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    Membrane backwash cleaning using CO2 nucleation

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    Name:
    CO2 BW cleaning in UF WR 2019 online version.pdf
    Size:
    2.965Mb
    Format:
    PDF
    Description:
    Accepted Manuscript
    Embargo End Date:
    2021-08-13
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    Type
    Article
    Authors
    Al Ghamdi, Mohanned cc
    Alhadidi, Abdulsalam
    Ghaffour, NorEddine cc
    KAUST Department
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2019-08-13
    Online Publication Date
    2019-08-13
    Print Publication Date
    2019-08
    Embargo End Date
    2021-08-13
    Permanent link to this record
    http://hdl.handle.net/10754/656549
    
    Metadata
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    Abstract
    Low pressure membranes, such as ultrafiltration (UF), are widely used in water treatment applications, including the pretreatment of reverse osmosis desalination. UF membranes produce a water of superior quality, in addition to reducing the footprint and the use of chemicals, compared to conventional methods. However, membrane fouling remains a major drawback, and frequent membrane cleanings are required to maintain the flux of water and its quality. Typically, after a series of backwashes using an UF permeate, a chemical cleaning process is applied to fully recover the membrane's permeability. However, frequent chemical cleanings negatively affect the lifetime of the membrane, the environment, and increase operational costs. Here, we introduce a novel cleaning method that uses a solution saturated with CO2 to clean the membranes through the backwash step. As the pressure drops, the CO2 solution becomes supersaturated, and bubbles start to nucleate within the membrane pores and on its surface, resulting in the effective removal of the deposited fouling material. These foulants are further helping the nucleation process as they are considered as imperfection sites with high creation and growth of bubbles. Investigations performed for different synthetic feed solutions of organic compounds (sodium alginate), colloidal matter (silica) and sea salts, at different concentrations, show that our new physical cleaning process using CO2 is more performant than the regular backwash using Milli-Q water. We obtain a 100% flux recovery, in a short time, even under severe irreversible fouling conditions. Based on these results, we conclude that replacing water by a solution saturated with CO2 for the backwash cleaning of filtration membranes provides significant benefits to existing cleaning processes, and represent a promising alternative for improving and lowering the frequency of conventional chemical cleaning methods.
    Citation
    Al-Ghamdi, M. A., Alhadidi, A., & Ghaffour, N. (2019). Membrane backwash cleaning using CO2 nucleation. Water Research, 114985. doi:10.1016/j.watres.2019.114985
    Sponsors
    The research reported in this paper was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia. Authors extend their gratitude to the Water Desalination and Reuse Center (WDRC) lab staff for their support. The authors would also like to thank Xavier Pita, Scientific illustrator at KAUST, for creating Fig. 7.
    Publisher
    Elsevier BV
    Journal
    Water Research
    DOI
    10.1016/j.watres.2019.114985
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0043135419307596
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.watres.2019.114985
    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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