Table 2.
Analysis of variance for the quadratic model (EFV)
| Source | Sum of squares | DF | Mean square | F-value | P-value |
|---|---|---|---|---|---|
| Model | 5375.75 | 7 | 767.96 | 13.25 | < 0.0001 |
| A—adsorbent loading | 168.01 | 1 | 168.01 | 2.9 | 0.1124 |
| B—temperature | 410.67 | 1 | 410.67 | 7.09 | 0.0196 |
| C—pH | 0.1389 | 1 | 0.1389 | 0.0024 | 0.9617 |
| D—pollutant concentration | 3298.93 | 1 | 3298.93 | 56.92 | < 0.0001 |
| AC | 646.05 | 1 | 646.05 | 11.15 | 0.0053 |
| BD | 203.68 | 1 | 203.68 | 3.51 | 0.0084 |
| D2 | 1011.59 | 1 | 1011.59 | 17.45 | 0.0011 |
| Residual | 753.45 | 13 | 57.96 | ||
| Lack of fit | 17.05 | 5 | 3.41 | 0.7056 | 0.6587 |
| Pure error | 14.5 | 3 | 4.83 | ||
| Cor total | 6129.2 | 20 |