MOEHLIN Wastewater Treatment Plant, Möhlin, Aargau, Switzerland

The MOEHLIN wastewater treatment plant is located in Möhlin, a municipality in the canton of Aargau, Switzerland. Serving a population of approximately 20,091, the plant is part of the region's municipal wastewater infrastructure, situated near the Rhine River in the Rhine Valley. As a Swiss treatment facility, MOEHLIN operates under the Federal Water Protection Act (Gewässerschutzgesetz), which mandates advanced treatment standards for all agglomerations. For a plant of this scale, secondary treatment with nutrient removal is typically required to protect sensitive water bodies. The plant's design and operation align with these national regulations, ensuring compliance with strict effluent limits. The treated wastewater from MOEHLIN is discharged into the Rhine River, which flows through Switzerland, Germany, and the Netherlands before reaching the North Sea. The Rhine is a major European waterway and ecologically significant, supporting diverse aquatic life and serving as a critical migratory corridor for fish species. The plant's treatment processes help maintain water quality in this internationally important river system.

The MOEHLIN plant discharges into the Rhine River, which flows through the Upper Rhine Valley in Switzerland and continues through Germany and the Netherlands to the North Sea. The Rhine supports a rich ecosystem, including salmonid fish populations and diverse macroinvertebrate communities. The plant's location in the Rhine basin means its effluent quality directly affects downstream water quality in a river that is a major drinking water source and ecological corridor for migratory fish.