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Operational conditions for this study.
| Stage | Time (day) | Influent mode | SRT (day) | HRT (hours) | Internal recycle | External recycle | Mixed liquid recycle | MLSS (mg/L) |
|---|---|---|---|---|---|---|---|---|
| I | 0–30 | Continuous | 13 ± 2 | 14 | 200% | 100% | 100% | 3714 ± 122 |
| II | 31–97 | Discontinuous (cut-off duration = 12 h/day) |
