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 language | English |
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Pages (from-to) | 95-102 |
Number of pages | 8 |
Journal | Journal of Membrane Science |
Volume | 578 |
Early online date | 20 Feb 2019 |
DOIs | |
Publication status | Published - 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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