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La Haye Pesnel | 50 | France
Capacity in IE : 3 500
Year of construction : 2009
Project owner : SIVU de Plotin
Consultant : Bourgois
Water treatment
- Storm water tank 280 m³
- Anaerobic tank 110 m³
- Circular aeration basin 720 m³
- Air diffusers
- Deaerator
- Scraper settling tank Ø 13 m
- Polishing treatment by a ditch with purifying plants
Sludge treatment
- Sludge recirculation
- Gravity belt thickener
- Sludge storage tank 560 m³
- 2 existing sludge storage tank 180 m³
Smells treatment
- Deodorizing of the sludge storage tank and of the lifting station
La Haye Pesnel | 50 | FranceCapacity in IE : 3 500
Year of construction : 2009
Project owner : SIVU de Plotin
Consultant : Bourgois
TYPE OF TREATMENT
Water treatment- Storm water tank 280 m³
- Anaerobic tank 110 m³
- Circular aeration basin 720 m³
- Air diffusers
- Deaerator
- Scraper settling tank Ø 13 m
- Polishing treatment by a ditch with purifying plants
Sludge treatment
- Sludge recirculation
- Gravity belt thickener
- Sludge storage tank 560 m³
- 2 existing sludge storage tank 180 m³
Smells treatment- Deodorizing of the sludge storage tank and of the lifting station
TECHNICAL DATA OF PLANT
| Capacity of treatment | Treated water discharge standards | |
| Capacity of treatment | 3 500 IE | |
| Daily volume | 850 m³/d | |
| Peak flow | 60 m³/h |
| Biological oxygen demand (BOD5) | 210 kg/d | 20 mg/l |
| Chemical oxygen demand (COD) | 525 kg/d | 80 mg/l |
| Suspended solids | 315 kg/d | 20 mg/l |
| Total Kjeldahl nitrogen | 52,5 kg/d | 10 mg/l |
| Total phosphorus | 14 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
