Bad Nauheim Rodgen Wastewater Treatment Plant, Schwalheim, Hessen, Germany

The Bad Nauheim Rodgen wastewater treatment plant is located in Schwalheim, a district of Bad Nauheim in Hessen, Germany. It serves a population of 1,901 people and is classified as a small agglomeration under German and EU regulations. The plant is currently closed, but its infrastructure reflects the scale of a small community. The plant provided advanced treatment, which goes beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Its designed capacity was 2,200 m³/day, and the actual discharge volume was 481.10 m³/day, indicating a utilization rate well below capacity. Advanced treatment typically includes nutrient removal to protect sensitive water bodies. The treated effluent was discharged into the local watershed, which ultimately drains into the Rhine River basin. The Rhine is a major European waterway that flows into the North Sea, supporting diverse aquatic ecosystems and serving as a critical water resource. The plant's advanced treatment helped reduce nutrient loads and protect downstream water quality.

The plant's discharge enters the local drainage network, which flows into the Wetter river, a tributary of the Nidda, then the Main, and finally the Rhine River. The Rhine basin is ecologically significant, supporting migratory fish species and providing habitat for diverse aquatic life. Advanced treatment at this plant helped minimize nutrient pollution, contributing to the health of the downstream Rhine ecosystem and the North Sea.