Vullierens Wastewater Treatment Plant, Vaud, Switzerland

The Vullierens wastewater treatment plant is located in the Z.A. Les Chintres area of Vullierens, in the District of Morges, Vaud, Switzerland. It serves a small population of 337 people, reflecting its role as a local facility for this rural community. The plant employs advanced treatment processes, exceeding the minimum secondary treatment requirements under Swiss water protection legislation. With a designed capacity of 788.00 m³/day and a current discharge volume of 152.97 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local watercourses that drain toward Lake Geneva (Lac Léman), a large alpine lake of significant ecological and recreational value. The plant's advanced treatment helps protect the lake's water quality and downstream ecosystems, including the Rhône River, which flows from Lake Geneva into the Mediterranean Sea.

The plant discharges into local streams that flow into the Venoge River, a tributary of Lake Geneva (Lac Léman). Lake Geneva is a large, deep alpine lake that supports diverse aquatic life and serves as a drinking water source for millions. The lake's outflow, the Rhône River, travels through France to the Mediterranean Sea. Advanced treatment at Vullierens helps reduce nutrient loading and protect the lake from eutrophication, preserving its ecological health.