Domestic wastewater
Montfort le Gesnois | 72 | FranceCapacity in IE : 4 000
Year of construction : 2004
Project owner : Commune de Montfort le Gesnois
Consultant : IRH / D.D.E.
TYPE OF TREATMENT
Water treatment- Storm water tank 320 m³
- Aeration basin 800 m³
- Air diffusers
- Phosphate removal
- Deaerator
- Scraper settling tank Ø 19,8 m
Sludge treatment- Sludge recirculation
- Sludge thickener
- Gravity belt thickener
- Sludge storage tank 900 m³
TECHNICAL DATA OF PLANT
| Capacity of treatment | Treated water discharge standards | |
| Capacity of treatment | 4 000 IE | |
| Daily volume | 1 250 m³/d | |
| Peak flow | 110 m³/h |
| Biological oxygen demand (BOD5) | 240 kg/d | 25 mg/l |
| Chemical oxygen demand (COD) | 480 kg/d | 90 mg/l |
| Suspended solids | 360 kg/d | 35 mg/l |
| Total nitrogen | 50 kg/d | 15 mg/l |
| Total phosphorus | 8 kg/d | 2 mg/l |
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
