Domestic wastewater
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Plougonvelin | 29 | France
Capacity in IE : 14 000
Year of construction : 2003
Project owner : SIVU Plougonvelin, Trébabu, Le Conquet
Consultant : D.D.E.
Water treatment
- Aeration basin 2815 m³ with 2 cells (1 working in winter, 2 in summer)
- 2 surface aerators 55 kW
- Deaerator
- Scraper settling tank Ø 23 m
- Storage and treatment of centrates from centrifugation
Sludge treatment
- Sludge recirculation
- Sludge thickener 70 m³
- Sludge storage tank 350 m³
- Mobile centrifuge decanter
Plougonvelin | 29 | FranceCapacity in IE : 14 000
Year of construction : 2003
Project owner : SIVU Plougonvelin, Trébabu, Le Conquet
Consultant : D.D.E.
TYPE OF TREATMENT
Water treatment- Aeration basin 2815 m³ with 2 cells (1 working in winter, 2 in summer)
- 2 surface aerators 55 kW
- Deaerator
- Scraper settling tank Ø 23 m
- Storage and treatment of centrates from centrifugation
Sludge treatment- Sludge recirculation
- Sludge thickener 70 m³
- Sludge storage tank 350 m³
- Mobile centrifuge decanter
TECHNICAL DATA OF PLANT
| Capacity of treatment | Treated water discharge standards | |
| Capacity of treatment | 14 000 IE | |
| Daily volume | 2 300 m³/d | |
| Peak flow | 230 m³/h |
| Biological oxygen demand (BOD5) | 840 kg/d | 25 mg/l |
| Chemical oxygen demand (COD) | 1 680 kg/d | 90 mg/l |
| Suspended solids | 1 260 kg/d | 25 mg/l |
| Total Kjeldahl nitrogen | 210 kg/d | 10 mg/l |
| Total nitrogen | 210 kg/d | 15 mg/l |
| Total phosphorus | 56 kg/d |
The Inhabitant Equivalent (IE) is a notion used in sanitation to evaluate the size of waste water treatment plants, it corresponds to an estimate of pollution caused by the "inhabitant equivalent" defined thus :
- 60 g/inhabitant/day for DBO5
- 90 g/inhabitant/day for suspended matter
- 15 g/inhabitant/day for total nitrogen
- 4 g/inhabitant/day for total phosphor
