Table 1 The response surface experimental design used in the studies
Run | Pattern | Substrate OR Ca(OH)2 concentration (%) | Treatment residence time (min) |
|---|---|---|---|
1 | −− | 10 | 30 |
2 | −+ | 10 | 120 |
3 | a0 | 10 | 75 |
4 | 0a | 15 | 30 |
5 | ++ | 20 | 120 |
6 | A0 | 20 | 75 |
7 | 0A | 15 | 120 |
8 | 00 | 15 | 75 |
9 | +− | 20 | 30 |
10 | 00 | 15 | 75 |