KA Friedenweiler Rotenbach Wastewater Treatment Plant, Rötenbach, Germany

KA Friedenweiler Rotenbach is a municipal wastewater treatment plant located in Rötenbach, a district of Friedenweiler in the Breisgau-Hochschwarzwald district of Baden-Württemberg, Germany. The plant serves a population of approximately 4,600, placing it in the small-to-medium agglomeration category under German and EU regulations. As a German plant serving fewer than 10,000 people, it is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment based on the receiving water's sensitivity. For inland plants in this population range, secondary treatment is typically mandated, with tertiary treatment required if discharging into sensitive areas. It meets the regulatory standards applicable to its scale and location. The plant discharges into local watercourses that ultimately drain into the Danube River basin via the Wutach River, a tributary of the Rhine. The Wutach Gorge is an ecologically significant area, supporting diverse aquatic life and serving as a habitat for rare species. The plant's operations are critical to protecting this sensitive downstream environment from nutrient pollution and organic load.

The plant's treated effluent flows into the local stream network, which feeds the Wutach River, a tributary of the High Rhine. The Wutach Gorge is a protected landscape with high ecological value, supporting diverse fish populations and rare flora. Downstream, the Rhine carries water to the North Sea, making the plant's nutrient removal performance important for both local and regional water quality.