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Typical concentrations of selected bacteria in raw and treated domestic wastewatera.
| Bacterial group | Raw sewage (cells/ml) | Treated effluent (cells/ml) |
|---|---|---|
| Salmonella | 10−1 – 101 | 10−1 – 101 |
| Total coliforms | 104 – 106 | 103 – 105 |
| Fecal coliforms | 103 – 105 | 102 – 104 |
| Enterococci | 103 – 104 | 101 – 103 |
| Clostridium perfringens | 102 – 103 | 101 – 102 |
Adapted from Medema et al. [131].
