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    Evaluation of different cleaning strategies for different types of forward osmosis membrane fouling and scaling

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    FO cleaning JMS 2020 Online version.pdf
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    4.954Mb
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    Type
    Article
    Authors
    Kim, Youngjin cc
    Li, Sheng
    Ghaffour, NorEddine cc
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Environmental Science and Engineering Program
    Biological and Environmental Sciences and Engineering (BESE) Division
    KAUST Grant Number
    CRG2017
    Date
    2019-12-10
    Online Publication Date
    2019-12-10
    Print Publication Date
    2020-02
    Embargo End Date
    2021-12-10
    Permanent link to this record
    http://hdl.handle.net/10754/660995
    
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    Abstract
    In this study, various cleaning methods are investigated to effectively control membrane fouling (i.e., organic fouling, colloidal fouling and scaling) in forward osmosis (FO). Simple physical cleanings (i.e., hydraulic flushing and osmotic backwashing) are firstly employed to remove membrane fouling. Both methods achieved higher than 95% efficiency and osmotic backwashing has a better efficiency for organic fouling and scaling in long-term operation, but colloidal fouling was not removed. To enhance the efficiency, intense physical cleanings (i.e., air scouring and the combination of various physical cleaning) and chemical cleanings (i.e., EDTA, low pH and high pH) were conducted but could not remove the fouling layer possibly because of the polymerization of silica colloids. Lastly, four hybrid mitigation methods (i.e., low pH DS, pulsed flow, high crossflow, and periodic sparging of CO2 saturated solution) followed by hydraulic flushing were examined. The combination of CO2 saturated solution and hydraulic flushing completely removed the fouling layer because CO2 bubbles weakened the interaction between the fouling layer and the membrane surface. Periodic air scouring also exhibited similar effect on the fouling layer. Therefore, periodic air scouring can be more feasible option to control the silica colloidal fouling but not organic fouling.
    Citation
    Kim, Y., Li, S., & Ghaffour, N. (2020). Evaluation of different cleaning strategies for different types of forward osmosis membrane fouling and scaling. Journal of Membrane Science, 596, 117731. doi:10.1016/j.memsci.2019.117731
    Sponsors
    The research reported in this paper was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia, through Competitive Research Grant Program - CRG2017 (CRG6), Project # UFR/1/3404-01. Authors extend their gratitude to the Water Desalination and Reuse Center (WDRC) staff for their continuous support.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2019.117731
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0376738819327425
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2019.117731
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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