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    An in-situ technique for the direct structural characterization of biofouling in membrane filtration

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    Name:
    Direct structural charact of biofouling JMS 2.pdf
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    1.209Mb
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    PDF
    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    Kerdi, Sarah
    Qamar, Adnan
    Alpatova, Alla
    Ghaffour, NorEddine cc
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Date
    2019-04-22
    Online Publication Date
    2019-04-22
    Print Publication Date
    2019-08
    Permanent link to this record
    http://hdl.handle.net/10754/631997
    
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    Abstract
    In the present work, a convenient and direct technique which enables to characterize the intrinsic structure and the mechanical properties of the biofilm without altering its chemical and physical properties is proposed. By utilizing the Optical Coherence Tomography (OCT) as a structural imaging tool coupled with an advance mathematical framework, thickness, micro-porosity, normal stress-strain curve, bulk modulus and total permeability of the biofilm structures are determined. The accuracy of this mathematical technique for the in situ characterization is validated by analyzing two different membrane structures for porosity and permeability values against the mercury intrusion porosimetry method. Three-dimensional images of biofouling were obtained with high resolution aided to numerically analyze the intrinsic biofilm structure at microscale. Growth of biofilm in a dead-end filtration experimental setup was investigated by varying the feed flow rate which allowed uniform compression and decompression to compute normal stress-strain relation of the evolving biofilm structure. At early development of biofilm (day 3), the thickness and normal stress/strain curve showed that the biofilm structure behave similar to elastic material. However, hysteresis-like trend starts to appear with the growth of biofilm suggesting the deviation of biofilm properties to viscoelastic nature at day 8. The microstructure porosity increased from 0.214 (day 3) to 0.482 (day 8) at a feed flow rate of 15 mL/min. The total membrane/biofilm permeability decreased with biofilm age to reach 5.19 × 10−15 m2 at day 8 at the same flow rate, leading to a reduction of permeate flux over time. All the structural properties were found to be time dependent as the biofilm continuously evolved.
    Citation
    Kerdi S, Qamar A, Alpatova A, Ghaffour N (2019) An in-situ technique for the direct structural characterization of biofouling in membrane filtration. Journal of Membrane Science. Available: http://dx.doi.org/10.1016/j.memsci.2019.04.051.
    Sponsors
    The research reported in this paper was supported by King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The authors acknowledge help, assistance and support from the Water Desalination and Reuse Center (WDRC) staff.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2019.04.051
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0376738819304521
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2019.04.051
    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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