Table 2 The CCD experimental conditions and corresponding AN removal rates.
From: Optimization pilot scale study on ammonia nitrogen removal by bio filter
Run | Type | Uncoded Level | AN removal rate (%) | ||
---|---|---|---|---|---|
C/N X1 | pH X2 | HL (d−1) X3 | |||
1 | Star | 15 | 7 | 0.5 | 65.30 |
2 | Star | 25 | 7 | 0.5 | 59.45 |
3 | Star | 15 | 8 | 0.5 | 80.35 |
4 | Star | 25 | 8 | 0.5 | 69.21 |
5 | Star | 15 | 7 | 1.5 | 57.35 |
6 | Star | 25 | 7 | 1.5 | 58.58 |
7 | Star | 15 | 8 | 1.5 | 76.89 |
8 | Star | 25 | 8 | 1.5 | 76.08 |
9 | Axial | 11.59 | 7.5 | 1 | 73.15 |
10 | Axial | 28.41 | 7.5 | 1 | 56.84 |
11 | Axial | 20 | 6.66 | 1 | 51.35 |
12 | Axial | 20 | 8.34 | 1 | 82.15 |
13 | Axial | 20 | 7.5 | 0.16 | 69.97 |
14 | Axial | 20 | 7.5 | 1.84 | 77.33 |
15 | Center | 20 | 7.5 | 1 | 87.05 |
16 | Center | 20 | 7.5 | 1 | 89.83 |
17 | Center | 20 | 7.5 | 1 | 89.50 |
18 | Center | 20 | 7.5 | 1 | 92.09 |
19 | Center | 20 | 7.5 | 1 | 88.28 |
20 | Center | 20 | 7.5 | 1 | 88.78 |