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    Quantitative measurement and visualization of biofilm O 2 consumption rates in membrane filtration systems

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    Type
    Article
    Authors
    Prest, Emmanuelle I E C
    Staal, Marc J.
    Kühl, Michael
    van Loosdrecht, Mark C.M. cc
    Vrouwenvelder, Johannes S. cc
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Environmental Science and Engineering Program
    Date
    2012-03
    Permanent link to this record
    http://hdl.handle.net/10754/562106
    
    Metadata
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    Abstract
    There is a strong need for techniques enabling direct assessment of biological activity of biofouling in membrane filtration systems. Here we present a new quantitative and non-destructive method for mapping O 2 dynamics in biofilms during biofouling studies in membrane fouling simulators (MFS). Transparent planar O 2 optodes in combination with a luminescence lifetime imaging system were used to map the two-dimensional distribution of O 2 concentrations and consumption rates inside the MFS. The O 2 distribution was indicative for biofilm development. Biofilm activity was characterized by imaging of O 2 consumption rates, where low and high activity areas could be clearly distinguished. The spatial development of O 2 consumption rates, flow channels and stagnant areas could be determined. This can be used for studies on concentration polarization, i.e. salt accumulation at the membrane surface resulting in increased salt passage and reduced water flux. The new optode-based O 2 imaging technique applied to MFS allows non-destructive and spatially resolved quantitative biological activity measurements (BAM) for on-site biofouling diagnosis and laboratory studies. The following set of complementary tools is now available to study development and control of biofouling in membrane systems: (i) MFS, (ii) sensitive pressure drop measurement, (iii) magnetic resonance imaging, (iv) numerical modelling, and (v) biological activity measurement based on O 2 imaging methodology. © 2011 Elsevier B.V.
    Citation
    Prest, E. I., Staal, M., Kühl, M., van Loosdrecht, M. C. M., & Vrouwenvelder, J. S. (2012). Quantitative measurement and visualization of biofilm O2 consumption rates in membrane filtration systems. Journal of Membrane Science, 392-393, 66–75. doi:10.1016/j.memsci.2011.12.003
    Sponsors
    This work was performed by Wetsus, centre of excellence for sustainable water technology, Delft University of Technology and the Marine Biological Laboratory, University of Copenhagen. Wetsus is funded by the Ministry of Economic Affairs. Additional support was due to grants from the Danish Natural Science Research Council (M. S., M. K.). The authors thank the participants of the Wetsus theme 'Biofouling' for the fruitful discussions and their financial support.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2011.12.003
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2011.12.003
    Scopus Count
    Collections
    Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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