KA Gadenstedt Wastewater Treatment Plant, Ilsede, Niedersachsen

KA Gadenstedt is a municipal wastewater treatment plant located in the Ölsburg district of Ilsede, in the Landkreis Peine region of Niedersachsen, Germany. The plant serves a population of approximately 2,376 people, classifying it as a small agglomeration under European Union classification. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant has a designed capacity of 4,000 m³/day and currently treats an average daily flow of 473.51 m³/day, indicating significant spare capacity. The treated effluent is discharged into local watercourses that ultimately drain into the North Sea via the Weser river system. The plant plays a key role in protecting the region's surface water quality, supporting aquatic life and downstream ecosystems in the Weser basin.

The plant's discharge enters the local drainage network, which flows into the Fuhse river, a tributary of the Aller, which joins the Weser river. The Weser flows northward through Niedersachsen and discharges into the North Sea near Bremerhaven. The downstream environment includes ecologically sensitive areas such as the Weser estuary, which supports diverse aquatic life and serves as an important migratory corridor for fish species.