Table 1 Experimental levels and factors of CCD.
From: Optimization pilot scale study on ammonia nitrogen removal by bio filter
Coded level | Uncoded level | ||
---|---|---|---|
C/N | pH | HL (d−1) | |
− 1.68 | 11.59 | 6.66 | 0.16 |
− 1 | 15.00 | 7.00 | 0.50 |
0 | 20.00 | 7.50 | 1.00 |
1 | 25.00 | 8.00 | 1.50 |
1.68 | 28.41 | 8.34 | 1.84 |