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Range and levels of parameters in Box-Behnken experimental design.
| Factors | Parameters | Coded Levels | ||
|---|---|---|---|---|
| −1 | 0 | 1 | ||
| A | CaCl2 concentration [mol/dm3] | 0.05 | 0.15 | 0.25 |
| B | Rhamnolipids concentration [log c] | 3.64 | 4.64 | 5.64 |
| C | Ion cross-linking time [h] | 12 | 24 | 36 |
