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Anti-fouling double-skinned forward osmosis membrane with zwitterionic brush for oily wastewater treatment

Ong, C. S. and Al-Anzi, B. and Lau, W. J. and Goh, P. S. and Lai, G. S. and Ismail, A. F. and Ong, Y. S. (2017) Anti-fouling double-skinned forward osmosis membrane with zwitterionic brush for oily wastewater treatment. Scientific Reports, 7 (1). ISSN 2045-2322

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Abstract

Despite its attractive features for energy saving separation, the performance of forward osmosis (FO) has been restricted by internal concentration polarization and fast fouling propensity that occur in the membrane sublayer. These problems have significantly affected the membrane performance when treating highly contaminated oily wastewater. In this study, a novel double-skinned FO membrane with excellent anti-fouling properties has been developed for emulsified oil-water treatment. The double-skinned FO membrane comprises a fully porous sublayer sandwiched between a highly dense polyamide (PA) layer for salt rejection and a fairly loose dense bottom zwitterionic layer for emulsified oil particle removal. The top dense PA layer was synthesized via interfacial polymerization meanwhile the bottom layer was made up of a zwitterionic polyelectrolyte brush-(poly(3-(N-2-methacryloxyethyl-N,N-dimethyl) ammonatopropanesultone), abbreviated as PMAPS layer. The resultant double-skinned membrane exhibited a high water flux of 13.7 ± 0.3 L/m2.h and reverse salt transport of 1.6 ± 0.2 g/m2.h under FO mode using 2 M NaCl as the draw solution and emulsified oily solution as the feed. The double-skinned membrane outperforms the single-skinned membrane with much lower fouling propensity for emulsified oil-water separation.

Item Type:Article
Uncontrolled Keywords:forward osmosis (FO), polyamide (PA)
Subjects:T Technology > TP Chemical technology
Divisions:Chemical Engineering
ID Code:74843
Deposited By: Fazli Masari
Deposited On:08 Mar 2018 05:11
Last Modified:08 Mar 2018 05:11

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