Lagerdorf Wastewater Treatment Plant, Lägerdorf, Schleswig-Holstein, Germany

The Lagerdorf wastewater treatment plant is located in Lägerdorf, a municipality in the Steinburg district of Schleswig-Holstein, Germany. It serves a population of approximately 3,327 people, classifying it as a small agglomeration under German and EU regulations. The plant is situated inland, more than 10 km from the coast, and operates within the Elbe river basin. The plant provides advanced treatment, which goes beyond the EU Urban Waste Water Treatment Directive'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's designed capacity is 9,200 m³/day, with an actual discharge volume of 360.25 m³/day, indicating significant spare capacity. As a German facility, it operates under the national Wasserhaushaltsgesetz (Water Resources Act) and relevant state regulations. The treated effluent is discharged into local watercourses that ultimately drain into the Elbe River and then the North Sea. The plant plays a key role in protecting the Elbe estuary and downstream marine environment from nutrient pollution. Its advanced treatment helps reduce eutrophication risks in the North Sea, which is designated as a sensitive area under the EU Urban Waste Water Treatment Directive.

The plant discharges into the local drainage network that flows into the Elbe River, one of Europe's major rivers, which empties into the North Sea. The Elbe estuary supports diverse aquatic life and is an important migratory corridor for fish. The North Sea is a sensitive marine ecosystem where nutrient inputs can cause algal blooms and oxygen depletion. Advanced treatment at this plant helps mitigate these impacts.