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    Power effect of ultrasonically vibrated spacers in air gap membrane distillation: Theoretical and experimental investigations

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    Name:
    power effect of...Ultrasonic vibrated spacer in MD Seppur 2021 online version (1).pdf
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    983.3Kb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2023-01-18
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    Type
    Article
    Authors
    Al-juboori, Raed A.
    Naji, Osamah
    Bowtell, Les
    Alpatova, Alla
    Soukane, Sofiane
    Ghaffour, NorEddine cc
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Environmental Science and Engineering Program
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2021-01-18
    Embargo End Date
    2023-01-18
    Submitted Date
    2020-07-01
    Permanent link to this record
    http://hdl.handle.net/10754/667071
    
    Metadata
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    Abstract
    This study investigates the efficiency of low-power ultrasound in the range of 3.5–30.0 W to improve permeate flux and alleviate membrane fouling in an air–gap membrane distillation (AGMD) system. Natural groundwater and reverse osmosis (RO) reject water were fed into the AGMD system on which fouling experiments were conducted with hydrophobic polyvinylidene fluoride (PVDF) membrane. After 35 h of AGMD system operation with groundwater and RO reject water, fouling caused the permeate flux to decrease by 30% and 40% respectively. Concentration polarization, intermediate pore blocking, and cake filtration appear to be the main reasons for flux decline with both feedwater types. Ultrasound application for a short period of 15 min resulted in flux improvement by as high as 400% and 250% for RO reject and groundwater, respectively. Modelling of the heat and mass transfers showed that the flux increase was mainly due to membrane permeability improvements under ultrasonic vibration. Fouling visualisation using Scanning Electron Microscopy revealed that ultrasound effectively removed membrane fouling without compromising the membrane's structure. Importantly, permeate flux improvements with targeted low-power ultrasound appears to be proportionally higher than those of high-power ultrasound applied to the whole system, on a flux improvement per ultrasound W/m2 basis.
    Citation
    Al-juboori Raed A., Naji, O., Bowtell, L., Alpatova, A., Soukane, S., & Ghaffour, N. (2021). Power effect of ultrasonically vibrated spacers in air gap membrane distillation: Theoretical and experimental investigations. Separation and Purification Technology, 262, 118319. doi:10.1016/j.seppur.2021.118319
    Sponsors
    The authors would like to acknowledge the financial support received from the University of Southern Queensland and the technical discussion with filtration professionals from FILPURE water filtration systems, Australia.
    Publisher
    Elsevier BV
    Journal
    Separation and Purification Technology
    DOI
    10.1016/j.seppur.2021.118319
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1383586621000216
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.seppur.2021.118319
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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