KA Diepenau Wastewater Treatment Plant, Diepenau, Niedersachsen

KA Diepenau is a municipal wastewater treatment plant located in Diepenau, a town in the district of Nienburg/Weser, Niedersachsen, Germany. The plant serves a population of approximately 2,562 residents, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive. The plant employs advanced treatment processes, which go beyond the EU's minimum requirement of secondary treatment for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant has a designed capacity of 6,800 m³/day and currently discharges 828.60 m³/day of treated effluent. The treated wastewater is discharged into local watercourses that eventually drain into the Weser River basin. The Weser flows northward through Niedersachsen to the North Sea. The plant's advanced treatment helps maintain water quality in the region, supporting aquatic life and downstream ecosystems.

The plant discharges into the Weser River basin, which flows through Niedersachsen and into the North Sea. The Weser is a major river supporting diverse aquatic habitats and is used for agriculture, recreation, and drinking water. Advanced treatment at the plant reduces nutrient loads, helping to prevent eutrophication in downstream waters, including the sensitive Wadden Sea ecosystem.