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Ranges and levels of experimental parameters. The coded values for each parameter are − 1, 0, or + 1 and the corresponding actual values are documented.
| Parameter | Symbol | Range and level | ||
|---|---|---|---|---|
| − 1 | 0 | + 1 | ||
| pH | A | 4 | 6 | 8 |
| Temperature (oC) | B | 20 | 30 | 40 |
| Biomass dose (g/L) | C | 0.5 | 1.0 | 1.5 |
