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Abstract ▼ AI-Helper

The functional relationship between the initial cell concentration and the ethanol productivity was investigated in the repeated batch fermentation of Sacharomyces cerevisiae ATCC 24858. The repeated batch fermentations were performed in the range of 60 to $150g/\ell$ of initial sugar con...

The functional relationship between the initial cell concentration and the ethanol productivity was investigated in the repeated batch fermentation of Sacharomyces cerevisiae ATCC 24858. The repeated batch fermentations were performed in the range of 60 to $150g/\ell$ of initial sugar concentration and 17.5g/$\ell$ to $53.1g/\ell$ of initial cell concentration. The time of one batch fermentation was 1 or 2 hours and the batch fermentation was repeated ten times in every repeated formentaction. The functional relationship showed that the productivity increased non-linearly according to the increase of initial cell concentration regardless of initial sugar concentration. When the initial concentration of sugar was $60g/\ell$ and that of biomass was $34.5g/\ell$, the fermentation was completed within one hour and its ethanol productivity was $26.7g/\ell$.hr, the latter including the times of cell separation, pouring the new substrate into a flask and sampling. When the initial sugar concentration was $120g/\ell$ and the initial cell concentration $50.3g/\ell$, the fermentation was also finished within one hour and its productivity was $45.8g/\ell$$.$hr, The maximum ethanol productivity for eight different repealed fermentations in this work was $53g/\ell$.hr.