Runoff water from small treatment plants
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In Europe, the quality of water discharged from small treatment plants is governed in 91/271/EEC directive.
| Class | CSB mg/l | BSB5 mg/l | NH4-N mg/l | Nanorg. mg/l | P mg/l | Faecal coliforme Keime je 1000 ml | AFS mg/l |
|---|---|---|---|---|---|---|---|
| C | 150*/100*** | 40*/25** | - | - | - | - | 75* |
| N | 90*/75*** | 20*/15** | 10** | - | - | - | 50* |
| D | 90*/75*** | 20*/15** | 10** | 25** | - | - | 50* |
* obtained from certified sample, ordinary sample of faecal coliform bacteria
** ** determined from 24 h mixed sample; NH4-N and Nanorg.. with temperature of discharged water T ≥ 12°C
Most modern water treatment plants have improved over BOD5 discharge values of < 25 mg/l.
