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    Impact of operation conditions, foulant adsorption, and chemical cleaning on the nanomechanical properties of ultrafiltraion hollow fiber membranes

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    Type
    Article
    Authors
    Gutierrez, Leonardo
    Keucken, Alexander
    Aubry, Cyril
    Zaouri, Noor A. cc
    Teychene, Benoit
    Croue, Jean-Philippe
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2018-04-06
    Online Publication Date
    2018-04-06
    Print Publication Date
    2018-07
    Permanent link to this record
    http://hdl.handle.net/10754/627515
    
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    Abstract
    This study analyzed the change in nanomechanical properties of ultrafiltration hollow fiber membranes harvested from pilot-scale units after twelve months of operation. Quantitative Nanomechanical Mapping technique was used to distinguish between adhesion, dissipation, deformation, and modulus while simultaneously generating a topographic image of membranes. Nanomechanical maps of virgin membranes evidenced surfaces of heterogeneous properties and were described by probability density functions. Operating conditions and feed quality exerted an impact on membranes. Clean harvested membranes showed a higher mean modulus and dissipation, and a lower deformation than virgin membranes, indicating stiffer membranes of lower elastic deformation. A significant fraction of these measurements displayed peak values deviating from the distribution; which represents regions of the membrane with properties highly differing from the probability density function. The membrane polymeric material experienced severe physicochemical changes by foulant adsorption and reaction with cleaning agents. Foulant adsorption on membranes was heterogeneous in both morphology and mechanical properties and could not be statistically described. Foulants, i.e., mainly consisting of polysaccharides and proteinaceous structures, displayed low elastic deformation and high roughness and adhesion. The presence of foulants after chemical cleaning and their high adhesion would be a direct nanoscale evidence of irreversible fouling. By the end of the operation, the Trans-Membrane Pressure experienced a 40% increase. The cleaning process was not able to fully recover the initial TMP, indicating irreversible fouling, i.e., permanent change in membrane characteristics and decrease in performance. These results suggest a link between the macroscopic properties and nanomechanical characteristics of membranes. This study advances our nanoscale understanding of the impact of fouling and operating conditions on membranes characteristics.
    Citation
    Gutierrez L, Keucken A, Aubry C, Zaouri N, Teychene B, et al. (2018) Impact of operation conditions, foulant adsorption, and chemical cleaning on the nanomechanical properties of ultrafiltration hollow fiber membranes. Colloids and Surfaces A: Physicochemical and Engineering Aspects 549: 34–42. Available: http://dx.doi.org/10.1016/j.colsurfa.2018.04.003.
    Sponsors
    The financial support of the GenoMembran-project funded by The Swedish Water and Wastewater Association (Swedish Water Development, SVU), Norrvatten, and VIVAB is gratefully acknowledged. Pentair X-Flow is acknowledged for the provision of various test modules and general membrane investigations.
    Publisher
    Elsevier BV
    Journal
    Colloids and Surfaces A: Physicochemical and Engineering Aspects
    DOI
    10.1016/j.colsurfa.2018.04.003
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0927775718302735
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.colsurfa.2018.04.003
    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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