Continuous ethanol production by flocculating yeast in the fluidized bed bioreactor |
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Authors: | A Wieczorek H Michalski |
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Institution: | Faculty of Process and Environmental Engineering, Bioprocess Engineering Department, Technical Unirersitv of ?ód?, Wólczańska 175, 90-924 ?ód?, Poland |
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Abstract: | Abstract: Continuous fermentation by a highly flocculant strain of the yeast Saccharomyces cerevisiae was carried out in a tower fluidized-bed bioreactor. The synthetic and molasses media with a total sugar concentration of 17% (w/v) were used for fermentation. Different dilution rates were tested. Stable cell densities of 50 kg m-3(dry weight) were maintained for all dilution rates. The ethanol productivity was increasing linearly with dilution rates up to 15—20 kg m-3 h-1. Aeration of the culture stabilized flocculating activity and viability of yeast and also permitted long-term operation of the bioreactor. |
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Keywords: | Continuous ethanol production Flocculating yeast Fluidized bed bioreactor |
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