2020.117795
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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