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Kinetics of ethanol fermentations in membrane cell recycle fermentors
Author(s) -
Lee Chang Woo,
Chang Ho Nam
Publication year - 1987
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260290910
Subject(s) - ethanol , yeast , chemistry , fermentation , chromatography , filtration (mathematics) , ethanol fuel , ethanol fermentation , membrane , biomass (ecology) , yield (engineering) , biochemistry , food science , biology , materials science , agronomy , statistics , mathematics , metallurgy
Ethanol fermentation by yeast was carried out in a cell filtration recycle system with a hollow‐fiber membrane filter. Maximum biomass concentrations up to 210 g dry wt/L were obtained, but in normal operation concentrations they were between 100 and 150 g/L. The ethanol productivity using 14% glucose feed was 85 g/L h, with an ethanol concentration of 65 g/L and an ethanol yield of over 90%. The ethanol productivity and yeast growth rate decreased as the cell concentration increased beyond a certain level. The cell mass in the reactor was maintained by a proper manipulation of diluticn rate and bleed ratio depending on the growth rate.