Abstract
Ethanol production using Saccharomyces cerevisiae, promoted by the mineral kissiris, is reported on. A three-fold increase of ethanol productivity in the fermentation of molasses was achieved. An ethanol yield factor 0.43 g/g and conversion of 93.3% at an initial sugar concentration (ISC) 208.5 g/ l were obtained in the presence of this mineral in molasses fermentation, compared to 0.21 g/g and 44.2% in its absence. It is also shown that the fermentation of molasses takes place even at relatively higher ethanol levels, with kissiris contributing to a 35% reduction of the energy demand in grade-fuel and potable ethanol production. The proposed mineral was shown to have a smaller effect in fermentations carried out in synthetic media containing glucose or saccharose.
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