CORSEREY Wastewater Treatment Plant, Prez, Switzerland

The CORSEREY wastewater treatment plant is located in Corserey, part of the municipality of Prez in the canton of Fribourg, Switzerland. It serves a small population of 200 people, reflecting its role in a rural or peri-urban setting. The plant is situated inland, more than 10 km from the coast, but within 50 km of the coast, indicating its position in the Swiss plateau. The plant provides secondary treatment, which is the standard biological treatment required under Swiss regulations for small agglomerations. Swiss wastewater treatment is governed by the Federal Water Protection Act, which mandates appropriate treatment levels based on receiving water sensitivity. The plant has a designed capacity of 467.00 m³/day and currently discharges 90.78 m³/day, indicating ample capacity for future growth. The treated effluent is discharged into local watercourses that ultimately drain into the Rhine River basin, flowing northward to the North Sea. The plant plays a key role in protecting the local aquatic environment, including streams and rivers that support diverse freshwater ecosystems. Its secondary treatment ensures reduction of organic pollutants and nutrients, safeguarding water quality downstream.

The CORSEREY plant discharges into small streams within the Sarine River watershed, which flows into the Aare River and eventually the Rhine. This river system supports diverse aquatic life and is an important ecological corridor in the Swiss plateau. The plant's secondary treatment helps protect these water bodies from organic pollution, contributing to the overall health of the Rhine basin.