Eggebek_Langstedt Wastewater Treatment Plant, Langstedt, Schleswig-Holstein

Eggebek_Langstedt is an advanced wastewater treatment plant located in Langstedt, within the municipality of Eggebek in the Schleswig-Flensburg district of Schleswig-Holstein, Germany. The plant serves a population of approximately 2,700 and has a designed capacity of 5,500 cubic meters per day, with an average discharge volume of 457 cubic meters per day. As an advanced treatment facility, it goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is typical for plants in sensitive areas under the EU Urban Waste Water Treatment Directive (91/271/EEC). Germany implements this directive through national legislation, requiring tertiary treatment for agglomerations above 10,000 population equivalent in sensitive catchments, though smaller plants like this one may also adopt advanced treatment voluntarily or due to local requirements. The treated effluent is discharged into local watercourses that drain into the Treene River, a tributary of the Eider River, which ultimately flows into the North Sea. This region is part of the Eider-Treene-Sorge lowlands, an ecologically important area for migratory birds and aquatic biodiversity. The plant's advanced treatment helps reduce nutrient loading, protecting downstream waters from eutrophication.

The plant discharges into the Treene River catchment, which flows into the Eider River and then the North Sea. This watershed supports diverse aquatic life and is part of a lowland region important for bird migration. Advanced treatment reduces nutrient loads, helping to prevent algal blooms and maintain water quality in the sensitive North Sea coastal environment.