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Effects of Solute Permeability on Permeation and Solute Rejection in Membrane Filtration
Author(s) -
Lopes Gustavo H.,
Ibaseta Nelson,
Guichardon Pierrette,
Haldenwang Pierre
Publication year - 2018
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201700203
Subject(s) - permeation , concentration polarization , membrane , permeability (electromagnetism) , chemistry , reverse osmosis , chromatography , filtration (mathematics) , desalination , forward osmosis , cross flow filtration , chemical engineering , biochemistry , statistics , mathematics , engineering
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.