Freienwill Wastewater Treatment Plant, Kleinwolstrup | Schleswig-Holstein

The Freienwill wastewater treatment plant is located in Kleinwolstrup, a locality within the municipality of Freienwill in the district of Schleswig-Flensburg, Schleswig-Holstein, Germany. It serves a population of 2,469 and operates with advanced treatment technology, ensuring high-quality effluent. The plant has a designed capacity of 2,700 m³/day and currently discharges 266.80 m³/day of treated wastewater. As a German wastewater facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for sensitive areas. For agglomerations of this size (under 10,000 population equivalent), secondary treatment is typically mandated, but the plant's advanced treatment level indicates it likely discharges into a sensitive water body or has additional nutrient removal requirements. The plant's capacity utilization is low, suggesting it has room for future growth. The treated effluent is discharged into local watercourses that eventually drain into the Baltic Sea via the Schlei or Flensburg Fjord. The region's aquatic ecosystems benefit from the plant's advanced treatment, which reduces nutrient loads and protects downstream habitats. The plant plays a key role in maintaining water quality in this ecologically sensitive coastal area.

The plant's discharge enters local streams that flow into the Flensburg Fjord, a Baltic Sea inlet. This coastal region supports diverse marine life, including fish spawning grounds and migratory bird habitats. Advanced treatment helps minimize eutrophication risks in the fjord, which is part of the Baltic Sea's sensitive ecosystem. The plant's location within 50 km of the coast underscores its importance in protecting coastal water quality.