WALDSTATTAUELI Wastewater Treatment Plant, Waldstatt, Switzerland

WALDSTATTAUELI is a wastewater treatment plant located in Waldstatt, a municipality in the canton of Appenzell Ausserrhoden, Switzerland. The plant serves a population of approximately 2,733 people, placing it in the small agglomeration category. It is situated in the hilly pre-Alpine region of northeastern Switzerland, an area characterized by dispersed settlements and agricultural land use. As a Swiss plant, WALDSTATTAUELI operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates stringent treatment standards for all wastewater discharges. For small agglomerations like this, secondary treatment with nutrient removal is typically required to protect sensitive receiving waters. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day or similar unit), indicating a modest infrastructure footprint appropriate for the community size. The treated effluent from WALDSTATTAUELI ultimately discharges into the local hydrological network, which drains into the Sitter River, a tributary of the Thur River, and eventually into the Rhine River. The Rhine flows through Switzerland, Germany, and the Netherlands before reaching the North Sea. The plant plays a crucial role in maintaining water quality in this alpine watershed, which supports diverse aquatic life and provides drinking water for downstream communities.

WALDSTATTAUELI discharges into the Sitter River catchment, which flows into the Thur River and then the Rhine River, ultimately reaching the North Sea. The local watershed is ecologically sensitive, supporting cold-water fish species such as brown trout and providing habitat for macroinvertebrates. The pre-Alpine terrain means streams have high oxygen levels and low natural nutrient loads, so even small nutrient inputs from wastewater can affect downstream ecosystems. The plant's treatment helps protect the Rhine basin from eutrophication.