Satrup Wastewater Treatment Plant, Mittelangeln, Schleswig-Holstein, Germany

The Satrup wastewater treatment plant is located in Mittelangeln, in the Schleswig-Flensburg district of Schleswig-Holstein, Germany. It serves a population of approximately 15,000 and is designed to handle a capacity of 25,000 m³ per day, currently discharging around 995 m³ daily. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. As a German facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for agglomerations over 10,000 population equivalent in sensitive areas. Schleswig-Holstein designates many water bodies as sensitive, making advanced treatment necessary. The treated effluent is discharged into local watercourses that eventually drain into the Baltic Sea via the Schlei inlet or the Flensburg Fjord. The region's aquatic ecosystems, including coastal lagoons and estuaries, benefit from the plant's high treatment standards, which help reduce nutrient loading and protect marine biodiversity.

The plant discharges into small streams in the Angeln region, which flow into the Schlei, a narrow Baltic Sea inlet, or the Flensburg Fjord. These coastal waters are ecologically sensitive, supporting diverse fish, bird, and plant life. Advanced treatment at Satrup helps minimize nutrient pollution, protecting the Baltic Sea from eutrophication and preserving habitat for species such as eelgrass and migratory waterfowl.