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    NOM and TEP fouling of a forward osmosis (FO) membrane: Foulant identification and cleaning

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    Type
    Article
    Authors
    Valladares Linares, Rodrigo cc
    Yangali-Quintanilla, Victor
    Li, Zhenyu
    Amy, Gary L.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2012-12
    Permanent link to this record
    http://hdl.handle.net/10754/562432
    
    Metadata
    Show full item record
    Abstract
    The study of forward osmosis (FO) membranes has increased due to the already demonstrated advantages compared to high-energy membrane processes such as reverse osmosis (RO). This research focuses on characterization of the natural organic matter (NOM) fraction causing fouling on the active layer (AL) of a FO membrane in a novel plate and frame module configuration, facing secondary wastewater effluent as a feed solution (FS) and seawater used as a draw solution (DS). In addition, transparent exopolymer particles (TEP) were observed on the support layer (SL) of the membrane in contact with the DS. The NOM fouling layer, after characterizing the water samples and membranes used, was found to be composed of biopolymers and protein-like substances, which adversely affect the flux of water through the FO membrane. However, NOM fouling showed high reversibility, up to 90% when air scouring for 15. min is used as a cleaning technique. The irreversible fouling in this work was found to be 8.2% after chemical cleaning. On the support layer of the membrane, TEP formed clusters clearly identifiable with an optical microscope and a TEP-specific dye. Chemical cleaning with 1% NaOCl for 10. min proved to be the most effective method to remove TEP. © 2012.
    Citation
    Valladares Linares, R., Yangali-Quintanilla, V., Li, Z., & Amy, G. (2012). NOM and TEP fouling of a forward osmosis (FO) membrane: Foulant identification and cleaning. Journal of Membrane Science, 421-422, 217–224. doi:10.1016/j.memsci.2012.07.019
    Sponsors
    The authors thank Hydration Technology Innovations for providing the FO membranes. The help, assistance and support of the WDRC group is greatly appreciated, for their assistance in completing this research. GS E&C from South Korea is acknowledge for partially funding this research.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2012.07.019
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2012.07.019
    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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