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    Predicting the impact of feed spacer modification on biofouling by hydraulic characterization and biofouling studies in membrane fouling simulators

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    Type
    Article
    Authors
    Siddiqui, Amber cc
    Lehmann, S.
    Bucs, Szilard cc
    Fresquet, M.
    Fel, L.
    Prest, E.I.E.C.
    Ogier, J.
    Schellenberg, C.
    van Loosdrecht, M.C.M.
    Kruithof, J.C.
    Vrouwenvelder, Johannes S. cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2016-12-22
    Online Publication Date
    2016-12-22
    Print Publication Date
    2017-03
    Permanent link to this record
    http://hdl.handle.net/10754/622329
    
    Metadata
    Show full item record
    Abstract
    Feed spacers are an essential part of spiral-wound reverse osmosis (RO) and nanofiltration (NF) membrane modules. Geometric modification of feed spacers is a potential option to reduce the impact of biofouling on the performance of membrane systems. The objective of this study was to evaluate the biofouling potential of two commercially available reference feed spacers and four modified feed spacers. The spacers were compared on hydraulic characterization and in biofouling studies with membrane fouling simulators (MFSs). The virgin feed spacer was characterized hydraulically by their resistance, measured in terms of feed channel pressure drop, performed by operating MFSs at varying feed water flow rates. Short-term (9 days) biofouling studies were carried out with nutrient dosage to the MFS feed water to accelerate the biofouling rate. Long-term (96 days) biofouling studies were done without nutrient dosage to the MFS feed water. Feed channel pressure drop was monitored and accumulation of active biomass was quantified by adenosine tri phosphate (ATP) determination. The six feed spacers were ranked on pressure drop (hydraulic characterization) and on biofouling impact (biofouling studies). Significantly different trends in hydraulic resistance and biofouling impact for the six feed spacers were observed. The same ranking for biofouling impact on the feed spacers was found for the (i) short-term biofouling study with nutrient dosage and the (ii) long-term biofouling study without nutrient dosage. The ranking for hydraulic resistance for six virgin feed spacers differed significantly from the ranking of the biofouling impact, indicating that hydraulic resistance of clean feed spacers does not predict the hydraulic resistance of biofouled feed spacers. Better geometric design of feed spacers can be a suitable approach to minimize impact of biofouling in spiral wound membrane systems.
    Citation
    Siddiqui A, Lehmann S, Bucs SS, Fresquet M, Fel L, et al. (2017) Predicting the impact of feed spacer modification on biofouling by hydraulic characterization and biofouling studies in membrane fouling simulators. Water Research 110: 281–287. Available: http://dx.doi.org/10.1016/j.watres.2016.12.034.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Water Research
    DOI
    10.1016/j.watres.2016.12.034
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0043135416309745
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.watres.2016.12.034
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Bioscience Program; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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