Composite forward osmosis hollow fiber membranes: Integration of RO- and NF-like selective layers to enhance membrane properties of anti-scaling and anti-internal concentration polarization

One of the major barriers that hinder the application of forward osmosis (FO) processes is the lack of optimized membranes that possess high water flux, low salt leakage and good anti-internal concentration polarization (ICP) and anti-fouling/anti-scaling properties during practical FO operations. In this study, novel composite FO hollow fiber membranes with an RO-like selective skin and an NF-like secondary selective skin were successfully developed for the first time. The fabrication procedures involved making ultrafiltration hollow fiber substrate using poly(amide–imide) (PAI) polymer material via phase inversion method, followed by interfacial polymerization (IP) and chemical modification to yield a polyamide RO-like inner skin and a positively charged NF-like outer skin, respectively. It was found that the sequence of conducting IP on the substrate inner surface prior to the chemical modification of the outer skin was preferred in order to achieve better performance for the resultant double-skinned hollow fibers. The newly developed FO hollow fibers exhibited high water permeability of 2.05 L/m2 h bar and 85% rejection to NaCl at 1 bar pressure as well as superior FO water flux of 41.3 L/m2 h and low ratio of salt flux over water flux of 0.126 g/L when using DI water and 2.0 M NaCl as feed and draw solutions, respectively, in the active layer facing draw solution (AL-DS) orientation. Furthermore, the experimental results showed that the composite FO hollow fiber membrane was able to outperform single-skinned membrane when the feed contains divalent ions or the feed exhibits high scaling tendency to membrane. This suggested that the integration of RO- and NF-like two selective skins in FO membrane is an effective way to minimize the ICP effect, mitigate the membrane scaling and thus enhance the feasibility of FO processes for practical applications.

[1]  Chuyang Y. Tang,et al.  Modeling double-skinned FO membranes , 2011 .

[2]  Amy E. Childress,et al.  The forward osmosis membrane bioreactor: A low fouling alternative to MBR processes , 2009 .

[3]  S. Loeb,et al.  Effect of porous support fabric on osmosis through a Loeb-Sourirajan type asymmetric membrane , 1997 .

[4]  J. P. Boom,et al.  Retention measurements of nanofiltration membranes with electrolyte solutions , 1998 .

[6]  Leyuan Shi,et al.  Effect of substrate structure on the performance of thin-film composite forward osmosis hollow fiber membranes , 2011 .

[7]  Robert L McGinnis,et al.  Desalination by ammonia–carbon dioxide forward osmosis: Influence of draw and feed solution concentrations on process performance , 2006 .

[8]  T. A. Hatton,et al.  Hyperbranched polyethyleneimine induced cross-linking of polyamide-imide nanofiltration hollow fiber membranes for effective removal of ciprofloxacin. , 2011, Environmental science & technology.

[9]  S. Loeb.  Large-scale power production by pressure-retarded osmosis, using river water and sea water passing through spiral modules , 2002 .

[10]  C. D. Lundin,et al.  A multi-barrier osmotic dilution process for simultaneous desalination and purification of impaired water , 2010 .

[11]  D. T. Liang,et al.  Fabrication of poly(vinylidene fluoride-co-hexafluropropylene) (PVDF-HFP) asymmetric microporous hollow fiber membranes , 2007 .

[12]  Konstantinos Petrotos,et al.  On the direct osmotic concentration of liquid foods. Part I: Impact of process parameters on process performance , 2007 .

[13]  Chuyang Y. Tang,et al.  Characteristics and potential applications of a novel forward osmosis hollow fiber membrane , 2010 .

[14]  Chuyang Y. Tang,et al.  Characterization of novel forward osmosis hollow fiber membranes , 2010 .

[15]  K. Tung,et al.  Nanofiltration membranes synthesized from hyperbranched polyethyleneimine , 2009 .

[16]  Amy E. Childress,et al.  Forward osmosis: Principles, applications, and recent developments , 2006 .

[17]  J. McCutcheon,et al.  Influence of concentrative and dilutive internal concentration polarization on flux behavior in forward osmosis , 2006 .

[18]  Rong Wang,et al.  Fabrication of novel poly(amide–imide) forward osmosis hollow fiber membranes with a positively charged nanofiltration-like selective layer , 2011 .

[19]  Kai Yu Wang,et al.  Double-Skinned Forward Osmosis Membranes for Reducing Internal Concentration Polarization within the Porous Sublayer , 2010 .

[20]  Dezhong Xiao,et al.  The role of physical and chemical parameters on forward osmosis membrane fouling during algae separa , 2011 .

[21]  Anthony G Fane,et al.  Impacts of salinity on the performance of high retention membrane bioreactors for water reclamation: A review. , 2010, Water research.

[22]  Rong Wang,et al.  High performance flat sheet forward osmosis membrane with an NF-like selective layer on a woven fabric embedded substrate , 2012 .

[23]  Chuyang Y. Tang,et al.  Coupled effects of internal concentration polarization and fouling on flux behavior of forward osmosis membranes during humic acid filtration , 2010 .

[24]  Menachem Elimelech,et al.  Performance evaluation of sucrose concentration using forward osmosis , 2009 .

[25]  Qian Yang,et al.  Dual-layer hollow fibers with enhanced flux as novel forward osmosis membranes for water production. , 2009, Environmental science & technology.

[26]  J. McCutcheon,et al.  Internal concentration polarization in forward osmosis: role of membrane orientation , 2006 .

[27]  Rong Wang,et al.  Synthesis and characterization of flat-sheet thin film composite forward osmosis membranes , 2011 .

[28]  E. Drioli,et al.  Recent advances on membrane processes for the concentration of fruit juices: a review , 2004 .

[29]  Robert L McGinnis,et al.  A novel ammonia–carbon dioxide osmotic heat engine for power generation , 2007 .

[30]  Menachem Elimelech,et al.  High performance thin-film composite forward osmosis membrane. , 2010, Environmental science & technology.

[31]  D. T. Liang,et al.  Effect of additives on the fabrication of poly (vinylidene fluoride-co-hexafluropropylene) (PVDF-HFP) asymmetric microporous hollow fiber membranes , 2008 .

[32]  Kamalesh K. Sirkar,et al.  Interfacially polymerized hydrophilic microporous thin film composite membranes on porous polypropylene hollow fibers and flat films , 2006 .

[33]  D.J.H. Harmsen,et al.  Membrane fouling and process performance of forward osmosis membranes on activated sludge , 2008 .

[34]  Stein Erik Skilhagen,et al.  Membrane processes in energy supply for an osmotic power plant , 2008 .

[35]  Ho Kyong Shon,et al.  Physicochemical pretreatment of seawater: fouling reduction and membrane characterization , 2009 .

[36]  Menachem Elimelech,et al.  Global challenges in energy and water supply: the promise of engineered osmosis. , 2008, Environmental science & technology.

[37]  Gary L. Amy,et al.  Well-constructed cellulose acetate membranes for forward osmosis: Minimized internal concentration polarization with an ultra-thin selective layer , 2010 .

[38]  Menachem Elimelech,et al.  Relating Nanofiltration Membrane Performance to Membrane Charge (Electrokinetic) Characteristics , 2000 .