Well-constructed cellulose acetate membranes for forward osmosis: Minimized internal concentration polarization with an ultra-thin selective layer

Zhang, Sui; Wang, Kaiyu; Chung, Tai‐Shung; Chen, Hongmin; Jean, Y. C.; Amy, Gary L.

doi:10.1016/j.memsci.2010.05.056

Cited by 330 publications

(187 citation statements)

References 50 publications

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“…These methods utilize osmotic pressure difference between a dilute feed solution and a concentrated draw solution to induce mass transport of water through semipermeable membranes from the feed stream into the draw solution. Increasing demand for water and electricity, combined with encouraging results from ODMP studies in recent years, have accelerated the development of ODMP technologies, including a flurry of membrane development work [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] intended to enable further improvement and commercialization of ODMPs.…”

Section: Introductionmentioning

confidence: 99%

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

et al. 2013

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Osmotically driven membrane processes (ODMPs) such as forward osmosis (FO) and pressure retarded osmosis (PRO) are extensively investigated for utilization in a broad range of applications. In ODMPs, the operating conditions and membrane properties play more critical roles in mass transport and process performance than in pressure-driven membrane processes. Search of the literature reveals that ODMP membranes, especially newly developed ones, are tested under different temperatures, draw solution compositions and concentrations, flow rates, and pressures. In order to compare different membranes, it is important to develop standard protocols for testing of membranes for ODMPs. In this article we present a standard methodology for testing of ODMP membranes based on experience gained and operating conditions used in FO and PRO studies in recent years. A round-robin testing of two commercial membranes in seven independent laboratories revealed that water flux and membrane permeability coefficients were similar when participants performed the experiments and calculations using the same protocols. The thin film composite polyamide membrane exhibited higher water and salt permeability than the asymmetric cellulosebased membrane, but results with the high permeability thin-film composite membrane were more scattered. While salt rejection results in RO mode were relatively similar, salt permeability coefficients for both membranes in FO mode were more varied. Results suggest that high permeability ODMP membranes should be tested at lower hydraulic pressure in RO mode and that RO testing be conducted with the same membrane sample used for testing in FO mode. AbstractOsmotically driven membrane processes (ODMP) such as forward osmosis (FO) and pressure retarded osmosis (PRO) are extensively investigated for utilization in a broad range of applications. In ODMPs, the operating conditions and membrane properties play more critical roles in mass transport and process performance than in pressure-driven membrane processes.Search of the literature reveals that ODMP membranes, especially newly developed ones, are tested under different temperatures, draw solution compositions and concentrations, flowrates, and pressures. In order to compare different membranes, it is important to develop standard protocols for testing of membranes for ODMP. In this article we present a standard methodology for testing of ODMP membranes based on experience gained and operating conditions used in FO and PRO studies in recent years. A round-robin testing of two commercial membranes in seven independent laboratories revealed that water flux and membrane permeability coefficients were similar when participants performed the experiments and calculations using the same protocols. The thin film composite polyamide membrane exhibited higher water and salt permeability than the asymmetric cellulose-based membrane, but results with the high permeability thin-film composite membrane were more scattered. While salt rejection results in RO mode were...

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Section: Introductionmentioning

confidence: 99%

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

et al. 2013

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“…For FO, the main direction of current research is towards improving intrinsic and transport properties of membranes on a molecular level [20][21][22][23][24][25][26][27][28]. However, the effects of these improvements on the energy efficiency of different FO desalination processes remain unexplored.…”

Section: Introductionmentioning

confidence: 99%

Energy consumption for desalination — A comparison of forward osmosis with reverse osmosis, and the potential for perfect membranes

2016

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“…One of the methods widely used to study structureproperties relationships in polymeric materials is positron annihilation lifetime spectroscopy (PALS) (see, for instance [11][12][13][14][15][16][17] and references therein). The various important information on the positronium (Ps) formation (the electronpositron bound state) [18,19] in polymers can be extracted from PALS analysis.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature positron annihilation study of B+-ion implanted PMMA

Kavetskyy

Tsmots

Voloshanska

et al. 2014

Low Temperature Physics

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Well-constructed cellulose acetate membranes for forward osmosis: Minimized internal concentration polarization with an ultra-thin selective layer

Cited by 330 publications

References 50 publications

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

Energy consumption for desalination — A comparison of forward osmosis with reverse osmosis, and the potential for perfect membranes

Low-temperature positron annihilation study of B+-ion implanted PMMA

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