CHATONNAYE Wastewater Treatment Plant, Châtonnaye, Fribourg, Switzerland

CHATONNAYE is a municipal wastewater treatment plant located in Châtonnaye, a village in the District de la Glâne, Canton of Fribourg, Switzerland. The plant serves a population of 798 and operates as a secondary treatment facility, handling an average daily flow of 362.23 m³ against a designed capacity of 1,333 m³. As a secondary treatment plant, CHATONNAYE meets the standard requirements under Swiss water protection legislation, which aligns with the EU Urban Waste Water Treatment Directive for agglomerations of this size. The plant's capacity utilization is moderate, indicating adequate headroom for current loads. The treated effluent from CHATONNAYE is discharged into the local water system, which drains via the Glâne River into the Saane/Sarine River, a tributary of the Aare River, ultimately reaching the Rhine River and the North Sea. The plant plays a key role in protecting the Glâne River's water quality, supporting aquatic life and downstream ecosystems.

The plant discharges into the Glâne River basin, which flows into the Saane/Sarine River, part of the Aare-Rhine system draining to the North Sea. The local watershed supports diverse aquatic habitats and is used for agriculture and recreation. Secondary treatment helps reduce organic load and nutrients, protecting downstream water quality in this ecologically sensitive region.