Table 2 Comparison of cell growth and the yield of acetone, butanol and ethanol using different ORP controlling strategies
ORP value | Starting time for controlling | Fermentation time (h) | End product formed (g/L) | Final Biomass (g/L) | Sugar consumed (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Ethanol | Acetate | Butanol | Butyrate | Acetone | glucose | xylose | cellobiose | ||||
Uncontrolled | 96 h | 4.2 | 7.2 | 7.6 | 4.1 | 2.4 | 3.1 | 94.3 | 80.2 | 81.5 | |
− 250 | 0 h | 96 h | 1.6 | 2.7 | 3.2 | 2.9 | 0.9 | 1.7 | 40.3 | 30.6 | 34.1 |
− 300 | 0 h | 96 h | 2.4 | 3.7 | 4.1 | 2.7 | 1.4 | 2.2 | 74.9 | 50.3 | 50.4 |
− 350 | 0 h | 96 h | 2.2 | 4.1 | 3.2 | 3.1 | 2.6 | 2.5 | 84.1 | 64.3 | 55.8 |
− 400 | 0 h | 96 h | 0.9 | 1.9 | 2.6 | 1.7 | 1.1 | 1.8 | 31.4 | 26.4 | 22.1 |
− 250 | 24 h | 96 h | 3.1 | 5.0 | 4.4 | 4.9 | 2.8 | 2.8 | 87.4 | 80.7 | 79.7 |
− 275 | 24 h | 90 h | 5.1 | 5.4 | 7.6 | 3.7 | 2.6 | 3.4 | 96.4 | 84.4 | 80.6 |
− 300 | 24 h | 90 h | 5.6 | 4.2 | 8.8 | 3.5 | 3.1 | 3.8 | 97.2 | 84.2 | 82.1 |
− 350 | 24 h | 90 h | 5.9 | 3.9 | 10.2 | 2.7 | 2.0 | 4.6 | 98.7 | 86.5 | 88.1 |
− 400 | 24 h | 96 h | 1.7 | 3.1 | 3.7 | 2.3 | 0.4 | 2.9 | 86.4 | 76.4 | 70.4 |