Thin-film composite hollow fiber membranes for pressure retarded osmosis (PRO) process with high power density

Chou, Shuren; Wang, Rong; Shi, Lei; She, Qianhong; Tang, Chuyang Y.; Fane, Anthony G.

doi:10.1016/j.memsci.2011.10.002

Cited by 315 publications

(205 citation statements)

References 20 publications

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“…As a result, the reported water and salt fluxes are scattered over a broad range. Testing conditions reported in recent publications on FO membrane development [7,8,12,13,15,[17][18][19][23][24][25][26][27][28][29] are summarized in Table 1. It can be seen from the data that both temperatures and draw solution concentrations are not consistent, and therefore, make membrane performance difficult to compare.…”

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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“…FO performance was evaluated for new kinds of FO membranes as hollow fiber FO (HFFO) membrane [36], polybenzimidazole (PBI) nanofiltration membrane [37], crosslinked layer-by-layer (xLbL) FO membrane [29], layerby-layer polyelectrolyte applied on a PES hollow fiber substrate [38], high flux FO membranes by chemically crosslinked layer-by-layer polyelectrolytes [39], novel poly (amide-imide) FO hollow fiber membranes with a positively charged selective layer [28], TFC FO membrane for PRO [40], FO membrane with sulfonated polyphenylenesulfone (sPPSU) as the supporting substrate [41], Cellulose acetate nanofiltration hollow fiber membranes for FO [42] cellulose acetate membranes for forward osmosis with an ultra-thin selective layer [43] and others [33,[44][45][46]. Some other unique and distinctive polifilration membranes, carbon nano tubes [47], aquaporin membranes [48] are also used for forward osmosis applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of the process parameters on hollow fiber-forward osmosis membrane performances

Majeed

Phuntsho

Sahebi

et al. 2015

Desalination and Water Treatment

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Continued efforts are made in improving the performance of the low-cost forward osmosis (FO) membrane process which utilizes naturally available osmotic pressure of the draw solution (DS) as the driving force. Selection of a suitable DS and development of a better performing membrane remained the main research focus. In this study, the performance of a hollow fiber forward osmosis (HFFO) membrane was evaluated with respect to various operating conditions such as different cross-flow directions, membrane orientation, solution properties, and solution flow rates (Reynolds number). The study observed that operating parameters significantly affect the performance of the FO process. FO comparatively showed better performance at counter-current orientation. NaCl, KCl, and NH 4 Cl were evaluated as DS carrying common anion. Properties of the anionic part of the DS were found important for flux outcome, whereas reverse solute flux (RSF) was largely influenced by the properties of DS cationic part. FO was operated at different DS and feed solution (FS) flow rates and FO outcome was assessed for varying DS and FS Reynolds number ratio. FO showed better flux outcome as Re ratio for DS and FS decreases and vice versa. Results indicated that by adjusting FO processes conditions, HFFO membrane could achieve significantly lower specific RSF and higher water flux outcome. It was observed that using 2 M NaCl as DS and deionized water as FS, HFFO successfully delivered flux of 62.9 LMH which is significantly high compared to many FO membranes reported in the literature under the active layer-DS membrane orientation mode.

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“…Studies of the power production possible with PRO systems have often been based on the zero-dimensional approximation model [1][2][3][4][5][6][7][8][9][10]. Under that model, the power produced by the system, comprised of an exchanger, a pump, and a turbine, is linearly proportional to the membrane area.…”

Section: Introductionmentioning

confidence: 99%

Limits of power production due to finite membrane area in pressure retarded osmosis

Banchik

Sharqawy

Lienhard

2014

Journal of Membrane Science

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Dimensionless analytical expressions for the power attainable from an ideal counterflow pressure retarded osmosis (PRO) system model are developed using a one-dimensional model that accounts for streamwise variations in concentration. This ideal PRO system has no salt permeation or concentration polarization. The expressions show that the optimal hydraulic pressure difference, for which the maximum power is produced, deviates significantly from the classical solution of one-half of the trans-membrane osmotic pressure difference, Δπ/2, as the dimensionless membrane area (MTU π ) increases and the ratio of draw to feed mass flow rates (MR) varies. The overall maximum power attainable from a PRO membrane is found to occur in the limit of infinitely large MTU π (an effectiveness of unity) and infinite MR. For an ideal PRO system which mixes seawater (35 g/kg) and river water (1.5 g/kg), the overall maximum power of 1.57 kJ per kilogram of feed can be attained at roughly MTU π of 15, an MR of 10, and a pressure of 0.83Δ . Due to economic considerations, a PRO system in practice will have limited membrane area and will operate at an effectiveness of less than unity.The present work can be used to estimate the operating conditions and area required for a PRO system of given performance. The effect of concentration polarization on optimal hydraulic pressure difference and maximum power performance is also investigated using a numerical model.

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Thin-film composite hollow fiber membranes for pressure retarded osmosis (PRO) process with high power density

Cited by 315 publications

References 20 publications

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

Influence of the process parameters on hollow fiber-forward osmosis membrane performances

Limits of power production due to finite membrane area in pressure retarded osmosis

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