Synthesis and characterization of flat-sheet thin film composite forward osmosis membranes

Wei, Jing; Qiu, Changquan; Tang, Chuyang Y.; Wang, Rong; Fane, Anthony G.

doi:10.1016/j.memsci.2011.02.013

Cited by 544 publications

(413 citation statements)

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“…The data for AL-DS and AL-FS were divided into two groups and equation (1) For AL-DS the 'B' value was 2.44 x 10 -7 m/s but for AL-FS it was 1.88 x 10 -7 m/s. These values are comparable with the value obtained using an RO set-up for the same membrane, namely 2.56 x10 -7 m/s (see entry CTA-HW in Table 3 of [13]). …”

Section: Determination Of Water Permeability and Salt Permeability Cosupporting

confidence: 83%

“…The permeability was determined in the flat sheet laboratory unit to be 0.75 LMH per bar which gives an 'A' parameter of 2.08 x 10 -12 m/s per Pa. This is close to the value of 1.87 x 10 -12 m/s per Pa determined elsewhere [14] and comparable with the value of 3.3 x 10 -12 m/s per Pa [13]. The value determined experimentally was used in all subsequent calculations.…”

Section: Determination Of Water Permeability and Salt Permeability Cosupporting

confidence: 78%

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Analysis of the influence of module construction upon forward osmosis performance

et al. 2018

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. (2018) 'Analysis of the in uence of module construction upon forward osmosis performance. ', Desalination., Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe potential of a commercial forward osmosis (FO) module to recover water from NEWater brine, an RO retentate, was assessed by taking an innovative approach to obtaining the mass transfer coefficients. The performance comparison of the spiral wound (S-W) FO module with that of the flat sheet laboratory unit suggests that the winding involved in S-W construction can adversely affect performance; the values for the S-W mass transfer coefficients were half of those expected. This firstof-its-kind performance comparison utilised coupons of the membrane and spacers taken from the module. The module was used both in the conventional manner for FO and in the reverse manner with the active layer facing the draw solution. Estimates of membrane parameters and mass transfer coefficients experiments for the two orientations were obtained using pure water, 10mM and 25mM NaCl solution on the feed side and 1M NaCl as draw solution. The fouling potential of NEWater brine per se was found to be low. These are the first results with a S-W module that suggest potential for this niche application; nevertheless the level of the water flux through the S-W module clearly indicates that industrial applications of S-W FO will be constrained to special cases.

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Section: Determination Of Water Permeability and Salt Permeability Cosupporting

confidence: 83%

Section: Determination Of Water Permeability and Salt Permeability Cosupporting

confidence: 78%

Analysis of the influence of module construction upon forward osmosis performance

et al. 2018

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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%

“…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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“…The dilute PAA-Na draw solution after FO can be efficiently concentrated via an UF process and reused to the FO process. Compared to those conventional inorganic draw solutes, such as NaCl, [70] MgCl2, [69] the polyelectrolytes of PAA-Na exhibit comparable water fluxes but much lower reverse solute diffusion in FO. Considering the superiority of PAA-Na as draw solutes, they were used for acid dye wastewater treatment via an forward osmosis-membrane distillation (FO-MD) hybrid system.…”

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confidence: 93%

Progress in Forward Osmosis Membrane Separation Process

Chen¹,

Xu²,

Ge³

2017

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Forward osmosis (FO) has been extensively investigated and demonstrated its advantages in a range of FO applications over the past decade. However, challenges still remain in terms of the lack of both efficient FO membranes and appropriate draw solutes for practical FO applications. To promote the advancement of FO technology, considerable efforts have been made in exploring novel FO membranes and draw solutes in recent years. This paper will provide a short review on the progress of both FO membranes and draw solutes. First of all, a brief overview on FO principle is given. Then the progress in FO technology related to FO membrane and draw solute is presented with specific examples. Finally, challenges and future directions of FO technology in exploring efficient FO membranes and promising draw solutes are also highlighted. This article may provide new insights into the future development of FO technology and promote practical FO applications.Keywords forward osmosis, draw solution, forward osmosis membrane, forward osmosis application IntroductionFreshwater shortage has been becoming a more and more severe problem globally. [1][2][3][4] To mitigate this problem, various technologies for clean water production have been explored worldwide recently. [5][6][7][8][9] Membrane technology has shown a great potential in water treatment in view of the advantages of no phase change, strong adaptability, relatively simple operation and low cost. [5,[10][11][12] A range of pressure-driven membrane processes, such as microfiltration (MF), [13][14][15][16] ultrafiltration (UF), [13,17,18] nanofiltration (NF), [19][20][21] and reverse osmosis (RO) [22][23][24][25][26] have been extensively used for clean water production through either wastewater reuse or brackish water/ seawater desalination. However, some issues, such as severe membrane fouling, low water recovery rate, intensive-energy consumption and relatively low quality of product water, occur frequently during these processes. [10,13,17,23,27] FO has been recognized as a promising membrane process because of the following characteristics: (1) no requirement of hydraulic pressure; (2) a relatively high water recovery rate; (3) low membrane fouling propensity due to the absence of hydraulic pressure; (4) environmental friendliness. Given these merits, FO technology has been applied to a wide range of fields, such as seawater/brackish water desalination, [4,24,28] wastewater treatment, [8,[29][30][31] and many other areas. [32][33][34][35][36] Although FO exhibits a great potential in alleviating the issues caused by freshwater shortage, challenges, such as relatively low water permeability, high reverse solute diffusion, severe concentration polarization (CP), and membrane fouling, are still present in FO applications. [37][38][39] To eliminate these problems, exploration of appropriate semi-permeable FO membrane and draw solute is urgently needed. Great efforts have been made in the development of FO technology in recent years, and a wide range of powerful FO membra...

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Synthesis and characterization of flat-sheet thin film composite forward osmosis membranes

Cited by 544 publications

References 46 publications

Analysis of the influence of module construction upon forward osmosis performance

Analysis of the influence of module construction upon forward osmosis performance

Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes

Progress in Forward Osmosis Membrane Separation Process

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