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NATURE OF THE DEPOSIT ON REVERSE OSMOSIS MEMBRANES DURING CONCENTRATION OF PECTIN/CELLULOSE SOLUTIONS
Author(s) -
WATANABE ATSUO,
KIMURA SHOJI,
OHTA YOSHIO,
RANDALL JOHN M.,
KIMURA SUSUMU
Publication year - 1979
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1979.tb06473.x
Subject(s) - pectin , permeation , cellulose , membrane , chemistry , chromatography , fouling , reverse osmosis , regenerated cellulose , chemical engineering , desalination , biochemistry , engineering
Model solutions consisting of varying concentration of the major fouling components of mandarin orange juice, pectin and cellulose, were studied. The deposits were scraped from the membranes and analyzed for weights and concentrations of pectin and cellulose. Suspensions of cellulose with no pectin caused no decrease in permeation flux, but large declines in permeation flux occurred during concentration of solutions of pectin and cellulose. Weights and concentrations of both components in the deposits changed with altering operating conditions and decreased with increasing mean flow velocity. Resistance of the deposit to water permeability (Rg) was related to the concentration of solute at the membrane surface (Cg) by the empirical equation, Rg =α Cg 1.7 (α= constant). Accumulation of deposit on the membrane was in two forms: viscous layer and film layer. The former was a common form of deposit accumulated during the concentration of model solution under all conditions, but the latter was formed only under conditions at higher permeation flux with modelately high mean flow velocity. The film layer was insoluble in water but soluble in 0.0N HCl solution.