OLLON Wastewater Treatment Plant, Saint-Triphon, Vaud, Switzerland

The OLLON wastewater treatment plant is located in Saint-Triphon, a locality within the municipality of Ollon in the canton of Vaud, Switzerland. The plant serves a population of approximately 6,440 people, reflecting its role in managing municipal wastewater for this Alpine community. As a facility in the Rhône basin, it contributes to the region's water management infrastructure. Switzerland's wastewater treatment plants operate under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates secondary treatment for all agglomerations and tertiary treatment in sensitive areas. For a plant serving around 6,440 people, typical treatment includes biological processes with nutrient removal to protect receiving waters. The plant's designed capacity is 1.00 volume unit, indicating its scale relative to the population served. The treated effluent from OLLON ultimately flows into the Rhône River via local tributaries, eventually reaching the Mediterranean Sea. The Rhône basin supports diverse aquatic life and is an important ecological corridor in the Alpine region. The plant's operation helps maintain water quality in this sensitive watershed, which is subject to strict Swiss environmental standards.

The OLLON plant discharges into the local catchment of the Rhône River basin, which drains through Lake Geneva (Lac Léman) and the Rhône River to the Mediterranean Sea. This watershed supports diverse aquatic ecosystems, including fish species such as brown trout and grayling, and is an important migratory corridor for birds. The plant's location within 50 km of the coast means its effluent ultimately reaches marine environments, requiring effective treatment to prevent nutrient enrichment.