EDTA-based adsorption layer for mitigating FO membrane fouling via in situ removing calcium binding with organic foulants

Ling Li, Xinhua Wang, Ming Xie, Hailong Wang, Xiufen Li, Yueping Ren

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3 Citations (Scopus)
29 Downloads (Pure)


Forward osmosis (FO) is an emerging technology for wastewater treatment and reclamation. However, membrane fouling remains a strong hindrance to FO application. We proposed a novel approach for alleviating FO membrane fouling via in situ removing Ca 2+ binding with organic foulants using the EDTA-based adsorption layer. Results suggested that the EDTA-based adsorption layer can effectively remove the Ca 2+ binding with sodium alginate, and its adsorption capacity correspondingly increased as a function of Ca 2+ concentration in the feed solution. Owing to the effective extraction of Ca 2+ from the fouling layer by the EDTA-based adsorption layer, water flux of FO membrane was significantly enhanced, and fouling layer became easily removed by physical flushing, suggesting a remarkable alleviation of FO membrane fouling. Mitigation of FO membrane fouling by the EDTA-based adsorption layer was attributed to the fact that the fouling layer structure became more porous and looser after in situ removing Ca 2+ from the alginate-Ca 2+ gel networks. This study demonstrated a novel fouling control strategy via in situ removing Ca 2+ binding with the organic foulants, providing a new avenue for FO membrane fouling management.

Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalJournal of Membrane Science
Early online date20 Feb 2019
Publication statusPublished - 15 May 2019


  • Calcium
  • EDTA
  • Forward osmosis
  • Membrane fouling
  • Organic foulants

ASJC Scopus subject areas

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

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