| Parameter | Stage 1 | Stage 2 | Stage 3 |
|---|---|---|---|
| Time (days) | 1–13 | 14–25 | 26–37 |
| HRTMBR (h) | 24 | 24 | 24 |
| HRTAnoxic (h) | 0 | 10 | 10 |
| SRT (d) | — | 55 | 55 |
| Recycle ratio | — | 200% | 200% |
| DMAC (mg L−1) | 1500–1700 | 800 | 3000 |
| MLSSMBR (mg L−1) | 8558 ± 433 | 11 897.5 ± 922.5 | 15 898.8 ± 303.8 |
| MLVSSMBR (mg L−1) | 5421 ± 24 | 7913.8 ± 1171.3 | 12 496.3 ± 98.8 |
| MLSSAnoxic (mg L−1) | — | 8353.87 ± 46.3 | 8610 |
| MLVSSAnoxic (mg L−1) | — | 5606.3 ± 856.3 | 6627.5 |
| pH | 8.3 ± 0.3 | 7.2 ± 0.3 | 8.6 ± 0.3 |
| DOMBR (mg L−1) | 0.24–5.64 | 0.24–6.14 | 0.25–0.32 |
| DOAnoxic (mg L−1) | — | ≤0.5 | ≤0.5 |
| Air flow rate (L min−1) | 15 | 15 | 15 |
a
HRT: Hydraulic retention time, SRT: sludge retention time, MLSS: mixed liquid suspended solids, MLVSS: mixed liquid volatile suspended solids, DO: dissolved oxygen.