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    Fertiliser drawn forward osmosis process: Pilot-scale desalination of mine impaired water for fertigation

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    Type
    Article
    Authors
    Phuntsho, Sherub
    Kim, Jung Eun
    Johir, Mohammad AH
    Hong, Seungkwan cc
    Li, Zhenyu
    Ghaffour, NorEddine cc
    Leiknes, TorOve cc
    Shon, Ho Kyong
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Competitive Research Funds
    Environmental Science and Engineering Program
    OCRF- Special Academic Partnership
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2016-02-20
    Online Publication Date
    2016-02-20
    Print Publication Date
    2016-06
    Permanent link to this record
    http://hdl.handle.net/10754/596859
    
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    Abstract
    The pilot-scale fertiliser driven forward osmosis (FDFO) and nanofiltration (NF) system was operated in the field for about six months for the desalination of saline groundwater from the coal mining activities. Long-term operation of the FDFO-NF system indicates that simple hydraulic cleaning could effectively restore the water flux with minimal chemical cleaning frequency. No fouling/scaling issues were encountered with the NF post-treatment process. The study indicates that, FDFO-NF desalination system can produce water quality that meets fertigation standard. This study also however shows that, the diffusion of solutes (both feed and draw) through the cellulose triacetate (CTA) FO membrane could be one of the major issues. The FO feed brine failed to meet the effluent discharge standard for NH4+ and SO42+ (reverse diffusion) and their concentrations are expected to further increase at higher feed recovery rates. Low rejection of feed salts (Na+, Cl−) by FO membrane may result in their gradual build-up in the fertiliser draw solution (DS) in a closed FDFO-NF system eventually affecting the final water quality unless it is balanced by adequate bleeding from the system through NF and re-reverse diffusion towards the FO feed brine. Therefore, FO membrane with higher reverse flux selectivity than the CTA-FO membrane used in this study is necessary for the application of the FDFO desalination process.
    Citation
    Fertiliser drawn forward osmosis process: Pilot-scale desalination of mine impaired water for fertigation 2016 Journal of Membrane Science
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2016.02.024
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0376738816300813
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2016.02.024
    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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