Table 2 The performance of enzymatic hydrolysis and ABE fermentations using JAS hydrolysate pretreated by different NaOH–H2O2 concentrations
|  | 2%NaOH | 4%NaOH–H2O2 (3%, v/v) | 2%NaOH–H2O2 (3%, v/v) | 2%NaOH–H2O2 (6%, v/v) | 2%NaOH–H2O2 (9%, v/v) |
|---|---|---|---|---|---|
Initial glucose, g/L | 36.5 | 41.6 | 40.3 | 48.3 | 45.4 |
Initial xylose, g/L | 9.2 | 11.0 | 10.5 | 11.6 | 11.1 |
Initial Cellobiose, g/L | 3.9 | 3.5 | 5.0 | 4.2 | 5.6 |
Initial Arabinose, g/L | 2.4 | 2.3 | 2.5 | 2.0 | 2.1 |
Residual glucose, g/L | 3.3 | 3.5 | 6.0 | 11.1 | 7.3 |
Residual xylose, g/L | 2.0 | 1.2 | 2.6 | 2.7 | 2.5 |
Maximum OD | 2.1 | 2.5 | 2.4 | 2.6 | 2.2 |
Fermentation time, h | 60 | 60 | 60 | 60 | 60 |
Acetone, g/L | 5.8 | 5.3 | 4.9 | 6.0 | 5.2 |
Ethanol, g/L | 0.14 | 0.14 | 0.13 | 0.16 | 0.15 |
Butanol, g/L | 9.0 | 10.2 | 9.7 | 11.0 | 10.5 |
Total ABE, g/L | 14.7 | 15.5 | 14.4 | 17.0 | 16.3 |
Butanol yield, g/g | 0.22 | 0.22 | 0.23 | 0.24 | 0.23 |