Table 8.
Analysis of the CCD experiment using Statistica 13–verification of the adequacy of the model using ANOVA.
| Parameter | Evaluation of Effects, COD, g O2/L, R2 = 0.7565, R2adj = 0.5941, 3 Parameter, 1 Block, 16 Experiments, MS = 3.4812 |
|||
|---|---|---|---|---|
| SS | MS | F | P * | |
| pH (L) | 14.5408 | 14.5408 | 4.1769 | 0.0713 |
| pH (Q) | 14.3335 | 14.3335 | 4.1173 | 0.0730 |
| K2FeO4 (L) | 38.0320 | 38.0320 | 10.9249 | 0.0092 |
| K2FeO4 (Q) | 0.5305 | 0.5305 | 0.1524 | 0.7054 |
| Time (L) | 17.6422 | 17.6422 | 5.0678 | 0.0509 |
| Time (Q) | 1.5766 | 1.5766 | 0.4529 | 0.5179 |
| Error | 31.3312 | 3.4812 | - | - |
L—linear effect, Q—quadratic effect, SS—predicted residual error of sum of squares, MS—mean square error, F—statistics, * statistically significant if p < 0.05.