Study on Ethanol Batch Fermentation with Different Initial Glucose Concentration

The effects of different initial glucose concentration on ethanol fermentation by S.cerevisiae GGSF16 were investigated in order to sum up the optimum glucose concentration for ethanol batch fermentation. Through the fitting of ethanol fermentation process by Logistic equation, we obtained the fitting equation and could compare the rates of glucose consumption, yeast growth, and ethanol yield in ethanol fermentation with different initial glucose concentration. The results suggested that, with the increase of initial glucose concentration, the rates of glucose consumption, yeast growth, and ethanol yield reduced and presented the maximum time-lag eventually. As the initial glucose concentration was 286.5 g/L,satisfactory ethanol fermentation effects could be achieved(the final ethanol concentration was up to 133.14 g/L, glucose utilization rate was 99.07 %, and the fermenting efficiency of total sugars reached up to 90.95 %).