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Experimental design.
| Treatment | Natural variables |
Coded variables |
||
|---|---|---|---|---|
| pH | H2O2 dosage (g L−1) | X1 | X2 | |
| T1 | 3.27 | 25.56 | 1 | 1 |
| T2 | 4.40 | 0.019 | −1 | 1 |
| T3 | 4.40 | 174.45 | −1 | 1 |
| T4 | 3.27 | 148.91 | 1 | 1 |
| T5 | 3.00 | 40.67 | 0 | 0 |
| T6 | 5.53 | 148.91 | 1 | 1 |
| T7 | 5.53 | 25.56 | 1 | 1 |
| T8 | 6.00 | 87.24 | −1 | 1 |
| T9 | 2.80 | 87.24 | −1 | 1 |
| T10 | No pH control | No dosage control | – | – |
| T11 | No pH control | No dosage control | – | – |
