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    Compaction and relaxation of biofilms

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    Type
    Article
    Authors
    Valladares Linares, Rodrigo cc
    Wexler, A. D.
    Bucs, Szilard cc
    Dreszer, C.
    Zwijnenburg, A.
    Flemming, H. C.
    Kruithof, J. C.
    Vrouwenvelder, Johannes S. cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2015-06-18
    Online Publication Date
    2015-06-18
    Print Publication Date
    2016-06-14
    Permanent link to this record
    http://hdl.handle.net/10754/594186
    
    Metadata
    Show full item record
    Abstract
    Operation of membrane systems for water treatment can be seriously hampered by biofouling. A better characterization of biofilms in membrane systems and their impact on membrane performance may help to develop effective biofouling control strategies. The objective of this study was to determine the occurrence, extent and timescale of biofilm compaction and relaxation (decompaction), caused by permeate flux variations. The impact of permeate flux changes on biofilm thickness, structure and stiffness was investigated in situ and non-destructively with optical coherence tomography using membrane fouling monitors operated at a constant crossflow velocity of 0.1 m s−1 with permeate production. The permeate flux was varied sequentially from 20 to 60 and back to 20 L m−2 h−1. The study showed that the average biofilm thickness on the membrane decreased after elevating the permeate flux from 20 to 60 L m−2 h−1 while the biofilm thickness increased again after restoring the original flux of 20 L m−2 h−1, indicating the occurrence of biofilm compaction and relaxation. Within a few seconds after the flux change, the biofilm thickness was changed and stabilized, biofilm compaction occurred faster than the relaxation after restoring the original permeate flux. The initial biofilm parameters were not fully reinstated: the biofilm thickness was reduced by 21%, biofilm stiffness had increased and the hydraulic biofilm resistance was elevated by 16%. Biofilm thickness was related to the hydraulic biofilm resistance. Membrane performance losses are related to the biofilm thickness, density and morphology, which are influenced by (variations in) hydraulic conditions. A (temporarily) permeate flux increase caused biofilm compaction, together with membrane performance losses. The impact of biofilms on membrane performance can be influenced (increased and reduced) by operational parameters. The article shows that a (temporary) pressure increase leads to more compact biofilms with a higher hydraulic resistance. © 2015 Balaban Desalination Publications. All rights reserved.
    Citation
    Valladares Linares R, Wexler AD, Bucs SS, Dreszer C, Zwijnenburg A, et al. (2015) Compaction and relaxation of biofilms. Desalination and Water Treatment: 1–13. Available: http://dx.doi.org/10.1080/19443994.2015.1057036.
    Publisher
    Informa UK Limited
    Journal
    Desalination and Water Treatment
    DOI
    10.1080/19443994.2015.1057036
    ae974a485f413a2113503eed53cd6c53
    10.1080/19443994.2015.1057036
    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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