Table 2. Process performance data from the two-stage PNA bioreactor at steady-state operation.
| pH | COD (mg l−1) | Ammonia (mgN l−1) | Nitrite (mgN l−1) | Nitrate (mgN l−1) | VSS (mg l−1) | Activity (kg NH4-N kg−1 VSS-day) | |
|---|---|---|---|---|---|---|---|
| Filtrate | 8.1 | 535±10.8 | 716.0 | 69.6 | 20.8 | NA | NA |
| PN-effluent | 6.8 | 405±12.2 | 462.0 | 424.8 | 46.2 | NA | NA |
| Anammox-effluent | 6.9 | 350±14.7 | 56.0 | 28.0 | 48.2 | NA | NA |
| Anammox reactor | 6.8-8.0 | NA | NA | NA | NA | 802 | 0.309±0.0094 |
| PN reactor | 6.5-8.5 | NA | NA | NA | NA | 643 | 0.419±0.0265 |
COD, chemical oxygen demand; PN, partial nitritation; VSS, volatile suspended solids.