Journal
CHEMICAL ENGINEERING & TECHNOLOGY
Volume 41, Issue 4, Pages 788-797Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ceat.201700203
Keywords
Concentration polarization; Permeate flux; Reverse-osmosis desalination; Solute permeability; Solute rejection
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Funding
- Conseil Regional de Provence-Alpes-Cote d'Azur
- Ecole Centrale de Marseille
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Membrane solute permeability plays a role in the buildup of concentration polarization in pressure-driven crossflow filtration processes, and thus in the determination of the permeate flux, solute rejection, retentate flux, and concentration. Reverse-osmosis desalination with membranes of fixed solvent permeability but of variable selectivity with respect to the solute is numerically examined. The study highlights an intricate coupling between retentate and filtrate properties. In particular, it reveals that, for given values of solute permeability and feed concentration, there is a maximum operating pressure that optimizes solute rejection regardless of the feed salinity. The conditions leading to this and to other peculiar behaviors for permeation fluxes and concentrations are identified.
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