In operation since: 2009
Type of wastewater treated : Domestic
Hydraulic load: 188 m3/d
Organic load (PE): 900 PE
Location : Saint Germain sur Ille, Bretagne – France
Client : Town of Saint Germain sur Ille
Stage 1 type : Vertical flow reed bed system (French system)
Stage 1 surface area (m²): 1390
Stage 2 type: Horizontal flow, saturated
Stage 2 surface area (m²): 1,000 m²
Stage 3 type: Vertical flow, unsaturated
Stage 3 surface area (m²): 900 m²
Stage 4 type: pond
Stage 4 surface area (m²): 1,000 m²
Stage 5 type: Phosphorus precipitation
Cost : 450,000.00 €
Designed by SINBIO
A series of five waste stabilization ponds was present in Saint Germain sur l’Ille. With an increase of population and higher discharge standards (phosphorus and nitrogen), it was required to improve the treatment capacity while using the same land. Maintaining an extensive treatment system was a proposal from SINBIO.
Three stage reed beds filters (vertical and horizontal), fed by pumping and gravity, followed by a pond fed by gravity. There is no primary treatment; the raw, only coarse screened sewage is fed directly on the first stage beds with storage of the filtered dried and mineralized solids on the surface of the beds for at least 10 years.
The added reed bed filters allowed for boosting of treatment capacity and increasing of treatment efficiency with limited construction and low cost.