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| Time | Removal efficiency of NH4+-N (%) | ||||
|---|---|---|---|---|---|
| C/N 5 | C/N 10 | C/N 20 | C/N 40 | P-value | |
| 12h | 50±1.48b | 68±1.23a | 64±1.54 a | 64±0.42 a | <0.001 |
| 24h | 56±0.24d | 93±0.15c | 94±0.05b | 100±0.01a | <0.001 |
a, b, c, d means within the same line with different superscripts are significantly different (P<0.05).
