Nufenen Wastewater Treatment Plant: Serving Rheinwald, Graubünden

The Nufenen wastewater treatment plant is located in the village of Nufenen, part of the Rheinwald municipality in the canton of Graubünden, Switzerland. This small-scale facility serves a population of 254 residents, reflecting the rural and alpine character of the region. The plant is situated in the Swiss Alps, an area known for its pristine natural environment and sensitive water bodies. The plant operates with secondary treatment, which is the standard biological treatment level required under Swiss wastewater regulations. Swiss law mandates that all wastewater treatment plants meet secondary treatment standards, with more stringent requirements for larger agglomerations or discharges into sensitive waters. The designed capacity of 594 m³/day indicates the plant is operating well below its capacity, with a current discharge volume of 115.30 m³/day. The treated effluent from the Nufenen plant is discharged into local watercourses that ultimately drain into the Hinterrhein river, a tributary of the Rhine. The Rhine flows through Switzerland, Germany, and the Netherlands before reaching the North Sea. The plant plays a crucial role in protecting the water quality of these alpine streams and the downstream Rhine ecosystem, which supports diverse aquatic life and is an important migratory corridor for fish.

The Nufenen plant discharges into small alpine streams that feed the Hinterrhein river, part of the Rhine basin. The Rhine flows through Switzerland, Germany, and the Netherlands to the North Sea. The surrounding watershed is ecologically sensitive, supporting cold-water fish species and pristine alpine habitats. The plant's secondary treatment helps protect these waters from nutrient pollution and organic matter, maintaining the ecological integrity of the alpine stream network.