Research Article
Alkali Pretreatment and Enzymatic Hydrolysis of Australian Timber Mill Sawdust for Biofuel Production
Table 1
Composition of sawdust before and after pretreatment with NaOH.
| | Dose | Temp. (°C) | Time (hr) | Cellulose (%) w/w | Xylan (%) w/w | Galactans (%) w/w | ASL (%) w/w | AIL (%) w/w | Extractives (%) w/w |
| | Untreated sawdust | 41.0 ± 2.8 | 6.0 ± 3.0 | 1.1 ± 1.5 | 5.7 ± 0.3 | 25.5 ± 4.2 | 8.05% |
| | 3% | 60 | 0.5 | 39.9 ± 1.4 | 4.76 ± 0.4 | 0.5 ± 0.2 | 4.9 ± 0.6 | 26.5 ± 1 | 0.96% | | | 1 | 44.6 ± 1 | 4.76 ± 0.7 | 0.3 ± 0.4 | 4.7 ± 0.4 | 31.7 ± 0.3 | 1.16% | | | 2 | 48.3 ± 7.3 | 4.18 ± 0.3 | 1.3 ± 0.8 | 4.7 ± 0.7 | 31.8 ± 0.8 | 0.75% |
| | 7% | | 0.5 | 45.2 ± 3.9 | 4.08 ± 0.1 | 0.9 ± 0.9 | 4.1 ± 0.3 | 28.2 ± 4.9 | 0.52% | | | 1 | 47.8 ± 7.4 | 3.81 ± 0.1 | 0.3 ± 0.1 | 4.0 ± 0.1 | 29.6 ± 0.8 | 0.69% | | | 2 | 50.9 ± 6.0 | 4.5 ± 1.0 | 0.3 ± 0.0 | 3.8 ± 0.4 | 28.8 ± 4.3 | 0.87% |
| | 10% | | 0.5 | 51.7 ± 3.6 | 6.4 ± 2.1 | 1.4 ± 1.2 | 4.3 ± 0.4 | 26.9 ± 3.2 | 0.72% | | | 1 | 48.3 ± 0.8 | 5.9 ± 0.9 | 0.5 ± 0.1 | 3.8 ± 0.1 | 27.7 ± 5.3 | 0.87% | | | 2 | 48.1 ± 4.0 | 4.9 ± 0.4 | 0.3 ± 0.1 | 4.5 ± 0.2 | 31.7 ± 0.6 | 0.85% |
| | 7% | −20 | 24 | 51.0 ± 2.0 | 4.3 ± 0.7 | 0.4 ± 0.0 | 4.4 ± 0.2 | 24.0 ± 2.7 | 0.59% | | −20 | 2 | 49.5 ± 4.9 | 4.7 ± 1.2 | 0.4 ± 0.3 | 4.4 ± 0.1 | 26.8 ± 1.2 | 0.72% | | 121 | 0.5 | 51.8 ± 3.5 | 4.4 ± 1.0 | 0.0 ± 0.1 | 3.8 ± 0.2 | 23.1 ± 2.6 | 0.51% |
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ALS represents acid soluble lignin. AIL represents acid insoluble lignin.
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