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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20 Citations (SciVal)
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Abstract

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
Volume578
Early online date20 Feb 2019
DOIs
Publication statusPublished - 15 May 2019

Funding

This work was supported by Grants from the National Key Research and Development Program of China [grant number 2016YFC0400707 ]; the National Natural Science Foundation of China [grant number 51578265 ]; the Six Major Talent Peaks of Jiangsu Province [grant number 2018-JNHB-014 ]; the Major Science and Technology Innovation Projects of Shandong Province [grant number 2018CXGC1006 ]; and the Fundamental Research Funds for the Central Universities [grant number JUSRP 51728A ]. Appendix A

Keywords

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

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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