Fertiliser drawn forward osmosis process: Pilot-scale desalination of mine impaired water for fertigation
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Type
ArticleAuthors
Phuntsho, SherubKim, Jung Eun
Johir, Mohammad AH
Hong, Seungkwan

Li, Zhenyu
Ghaffour, NorEddine

Leiknes, TorOve

Shon, Ho Kyong
KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionCompetitive Research Funds
Environmental Science and Engineering Program
OCRF- Special Academic Partnership
Water Desalination and Reuse Research Center (WDRC)
Date
2016-02-20Online Publication Date
2016-02-20Print Publication Date
2016-06Permanent link to this record
http://hdl.handle.net/10754/596859
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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 SciencePublisher
Elsevier BVJournal
Journal of Membrane ScienceAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S0376738816300813ae974a485f413a2113503eed53cd6c53
10.1016/j.memsci.2016.02.024