Davos Gadenstatt Wastewater Treatment Plant, Davos, Graubünden

Davos Gadenstatt is a wastewater treatment plant located in the municipality of Davos, in the canton of Graubünden, Switzerland. It serves a population of around 29,384, making it a medium-sized agglomeration in the Swiss Alps. The plant is situated in the Landwasser valley, a key alpine region known for its tourism and winter sports. As a Swiss plant, Davos Gadenstatt operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates stringent treatment standards to protect sensitive alpine water bodies. For agglomerations of this size, secondary treatment with nutrient removal is typically required, especially in areas where receiving waters are sensitive to eutrophication. The plant's treatment process ensures compliance with national limits for organic matter, nitrogen, and phosphorus. The treated effluent is discharged into the Landwasser River, which flows through the Davos valley and eventually joins the Albula River, a tributary of the Rhine. The Rhine ultimately drains into the North Sea. The alpine watershed is ecologically sensitive, supporting diverse aquatic life and providing drinking water for downstream communities. The plant plays a crucial role in maintaining water quality in this high-altitude environment.

The treated wastewater from Davos Gadenstatt is discharged into the Landwasser River, a headwater stream of the Rhine basin. The Landwasser flows through the Davos valley and joins the Albula River, which feeds into the Rhine and eventually the North Sea. This alpine watershed is ecologically sensitive, supporting cold-water fish species like brown trout and serving as a critical water source for downstream ecosystems. The plant's nutrient removal helps prevent eutrophication in the Rhine delta and coastal North Sea.