KA Wiedelah Wastewater Treatment Plant, Goslar, Niedersachsen

KA Wiedelah is a municipal wastewater treatment plant located in the Wiedelah district of Goslar, in the state of Niedersachsen, Germany. The plant serves a population of approximately 13,800, classifying it as a medium-sized agglomeration under European Union regulations. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving between 10,000 and 150,000 population equivalents are required to provide secondary treatment as a minimum, with tertiary treatment mandated if the receiving waters are designated as sensitive areas. The plant's treatment processes are designed to meet these standards, ensuring compliance with German water quality regulations. The treated effluent from KA Wiedelah is discharged into local watercourses that ultimately drain into the North Sea via the Weser river system. The plant plays a crucial role in protecting the region's aquatic ecosystems, including the Innerste River and its tributaries, which support diverse freshwater habitats and are important for regional biodiversity.

The plant discharges into the Innerste River, a tributary of the Leine, which flows into the Aller and then the Weser, eventually reaching the North Sea. The watershed supports diverse aquatic life and is an important corridor for migratory fish species. The region's water quality is regulated under the EU Water Framework Directive, requiring stringent nutrient removal to prevent eutrophication in downstream coastal waters.