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    Vacuum membrane distillation of liquid desiccants Utilizing Hollow Fiber Membranes

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    Type
    Article
    Authors
    Lefers, Ryan cc
    Srivatsa Bettahalli, N.M.
    Fedoroff, Nina V. cc
    Nunes, Suzana Pereira cc
    Leiknes, TorOve cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Science and Engineering (BESE) Division
    Bioscience Program
    Center for Desert Agriculture
    Emeritus Distinguished Professor of Biosciences, KAUST, Thuwal, 23955-6900, Saudi Arabia
    Environmental Science and Engineering Program
    Nanostructured Polymeric Membrane Lab
    Physical Science and Engineering (PSE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2018-01-31
    Online Publication Date
    2018-01-31
    Print Publication Date
    2018-06
    Permanent link to this record
    http://hdl.handle.net/10754/627020
    
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    Abstract
    This paper documents the testing of a vacuum membrane distillation system intended for use with liquid desiccants. Liquid desiccants offer the possibility for low-energy, ambient temperature dehumidification. Effective desalination and purification of diluted desiccants outputs two important products: a concentrated desiccant for reuse in dehumidification and fresh water. In this study, vacuum membrane distillation was used in the laboratory to purify diluted liquid desiccants. Calcium chloride and magnesium chloride were the desiccants selected for testing. Desiccant solutions were pumped through the lumens of poly(vinylidene fluoride) (PVDF) hollow fiber membranes at varying feed inlet temperatures, solution velocity rates and vacuum set points during membrane distillation. An average flux of 8 kg m-2 h-1 was obtained using 30 wt% magnesium chloride solution at a temperature of 50 °C while applying vacuum to achieve 25 mbar absolute pressure on the air side of the membrane. The results are promising for the development of a full-scale vacuum membrane distillation process for desiccant solution regeneration and fresh water recovery. In addition, the recovered condensate was of sufficient quality for use in agricultural irrigation or drinking water.
    Citation
    Lefers R, Srivatsa Bettahalli NM, Fedoroff N, Nunes SP, Leiknes T (2018) Vacuum membrane distillation of liquid desiccants Utilizing Hollow Fiber Membranes. Separation and Purification Technology. Available: http://dx.doi.org/10.1016/j.seppur.2018.01.042.
    Sponsors
    The research reported in this publication was sponsored by King Abdullah University of Science and Technology (KAUST). The authors thank colleagues from the Nanostructured Polymeric Membrane (NPM) group, as well as the Water Desalination and Reuse Center (WDRC), and KAUST’s Core Labs for their help on equipment and analysis.
    Publisher
    Elsevier BV
    Journal
    Separation and Purification Technology
    DOI
    10.1016/j.seppur.2018.01.042
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S1383586617330083
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.seppur.2018.01.042
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Bioscience Program; Advanced Membranes and Porous Materials Research Center; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Water Desalination and Reuse Research Center (WDRC); Center for Desert Agriculture

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