WOHLEN Wastewater Treatment Plant, Wohlen, Aargau, Switzerland

The WOHLEN wastewater treatment plant is located in Wohlen, in the canton of Aargau, Switzerland. It serves a population of around 32,950 people, making it a medium-sized facility within the Swiss wastewater infrastructure. The plant is situated near the Bünz River, a tributary of the Aare River, which flows into the Rhine. Switzerland's water protection legislation, particularly the Federal Water Protection Act (GSchG), requires that all wastewater treatment plants meet stringent standards for nutrient removal and effluent quality. For a plant serving this population size, secondary treatment with phosphorus removal is typical, and advanced treatment may be required depending on the sensitivity of the receiving water body. The treated effluent from the plant likely discharges into the Bünz River, which flows into the Aare and then the Rhine. The Rhine is a major European river that supports diverse aquatic ecosystems and provides drinking water for millions. The plant plays a crucial role in protecting the water quality of these downstream waters.

The plant discharges into the Bünz River, a tributary of the Aare River, which ultimately flows into the Rhine River. The Rhine is a vital waterway for Europe, supporting diverse aquatic life and providing drinking water for millions. The plant's location in the Aargau region, an area with mixed agricultural and urban land use, means that effective nutrient removal is important to prevent eutrophication in downstream lakes and rivers.