MARLYAEGN Wastewater Treatment Plant, Marly, Switzerland

MARLYAEGN is a wastewater treatment plant located in Marly, within the canton of Fribourg/Freiburg, Switzerland. It serves a population of approximately 24,109 people, placing it in the medium agglomeration category. The plant is situated near the Gérine river, a tributary of the Sarine, which flows into the Aare and eventually the Rhine. The plant operates under Switzerland's Water Protection Act (Gewässerschutzgesetz), which mandates appropriate treatment for all wastewater. For agglomerations of this size, secondary treatment with nutrient removal is typically required to protect sensitive water bodies. The designed capacity of 1.00 (likely in m³/s or similar unit) indicates the plant's hydraulic capacity. Treated effluent from MARLYAEGN is discharged into the local watershed, contributing to the Rhine basin. The downstream environment includes the Sarine river, known for its ecological diversity and recreational value. The plant plays a key role in maintaining water quality in this Alpine region, supporting aquatic life and downstream uses.

The plant discharges into the Gérine river, a tributary of the Sarine, which flows into the Aare and ultimately the Rhine River. The Rhine basin is a major European watershed supporting diverse ecosystems and providing drinking water for millions. The local watershed in the Fribourg region is characterized by Alpine and pre-Alpine landscapes, with sensitive aquatic habitats that require protection from nutrient pollution.