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Reverse osmosis of lactic acid fermentation broths
Author(s) -
Schlicher Laura R.,
Cheryan Munir
Publication year - 1990
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280490204
Subject(s) - lactic acid , fermentation , chemistry , osmotic pressure , membrane , osmosis , dissociation (chemistry) , chromatography , lactic acid fermentation , reverse osmosis , forward osmosis , cellulose acetate , biochemistry , organic chemistry , biology , bacteria , genetics
Lactic acid model solutions and fermentation broths were concentrated using a tubular thin‐film composite reverse osmosis membrane. Flux increased linearly with applied transmembrane pressure and was relatively unaffected by flow rate. Osmotic pressures of 1% lactate solutions were 280–560 kPa, depending on the pH or degree of dissociation. Rejections increased with applied pressure. Higher pH caused a slight decrease in flux (due in part to the higher osmotic pressure) and a significant increase in rejection. Above pH 5·6, rejections of lactate and residual sugars were > 97%. In contrast, with cellulose acetate membranes, flux was generally lower and lactate rejection was proportional to the degree of dissociation at lower pressures.