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    Controlling Harmful Algal Blooms (HABs) by Coagulation-Flocculation-Sedimentation using liquid ferrate and clay

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    controlling_1-s2.0-S0045653521001454-main.pdf
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    3.191Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2023-01-01
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    Type
    Article
    Authors
    Alshahri, Abdullah cc
    Fortunato, Luca 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
    2021-01
    Embargo End Date
    2023-01-01
    Submitted Date
    2020-10-15
    Permanent link to this record
    http://hdl.handle.net/10754/667077
    
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    Abstract
    Harmful algal blooms (HABs) occur worldwide and threaten the quality of marine life, public health, and membrane facilities in Seawater Reverse Osmosis (SWRO) desalination plants. The effects of HABs on seawater desalination plants include extensive membrane fouling, increased coagulant consumption and plant shutdown. To determine how to mitigate such effects, this study assessed if low doses (0.01mg/L, 0.10 mg/L, and 1.00 mg/L) of liquid ferrate (58% yield) and kaolin or montmorillonite clays alone could remove algal organic matter in coagulation-flocculation-sedimentation (CFS) pretreatment desalination systems. Results showed that 0.01mg/L of liquid ferrate coagulant removed 42% of dissolved organic carbon (DOC), 52% of biopolymers (BP), 71% of algal cells, and 99.5% of adenosine triphosphate (ATP). At a dose of 0.01mg/L, clays exhibited high removal of turbidity (up to 88%), BP (up to 80%) and algal cells (up to 67%). The combination of liquid ferrate (58% yield) as a coagulant with kaolin or montmorillonite clays as coagulant aids in CFS pretreatment led to 72% removal of DOC, 86% of BP, and 84% of algal cells with a fixed dose of 0.01 mg/L for each. Findings from this study can help SWRO plants improve the performance of pretreatment systems during algal bloom events by reducing the consumption of coagulants while also maintaining high removal efficiencies.
    Citation
    Alshahri, A. H., Fortunato, L., Ghaffour, N., & Leiknes, T. (2021). Controlling Harmful Algal Blooms (HABs) by Coagulation-Flocculation-Sedimentation using liquid ferrate and clay. Chemosphere, 129676. doi:10.1016/j.chemosphere.2021.129676
    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
    Chemosphere
    DOI
    10.1016/j.chemosphere.2021.129676
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0045653521001454
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.chemosphere.2021.129676
    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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