Overview
KOELLIKEN wastewater treatment plant serves the municipality of Kölliken in Aargau, Switzerland. It treats wastewater for approximately 18,125 people under Swiss federal water protection regulations.
KOELLIKEN is a wastewater treatment plant located in Kölliken, a municipality in the canton of Aargau, Switzerland. The plant serves a population of about 18,125 residents, placing it in the medium-sized agglomeration category for Swiss wastewater infrastructure. Switzerland's water protection legislation, particularly the Waters Protection Act (GSchG), mandates stringent treatment standards for all wastewater plants. Plants serving populations over 10,000 are typically required to implement nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. It operates under these national regulations. The treated effluent from KOELLIKEN is discharged into local watercourses that eventually drain into the Rhine River basin. The Rhine is a major European waterway, and Swiss plants in this basin must meet high standards to prevent eutrophication and protect downstream ecosystems, including the North Sea.
Environmental context
KOELLIKEN discharges into the local catchment of the Aare River, a major tributary of the Rhine. The Rhine flows through several countries before reaching the North Sea, making water quality management critical for transboundary ecological health. The Aare-Rhine system supports diverse aquatic life, including salmonid fish species, and is an important migratory corridor. Swiss regulations require advanced treatment to minimize nutrient loading, which helps prevent algal blooms and oxygen depletion in downstream waters.
Frequently asked questions
KOELLIKEN is located in Kölliken, a municipality in the canton of Aargau, Switzerland. The plant's address is Kläranlage Kölliken, 20, Kanalweg, Kölliken, Bezirk Zofingen, Aargau, 5742.
The treated effluent from KOELLIKEN is discharged into local watercourses that flow into the Aare River, a major tributary of the Rhine. The plant operates under Swiss regulations that require advanced treatment to protect water quality in the Rhine basin.
KOELLIKEN helps protect the Aare River and the broader Rhine River basin. The Rhine is a critical European waterway that supports diverse ecosystems and provides drinking water for millions of people downstream.
KOELLIKEN operates under the Swiss Waters Protection Act (GSchG) and the Water Protection Ordinance (GSchV). These laws require wastewater treatment plants to meet stringent effluent standards, including nutrient removal for plants serving over 10,000 people, to prevent pollution of lakes and rivers.
In Switzerland, wastewater treatment plants serving populations around 18,000 are typically classified as medium-sized agglomerations. They are required to implement biological treatment with nutrient removal (nitrogen and phosphorus) to comply with the Swiss Water Protection Ordinance, ensuring high-quality effluent before discharge into sensitive water bodies.
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