Table 6.
Factor levels of independent variables.
| Factors | Coded Values | ||
|---|---|---|---|
| −1 | 0 | +1 | |
| Actual Values | |||
| Treatment time [min] | 10 | 20 | 30 |
| Liquid-to-solid ratio [mL/g] | 10 | 20 | 30 |
| Treatment temperature [°C] | 40 | 55 | 70 |
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