Herisauschwaenberg Wastewater Treatment Plant, Herisau, Switzerland

Herisauschwaenberg is a wastewater treatment plant located in Schwänberg, Herisau, in the canton of Appenzell Ausserrhoden, Switzerland. It serves a small population of 107 people, reflecting its role as a local facility for a rural community. The plant is situated inland, more than 10 km from the coast, and operates within the Swiss regulatory framework for water protection. The plant provides secondary treatment, which is the standard biological treatment required under Swiss water protection legislation for small agglomerations. It has a designed capacity of 250 m³/day and currently discharges an average of 48.57 m³/day, indicating ample capacity for current loads. Swiss regulations mandate that all wastewater treatment plants meet stringent effluent standards to protect receiving water bodies. The treated effluent is discharged into local watercourses that eventually drain into the Rhine basin, which flows into the North Sea. The plant plays a crucial role in protecting the local watershed and downstream aquatic ecosystems from pollution, supporting water quality in the region's streams and rivers.

The plant discharges into local streams that are part of the Rhine drainage basin, ultimately flowing into the North Sea. The surrounding region in Appenzell Ausserrhoden is characterized by hilly terrain and small watercourses that support diverse aquatic life. The plant's secondary treatment helps maintain water quality in these sensitive headwater streams, which are important for local biodiversity and downstream ecosystems.