Saint Germain sur Ille

Saint Germain sur Ille : a 500 PE waste stabilization pond boosted to 900 PE by addition of reed bed filters with high standards for phosphorus and total nitrogen removal.

Additional Info

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.


Additional Info

  • Hydraulic load: m³/day
  • Organic load (PE): PE
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