Table 3 Orthogonal design for NH4 +-N degradation
No. | Inoculum dose (%) | Temperature (°C) | pH value | C/N ratio | Incubation time (h) | Degradation rate (%) |
|---|---|---|---|---|---|---|
1 | 6 | 26 | 6.0 | 5:1 | 44 | 49.7 ± 2.3 |
2 | 6 | 28 | 6.5 | 10:1 | 48 | 50.8 ± 1.9 |
3 | 6 | 30 | 7.0 | 15:1 | 52 | 66.1 ± 1.2 |
4 | 6 | 32 | 7.5 | 20:1 | 56 | 59.4 ± 1.5 |
5 | 8 | 26 | 6.5 | 15:1 | 56 | 51.2 ± 2.2 |
6 | 8 | 28 | 6.0 | 20:1 | 52 | 53.7 ± 2.8 |
7 | 8 | 30 | 7.5 | 5:1 | 48 | 66.8 ± 2.3 |
8 | 8 | 32 | 7.0 | 10:1 | 44 | 51.5 ± 2.0 |
9 | 10 | 32 | 7.0 | 20:1 | 48 | 52.4 ± 1.1 |
10 | 10 | 30 | 7.5 | 15:1 | 44 | 68.6 ± 1.4 |
11 | 10 | 28 | 6.0 | 10:1 | 56 | 65.2 ± 1.6 |
12 | 10 | 26 | 6.5 | 5:1 | 52 | 51.2 ± 2.5 |
13 | 12 | 26 | 7.5 | 10:1 | 52 | 52.1 ± 1.4 |
14 | 12 | 28 | 7.0 | 5:1 | 56 | 51.8 ± 2.8 |
15 | 12 | 30 | 6.5 | 20:1 | 44 | 65.1 ± 2.2 |
16 | 12 | 32 | 6.0 | 15:1 | 48 | 53.1 ± 2.4 |
\(\overline{{k_{1} }}\) | 56.500 | 51.350 | 55.425 | 54.875 | 59.225 | |
\(\overline{{k_{2} }}\) | 55.800 | 55.975 | 55.325 | 54.900 | 55.775 | |
\(\overline{{k_{3} }}\) | 59.100 | 66.550 | 55.450 | 59.500 | 55.775 | |
\(\overline{{k_{4} }}\) | 56.275 | 53.800 | 61.475 | 58.400 | 56.900 | |
Range | 3.300 | 15.200 | 6.150 | 4.625 | 3.450 |