KA Hamelerwald Wastewater Treatment Plant, Lehrte, Niedersachsen

KA Hamelerwald (plant ID 2530102176) is an advanced wastewater treatment facility located in the Hämelerwald district of Lehrte, in the Region Hannover of Niedersachsen, Germany. The plant serves a population equivalent of approximately 4,501 and has a designed capacity of 5,000 cubic meters per day, with an average discharge volume of 786.42 m³/day. As an advanced treatment plant, KA Hamelerwald goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, meeting stringent German and EU standards. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this size (4,501 PE) are required to provide secondary treatment, but the plant's advanced level indicates it likely discharges into a sensitive area or follows higher regional standards. The plant's treated effluent is discharged into local watercourses that ultimately drain into the Aller River system, part of the Weser basin, which flows into the North Sea. The surrounding region is characterized by agricultural land and small settlements, making nutrient removal critical to prevent eutrophication in downstream waters.

The plant discharges into the Aller River basin, a tributary of the Weser, which flows into the North Sea. The Weser estuary supports diverse aquatic life and is an important migratory corridor for fish species. Advanced treatment at this plant helps reduce nutrient loads that could otherwise contribute to algal blooms and oxygen depletion in the North Sea coastal zone.