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Wastewater source, pollutant and its initial concentration in each phase
| Wastewater source | COD influent (mg/L) | NH4+-N influent (mg/L) | HS− Influent (mg/L) | |
|---|---|---|---|---|
| Stage I | Synthetic | 252 ± 48 | 38 ± 5.6 | – |
| Stage II | Synthetic | 392 ± 66 | 156 ± 8.7 | – |
| Stage III | Synthetic | 418 ± 59 | 150 ± 12 | 48 ± 5 |
| Stage IV | Industrial | 443 ± 25 | 74 ± 3.0 | 24 ± 3 |
