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

Sherub Phuntsho, Jung Eun Kim, Mohammad A H Johir, Seungkwan Hong, Zhenyu Li, Noreddine Ghaffour, TorOve Leiknes, Ho Kyong Shon

Research output: Contribution to journalArticle

47 Citations (Scopus)

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 SO4 2+ (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.

Original languageEnglish
Pages (from-to)22-31
Number of pages10
JournalJournal of Membrane Science
Volume508
DOIs
Publication statusPublished - 2016 Jun 15

Keywords

  • Desalination
  • Fertigation
  • Forward osmosis (FO)
  • Irrigation
  • Pilot-scale operation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Biochemistry
  • Filtration and Separation

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