Table 6 The performance of ABE fermentation with different initial pH of hydrolysate
| Â | Initial pH of the hydrolysate | ||||||
|---|---|---|---|---|---|---|---|
5.8 | 6.0 | 6.2 | 6.4 | 6.6 | 6.8 | 7.0 | |
Initial reducing sugars, g/L | 58.9 | 59.8 | 57.5 | 59 | 58.7 | 58 | 59.7 |
Residual sugars, g/L | 12.6 | 10.3 | 10.4 | 10.0 | 9.5 | 13.2 | 14.4 |
Maximum OD | 2.1 | 2.5 | 2.5 | 2.2 | 2.2 | 2.2 | 2.1 |
Fermentation time, h | 60 | 60 | 60 | 60 | 60 | 60 | 60 |
Acetone, g/L | 5.3 | 5.6 | 5.7 | 5.6 | 5.4 | 5.4 | 5.2 |
Ethanol, g/L | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 |
Butanol, g/L | 9.7 | 10.0 | 11.8 | 11.1 | 10.8 | 10.5 | 10.0 |
Total ABE, g/L | 15.1 | 15.8 | 17.6 | 16.9 | 16.3 | 16.0 | 15.3 |
Butanol yield, g/g | 0.21 | 0.20 | 0.25 | 0.23 | 0.22 | 0.23 | 0.22 |
Butanol productivity, g/L/h | 0.12 | 0.12 | 0.14 | 0.13 | 0.13 | 0.13 | 0.12 |