DAILLY Wastewater Treatment Plant, Lavey-Morcles, Vaud, Switzerland

DAILLY is a wastewater treatment plant located in Lavey-Morcles, within the canton of Vaud, Switzerland. It serves a small population of 299 residents, reflecting its role in a rural or alpine community. The plant is situated near the Fort de Dailly, a historic site, and operates under Swiss federal water protection regulations. The plant provides secondary treatment, which is the standard biological treatment required under Swiss law for agglomerations of this size. With a designed capacity of 700 m³/day and a current discharge volume of 135.72 m³/day, the facility has ample capacity for future growth. Swiss regulations, aligned with the EU Urban Waste Water Treatment Directive, mandate secondary treatment for all inland plants to protect sensitive water bodies. The treated effluent is discharged into the local watershed, which ultimately drains into the Rhône River via the Rhone basin. The Rhône flows through Lake Geneva and into the Mediterranean Sea, making the plant's operations important for downstream water quality. The surrounding Alpine environment is ecologically sensitive, supporting diverse aquatic life and recreational uses.

The plant discharges into the Rhône River basin, which flows through Lake Geneva and eventually reaches the Mediterranean Sea. This watershed supports diverse aquatic ecosystems, including fish species such as trout and grayling, and is a vital corridor for migratory birds. The Alpine setting means the receiving waters are sensitive to nutrient pollution, which can impact downstream lake and river health.