Dageling Wastewater Treatment Plant, Dägeling, Schleswig-Holstein

The Dageling wastewater treatment plant is located in Dägeling, a municipality in the Steinburg district of Schleswig-Holstein, Germany. The plant served a population of 1,278 and is now closed. It was situated near the A23 motorway, within 10 km of the North Sea coast. Although the plant is closed, it was designed with a capacity of 3,000 m³/day and treated wastewater to an advanced level. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants in sensitive coastal areas like this are expected to achieve tertiary treatment to protect the marine environment. The plant's advanced treatment level aligns with these requirements. The treated effluent was discharged into local waterways that drain into the North Sea. The region's coastal ecology includes mudflats and salt marshes that support migratory birds and diverse aquatic life. The plant's advanced treatment helped minimize nutrient and pollutant loads to this sensitive ecosystem.

The plant discharged into the Elbe River basin, which flows into the North Sea near the Schleswig-Holstein Wadden Sea. This coastal area is ecologically sensitive, supporting migratory bird populations and marine biodiversity. Advanced treatment was crucial to reduce eutrophication risks in the North Sea.