Table 2.
Experimental and predicted responses obtained from the BBD. The predicted outputs were calculated using model Eq. (9).
| Run No | Coded value | Actual value | Response | |||||
|---|---|---|---|---|---|---|---|---|
| A | B | C | A | B | C | Pb removal (%) | ||
| Yexp | Ypre | |||||||
| 1 | 1 | 1 | 0 | 8 | 40 | 1 | 83.71 | 82.88 |
| 2 | 1 | 0 | − 1 | 8 | 30 | 0.5 | 79.71 | 81.83 |
| 3 | 0 | 0 | 0 | 6 | 30 | 1 | 94.76 | 94.65 |
| 4 | 1 | − 1 | 0 | 8 | 20 | 1 | 90.39 | 89.05 |
| 5 | 0 | 1 | 1 | 6 | 40 | 1.5 | 93.25 | 94.03 |
| 6 | 0 | − 1 | − 1 | 6 | 20 | 0.5 | 84.70 | 83.91 |
| 7 | − 1 | 0 | 1 | 4 | 30 | 1.5 | 86.23 | 84.11 |
| 8 | 0 | 1 | − 1 | 6 | 40 | 0.5 | 79.41 | 78.13 |
| 9 | 0 | 0 | 0 | 6 | 30 | 1 | 94.81 | 94.65 |
| 10 | 0 | − 1 | 1 | 6 | 20 | 1.5 | 95.67 | 96.96 |
| 11 | 0 | 0 | 0 | 6 | 30 | 1 | 94.39 | 94.65 |
| 12 | − 1 | 1 | 0 | 4 | 40 | 1 | 71.15 | 72.49 |
| 13 | − 1 | − 1 | 0 | 4 | 20 | 1 | 74.20 | 75.04 |
| 14 | − 1 | 0 | − 1 | 4 | 30 | 0.5 | 64.88 | 64.83 |
| 15 | 1 | 0 | 1 | 8 | 30 | 1.5 | 91.46 | 91.51 |