Effect of salt type on mass transfer in reverse osmosis thin film composite membranes

Khayet, M.; Mengual, J.I.

doi:10.1016/j.desal.2004.07.024

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…This further proves the excellent potential of the selected membranes for the separation and concentration of ammonium sulfate. It has been shown by others that experiments conducted using NaCl can be used to predict the performance of the same membrane to concentrate different ions using empirical correlations at feed concentrations that are less than 0.1 mol·l −1 [20], and so the results of this study could also be used to develop similar models for solutions at greater concentrations.…”

Section: Permeate Compositions For Various Concentrations Of (Nh 4 ) mentioning

confidence: 90%

Characterization of commercial RO membranes for the concentration of ammonia converted to ammonium sulfate from anaerobic digesters

et al. 2015

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Section: Permeate Compositions For Various Concentrations Of (Nh 4 ) mentioning

confidence: 90%

Characterization of commercial RO membranes for the concentration of ammonia converted to ammonium sulfate from anaerobic digesters

et al. 2015

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“…Mass transfer phenomena in reverse osmosis (RO) processes have been studied experimentally and theoretically for many decades in order to understand how water and solute permeation occur within membrane modules [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], so as to identify the factors that determine the performance of membrane modules. One of the most critical mass transfer phenomena present in an RO membrane module is concentration polarisation (CP), which is caused by the accumulation of solute(s) rejected by a selective RO membrane, resulting in an elevated solute concentration on the membrane surface [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

The effect of feed spacer geometry on membrane performance and concentration polarisation based on 3D CFD simulations

Adjiman

2017

Journal of Membrane Science

126

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Feed spacers are used in spiral wound reverse osmosis (RO) membrane modules to keep the membrane sheets apart as well as to enhance mixing. They are beneficial to membrane performance but at the expense of additional pressure loss. In this study, four types of feed spacer configurations are investigated, with a total of 20 geometric variations based on commercially available spacers and selected filament angles. The impact of feed spacer design on membrane performance is investigated by means of three-dimensional (3D) computational fluid dynamics (CFD) simulations, where the solution-diffusion model is employed for water and solute transport through RO membranes.Numerical simulation results show that, for the operating and geometric conditions examined, fully woven spacers outperform other spacer configurations in mitigating concentration polarisation (CP).When designed with a mesh angle of 60º, fully woven spacers also deliver the highest water flux, although the associated pressure drops are slightly higher than their nonwoven counterparts. Middle layer geometries with a mesh angle of 30º produce the lowest water flux. On the other hand, spacers with a mesh angle of 90º show the lowest pressure drop among all the filament arrangements examined. Furthermore, the computational model presented here can also be used to predict membrane performance for a given feed spacer type and geometry.

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“…The concentration (TDS) of the used feed water is 4 g/L. The salt rejection factor (R) or solute percentage removal is calculated from the following relation [4,11,12,17], and [18];…”

Section: Experimental Investigationmentioning

confidence: 99%

Performance and Optimization of Air Gap Membrane Distillation System for Water Desalination

Khalifa

Lawal

2015

Arab J Sci Eng

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Membrane distillation is a developing thermally driven membrane separation technology used for water desalination. The air gap membrane distillation (AGMD) is one of the important basic configurations for applying this technology. The performance of AGMD system is experimentally investigated at different operating and design variables, including feed temperature, feed flow rate, coolant temperature, coolant flow rate, and air gap width. Taguchi method and applied regression were employed to model and optimize the performance of the AGMD system, by obtaining the best parameters combination based on three different levels of significant variables. Analysis of variance was performed to determine the effect of each factor on the system's performance. A regression model was subsequently generated for calculating the performance of the AGMD system. Feed temperature and the air gap width are the most effective parameters on the performance of AGMD system. The measured and calculated optimal fluxes were found to be 76.0457 and 74.5916 kg/m 2 hr; respectively. The percentage difference between model calculations and the experimental results at optimum conditions is 1.95 %.

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Effect of salt type on mass transfer in reverse osmosis thin film composite membranes

Cited by 12 publications

References 4 publications

Characterization of commercial RO membranes for the concentration of ammonia converted to ammonium sulfate from anaerobic digesters

Characterization of commercial RO membranes for the concentration of ammonia converted to ammonium sulfate from anaerobic digesters

The effect of feed spacer geometry on membrane performance and concentration polarisation based on 3D CFD simulations

Performance and Optimization of Air Gap Membrane Distillation System for Water Desalination

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