Table 3 PB experimental design and results with the COD removal as the response variable
Independent variables | Response | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Run | X1 (°C) | X 2 | X | X3 (% v/v) | X4 (rpm) | X | X5 (mg/L) | X6 (g/L) | X | X7 (mg/L) | X8 (mg/L) | COD removal (%) |
1 | 20 | 9 | 1 | 6 | 100 | − 1 | 10,350 | 0 | − 1 | 0 | 0 | 56.50 |
2 | 30 | 9 | − 1 | 6 | 150 | 1 | 10,350 | 1.0 | − 1 | 0 | 2.0 | 73.01 |
3 | 20 | 6 | − 1 | 2 | 100 | − 1 | 10,350 | 1.0 | − 1 | 0.3 | 2.0 | 55.18 |
4 | 20 | 9 | 1 | 2 | 150 | 1 | 19,020 | 1.0 | − 1 | 0.3 | 0 | 41.80 |
5 | 30 | 6 | − 1 | 2 | 150 | − 1 | 19,020 | 0 | − 1 | 0 | 0 | 70.08 |
6 | 20 | 6 | − 1 | 6 | 100 | 1 | 19,020 | 1.0 | 1 | 0 | 0 | 89.36 |
7 | 30 | 6 | 1 | 6 | 150 | − 1 | 10,350 | 1.0 | 1 | 0.3 | 0 | 81.38 |
8 | 30 | 9 | 1 | 2 | 100 | − 1 | 19,020 | 1.0 | 1 | 0 | 2.0 | 67.10 |
9 | 20 | 9 | − 1 | 6 | 150 | − 1 | 19,020 | 0 | 1 | 0.3 | 2.0 | 47.94 |
10 | 30 | 9 | − 1 | 2 | 100 | 1 | 10,350 | 0 | 1 | 0.3 | 0 | 57.80 |
11 | 20 | 6 | 1 | 2 | 150 | 1 | 10,350 | 0 | 1 | 0 | 2.0 | 39.02 |
12 | 30 | 6 | 1 | 6 | 100 | 1 | 19,020 | 0 | − 1 | 0.3 | 2.0 | 87.71 |