Table 1.
Factors and levels for RSD.
| Factors | Levels | ||
|---|---|---|---|
| −1 | 0 | 1 | |
| Solid-liquid ratio (X1) | 30 | 40 | 50 |
| pH (X2) | 8 | 9 | 10 |
| Temperature (X3) | 70 | 80 | 90 |
| Time (X4) | 8 | 9 | 10 |
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