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    Enhanced Chemical Cleaning of Reverse Osmosis Membranes to Mitigate Biofouling

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    Name:
    Huma Sanawar Dissertation.pdf
    Size:
    3.761Mb
    Format:
    PDF
    Description:
    PhD Dissertation
    Embargo End Date:
    2021-05-01
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    Type
    Dissertation
    Authors
    Sanawar, Huma cc
    Advisors
    Vrouwenvelder, Johannes S. cc
    Committee members
    Saikaly, Pascal cc
    Jones, Burton cc
    Loosdrecht, Mark van
    Program
    Environmental Science and Engineering
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2019-10
    Embargo End Date
    2021-05-01
    Permanent link to this record
    http://hdl.handle.net/10754/660327
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation will become available to the public after the expiration of the embargo on 2021-05-01.
    Abstract
    The effectiveness of reverse osmosis (RO) membrane systems may be compromised due to fouling, of which biofouling (excessive growth of biomass) is the most troublesome. Effective control of biofouling is essential to improve membrane performance and reduce operating costs. The periodic application of chemical cleaning agents is possibly the most widely practiced method of biofouling control in RO membranes. This research investigated advanced chemical cleaning strategies for biofouling control. The first part of this study concluded that short-term accelerated biofouling studies using lab-scale membrane fouling simulators (MFSs) are a representative and suitable approach for the prediction of long-term biofouling development in membrane systems. Thereon, the superior efficiency of urea as an alternative to conventional chemical cleaning agents was demonstrated (i) at lab-scale using MFSs, (ii) for full-scale industrial spiral-wound membranes and (iii) for multiple cleaning cycles during long-term operation. Periodic chemical cleaning with urea resulted in better restoration of membrane performance, higher biomass inactivation, enhanced biofilm solubilization and removal, disintegration of extracellular polymeric substances (EPS) particularly proteins, and a considerable reduction of key biofilm-forming bacteria. This research presented enhanced chemical cleaning strategies aiming to increase the removal of biofilms, reduce biomass accumulation and its impact on membrane performance, and delay fresh biofilm formation.
    Citation
    Sanawar, H. (2019). Enhanced Chemical Cleaning of Reverse Osmosis Membranes to Mitigate Biofouling. KAUST Research Repository. https://doi.org/10.25781/KAUST-CD0W0
    DOI
    10.25781/KAUST-CD0W0
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-CD0W0
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Dissertations

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