Highly permeable double-skinned forward osmosis membranes for anti-fouling in the emulsified oil-water separation process
KAUST DepartmentWater Desalination and Reuse Research Center (WDRC)
MetadataShow full item record
AbstractForward osmosis (FO) has attracted wide attention in recent years. However, the FO performance may be restricted due to internal concentration polarization (ICP) and fast fouling propensity that occurs in the membrane sublayer. Particularly, these problems significantly affect the membrane performance when treating highly contaminated oily wastewater. Recently, double-skinned flat sheet cellulose acetate (CA) membranes consisting of two selective skins via the phase inversion method have demonstrated less ICP and fouling propensity over typical single-skinned membranes. However, these membranes exhibit low water fluxes of <12 LMH under 2 M NaCl draw solution. Therefore, a novel double-skinned FO membrane with a high water flux has been aimed for in this study for emulsified oil-water treatment. The double-skinned FO membrane comprises a fully porous sublayer sandwiched between (i) a truly dense skin for salt rejection and (ii) a fairly loose dense skin for emulsified oil particle rejection. The former dense skin is a polyamide synthesized via interfacial polymerization, while the latter one is a self-assembled sulfonated pentablock copolymer (Nexar copolymer) layer. The resultant double-skinned membrane exhibits a high water flux of 17.2 LMH and a low reverse salt transport of 4.85 gMH using 0.5 M NaCl as the draw solution and DI water as the feed. The double-skinned membrane outperforms the single-skinned membrane with much lower fouling propensity for emulsified oil-water separation. © 2014 American Chemical Society.
SponsorsThe authors would like to thank the Singapore National Research Foundation under its Competitive Research Program for the project entitled "Advanced FO Membranes and Membrane Systems for Wastewater Treatment, Water Reuse, and Seawater Desalination" (Grant Nos. R-279-000-336-281 and R-278-000-339-281) and the Kraton Polymers, LLC. for the project entitled "Evaluation of Nexar Polymers for Water Filtration Applications" (Grant No. R-279-000-396-597). Thanks are due to Dr. C. L. Willis for his kind support and help.
PublisherAmerican Chemical Society (ACS)
- Anti-Fouling Double-Skinned Forward Osmosis Membrane with Zwitterionic Brush for Oily Wastewater Treatment.
- Authors: Ong CS, Al-Anzi B, Lau WJ, Goh PS, Lai GS, Ismail AF, Ong YS
- Issue date: 2017 Jul 31
- Water reclamation from emulsified oily wastewater via effective forward osmosis hollow fiber membranes under the PRO mode.
- Authors: Han G, de Wit JS, Chung TS
- Issue date: 2015 Sep 15
- Synthesis and characterization of novel forward osmosis membranes based on layer-by-layer assembly.
- Authors: Saren Q, Qiu CQ, Tang CY
- Issue date: 2011 Jun 15
- Sustainable water recovery from oily wastewater via forward osmosis-membrane distillation (FO-MD).
- Authors: Zhang S, Wang P, Fu X, Chung TS
- Issue date: 2014 Apr 1
- Fouling propensity of forward osmosis: investigation of the slower flux decline phenomenon.
- Authors: Lay WC, Chong TH, Tang CY, Fane AG, Zhang J, Liu Y
- Issue date: 2010