Overview
Trun Zavragia wastewater treatment plant serves the municipality of Trun in Graubünden, Switzerland. It treats wastewater for approximately 4,261 people in the Surselva region.
Trun Zavragia is a wastewater treatment plant located in Trun, within the canton of Graubünden (Grischun/Grigioni), Switzerland. The facility serves a population of around 4,261 residents, placing it in the small-to-medium agglomeration category under Swiss water protection regulations. Switzerland's Water Protection Act (Gewässerschutzgesetz) requires all wastewater treatment plants to meet stringent standards, typically including mechanical and biological treatment with nutrient removal where necessary. For plants of this scale, secondary treatment is standard, and advanced treatment may be required if the receiving water body is sensitive. The plant discharges treated effluent into the local watershed, which drains into the Rhine River via the Vorderrhein. The Rhine is a major European waterway that flows through Switzerland, Germany, and the Netherlands before reaching the North Sea. The plant plays a key role in protecting the water quality of this important river system.
Environmental context
The treated effluent from Trun Zavragia enters the Vorderrhein, a headwater of the Rhine River. The Rhine basin supports diverse aquatic life and is a critical migratory corridor for fish species. Downstream, the river flows through Lake Constance and ultimately reaches the North Sea, making local treatment essential for regional and transboundary water quality.
Frequently asked questions
The plant is located at Via Principala 2, in the village of Zignau, part of the municipality of Trun, in the Surselva district of Graubünden, Switzerland.
The plant serves approximately 4,261 people, representing a small-to-medium agglomeration in the Swiss Alps.
Treated effluent is discharged into the local watercourse, which flows into the Vorderrhein, a headwater of the Rhine River. The Rhine ultimately reaches the North Sea.
The plant operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates secondary treatment for all municipal wastewater. Discharge permits are issued by the cantonal authority of Graubünden.
Swiss regulations require at least secondary (biological) treatment for plants of this size. Depending on the sensitivity of the receiving water, additional nutrient removal may be mandated.
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