Lumnezia Lumbrein Wastewater Treatment Plant | Lumnezia, Graubünden, Switzerland

Lumnezia Lumbrein is a secondary wastewater treatment plant located in the municipality of Lumnezia, in the canton of Graubünden, Switzerland. The plant serves a small population of 80 residents, reflecting the rural and alpine character of the region. It operates as part of the municipal wastewater infrastructure for the Lumnezia valley. As a secondary treatment facility, Lumnezia Lumbrein provides biological treatment to remove organic matter and suspended solids. The plant has a designed capacity of 188 m³/day and currently treats 36.31 m³/day, indicating ample reserve capacity. Under Swiss water protection legislation (Gewässerschutzgesetz), small plants like this are required to meet stringent effluent standards to protect sensitive alpine water bodies. The treated wastewater is discharged into the local stream network, which drains into the Glenner River, a tributary of the Rhine. The Rhine ultimately flows into the North Sea. The plant plays a crucial role in preserving water quality in the alpine environment, where ecosystems are sensitive to nutrient pollution.

The plant discharges into a small stream in the Lumnezia valley, part of the Glenner River catchment. The Glenner flows into the Vorderrhein, a headwater of the Rhine River, which travels through Switzerland, Germany, and the Netherlands before reaching the North Sea. The alpine watershed supports diverse aquatic life, including brown trout and other cold-water species, and is sensitive to nutrient enrichment from wastewater.