Domestic wastewater
Saint Colomban | 44 | FranceCapacity in IE : 1 900
Capacity in m³ per day : 309
Year of construction : 2007
Project owner : Commune de Saint Colomban
Consultant : D.D.E.
TYPE OF TREATMENT
Water treatment- Storm water tank 110 m³
- Circular aeration basin 400 m³
- 2 surface aerators 9,2 kw
- Deaerator
- Floating matters storage tank
- Scraper settling tank Ø 12 m
- Phosphate removal
Sludge treatment
- Sludge recirculation
- Gravity belt thickener
- Sludge storage tank 510 m³
Smells treatment- Deodorizing of the storm water tank
TECHNICAL DATA OF PLANT
| Capacity of treatment | Treated water discharge standards | |
| Capacity of treatment | 1 900 IE | |
| Daily volume | 309 m³/d | |
| Peak flow | 32 m³/h |
| Biological oxygen demand (BOD5) | 114 kg/d | 25 mg/l |
| Chemical oxygen demand (COD) | 256 kg/d | 90 mg/l |
| Suspended solids | 133 kg/d | 30 mg/l |
| Total Kjeldahl nitrogen | 28,5 kg/d | |
| Total nitrogen | 15 mg/l | |
| Total phosphorus | 7,6 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
