KILLWANGEN Wastewater Treatment Plant, Killwangen, Aargau, Switzerland

KILLWANGEN is a municipal wastewater treatment plant located in Killwangen, a village in the Baden district of Aargau canton, Switzerland. The plant serves a population of about 18,633, placing it in the medium agglomeration category under Swiss water protection legislation. Switzerland enforces strict wastewater treatment standards under the Waters Protection Act (Gewässerschutzgesetz), which requires secondary treatment for all discharges into surface waters. Plants serving populations over 10,000 typically include nutrient removal to protect sensitive water bodies. The plant is expected to meet these national standards. The treated effluent from KILLWANGEN ultimately flows into the Limmat River, which drains into the Aare River, then into the Rhine, and finally into the North Sea. The plant plays a key role in protecting the local aquatic ecosystem and downstream water quality in the Rhine basin.

KILLWANGEN discharges into the Limmat River, a tributary of the Aare River, which flows into the Rhine. The Rhine basin supports diverse aquatic life and is a major European waterway. The plant's location in the Swiss Plateau means its effluent contributes to the water quality of downstream lakes and rivers, including the ecologically sensitive Rhine ecosystem. Effective treatment is essential to prevent nutrient enrichment and protect biodiversity in these waters.