Table 1 Fermentation parameters for continuous ethanol fermentations by S. cerevisiae at steady state with the LG medium and process oscillation with the VHG medium
Parameter | Steady state with the LG medium | Process oscillation with the VHG medium | ||
|---|---|---|---|---|
Peak/Trough | Amplitude | Average* | ||
Biomass, g(DCW)/L | 11.7 | 7.1/2.2 | 4.9 | 4.3 |
Cell viability, % | 98.1 | 96.2/48.5 | 47.7 | 77.8 |
Residual glucose, g/L | 0.1 | 179.7/92.6 | 87.1 | 131.7 |
Ethanol, g/L | 53.5 | 71.3/31.4 | 39.9 | 55.2 |
Glycerol, g/L | 0.05 | 14.5/8.9 | 5.6 | 11.5 |
Glucose uptake, g/L/h | 3.24 | 5.06/2.72 | 2.39 | 4.00 |
Ethanol productivity, g/L/h | 1.44 | 1.93/0.85 | 1.08 | 1.49 |
Ethanol yield | 0.45 | 0.71/0.17 | 0.54 | 0.37 |
R glucose , g/g(DCW)/h | 0.28 | 1.36/0.69 | 0.67 | 0.96 |
R ethanol , g/g(DCW)/h | 0.12 | 0.47/0.19 | 0.28 | 0.34 |