Continuous ethanol production by flocculating yeast in the fluidized bed bioreactor.
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.
Faculty of Process and Environmental Engineering, Bioprocess Engineering Department, Technical University of Lódź, Poland.
A
A
Wieczorek
H
H
Michalski
D003470:Culture Media; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D005427:Flocculation; D007218:Industrial Microbiology / Q000379:methods*; D008965:Molasses; D012441:Saccharomyces cerevisiae / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology
D003470:Culture Media; D000431:Ethanol