In operation since: 2005
Type of wastewater treated: Domestic
Hydraulic load: 165 m3/d
Organic load (PE): 1000 PE
Organic design load (kg BOD/day): 66
Location : Orelle, Savoie, FRANCE
Client : Town of Orelle
Stage 1 type : Vertical flow reed bed system (French system)
Stage 1 surface area (m²): 1200
Stage 2 type: Vertical flow, unsaturated
Stage 2 surface area (m²): 800 m²
Cost : 350,000.00 €
Designed by SINT / SINBIO
The project was to create a reed bed filter (2 stages) to treat domestic effluent on an old parking area.
Majors design constraints were:
- High altitude of the project (1000 m) with a long lasting snow cover,
- Limited surface area available.
Two stage reed bed filters, fed by pumping flow with recirculation on 1st stage. There is no primary treatment; the raw, only coarse screened sewage is fed directly on the first stage beds with storage of filtered dried and mineralized solids on the surface of the beds for at least 10 years.
Because of cold temperature, 2nd stage is by-pass during winter to avoid freezing.
This solution allows high quality of treatment of water during summer and winter seasons. Maintenance activity is minimal compared to intensive solutions.