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    Applicability of short-term accelerated biofouling studies to predict long-term biofouling accumulation in reverse osmosis membrane systems

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    Type
    Article
    Authors
    Sanawar, Huma
    Siddiqui, Amber cc
    Bucs, Szilard cc
    Siddiqui, Amber cc
    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
    2017
    Permanent link to this record
    http://hdl.handle.net/10754/627239
    
    Metadata
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    Abstract
    Biofouling studies addressing biofouling control are mostly executed in short-term studies. It is unclear whether data collected from these experiments are representative for long-term biofouling as occurring in full-scale membrane systems. This study investigated whether short-term biofouling studies accelerated by biodegradable nutrient dosage to feed water were predictive for long-term biofouling development without nutrient dosage. Since the presence of a feed spacer has an strong effect on the degree of biofouling, this study employed six geometrically different feed spacers. Membrane fouling simulators (MFSs) were operated with the same (i) membrane, (ii) feed flow and (iii) feed water, but with feed spacers varying in geometry. For the short-term experiment, biofilm formation was enhanced by nutrient dosage to the MFS feed water, whereas no nutrient dosage was applied in the long-term experiment. Pressure drop development was monitored to characterize the extent of biofouling, while the accumulated viable biomass content at the end of the experimental run was quantified by adenosine triphosphate (ATP) measurements. Impact of feed spacer geometry on biofouling was compared for the short-term and long-term biofouling study. The results of the study revealed that the feed spacers exhibited the same biofouling behavior for (i) the short-term (9-d) study with nutrient dosage and (ii) the long-term (96-d) study without nutrient dosage. For the six different feed spacers, the accumulated viable biomass content (pg ATP.cm) was roughly the same, but the biofouling impact in terms of pressure drop increase in time was significantly different. The biofouling impact ranking of the six feed spacers was the same for the short-term and long-term biofouling studies. Therefore, it can be concluded that short-term accelerated biofouling studies in MFSs are a representative and suitable approach for the prediction of biofouling in membrane filtration systems after long-term operation.
    Citation
    Sanawar H, Siddiqui A, Bucs SS, Farhat NM, van Loosdrecht MCM, et al. (2017) Applicability of short-term accelerated biofouling studies to predict long-term biofouling accumulation in reverse osmosis membrane systems. DESALINATION AND WATER TREATMENT 97: 72–78. Available: http://dx.doi.org/10.5004/dwt.2017.21625.
    Sponsors
    The authors would like to thank King Abdullah University of Science and Technology (KAUST) and Evides Industriewater for funding this research project.
    Publisher
    Desalination Publications
    Journal
    DESALINATION AND WATER TREATMENT
    DOI
    10.5004/dwt.2017.21625
    Additional Links
    http://www.deswater.com/DWT_abstracts/vol_97/97_2017_72.pdf
    ae974a485f413a2113503eed53cd6c53
    10.5004/dwt.2017.21625
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Bioscience Program; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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