| Aeration rates (Lair/min) | Effluent concentrations (mg/L) | Nitrification efficiency (%) | Nitritation rate (%) | Denitrification rate (%) | ||
| NH4-N | NO2-N | NO3-N | ||||
| 3 | 321.6 | 127.9 | 2.7 | 5.7 | 97.9 | 9.5 |
| 6 | 183.8 | 228.4 | 2.2 | 63.0 | 98.9 | 17.1 |
| 9 | 3.4 | 279.4 | 2.6 | 99.1 | 99.0 | 25.9 |
| 12 | 3.4 | 319.1 | 3.5 | 99.3 | 98.9 | 34.7 |
| 15 | lower than the detection limit | 319.2 | 5.4 | 100.0 | 98.3 | 35.1 |