Table 2.
Wastewater characteristics at the WWTPs studied at the time of sampling
| Treatment plant | Source | Value for wastewater characteristica |
||||||
|---|---|---|---|---|---|---|---|---|
| Temp (°C) | pH | Turbidity (NTU) | SS (mg/liter) | COD (mg/liter) | Mean particle size (μm) | E. coli count (CFU/100 ml) | ||
| Activated sludge | ||||||||
| AS1 | Influent | 13.0 | 7.2 | 80.0 | 163 | 434 | 10.4 | 4 × 106 |
| Effluent | 13.8 | 7.2 | 20.0 | 20.5 | 73.4 | 18.4 | 3 × 105 | |
| AS2 | Influent | 9.9 | 7.2 | 62.5 | 181 | 306 | 10.9 | 5 × 106 |
| Effluent | 10.0 | 7.7 | 9.5 | 11.0 | 46.3 | 13.4 | 5 × 104 | |
| Physicochemical | ||||||||
| PC1 | Influent | 13.0 | 7.6 | 39.5 | 96.0 | 131 | 11.4 | 2 × 106 |
| Effluent | 13.1 | 7.2 | 7.22 | 8.77 | 38.5 | 7.6 | 1 × 105 | |
| PC2 | Influent | 16.7 | 7.8 | 30.5 | 27.3 | 80.6 | 5.4 | 2 × 106 |
| Effluent | 16.0 | 7.4 | 9.5 | 12.0 | 34.9 | 7.1 | 8 × 105 | |
a
SS, suspended solids; COD, chemical oxygen demand; NTU, nephelometric turbidity units.