Oldenswort Wastewater Treatment Plant, Schleswig-Holstein, Germany

Oldenswort wastewater treatment plant is located in the municipality of Oldenswort, in the district of Nordfriesland, Schleswig-Holstein, Germany. The plant serves a small population of 878 and is situated near the North Sea coast, within 10 km of the shoreline. It is currently closed. As a German plant serving fewer than 2,000 people, it falls under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires appropriate treatment for small agglomerations. Secondary treatment was provided, meeting the directive's minimum standard for freshwater discharges. The plant had a designed capacity of 2,229 m³/day and a discharge volume of 222.2 m³/day. The plant's treated effluent likely discharged into local drainage channels that flow into the Eiderstedt peninsula's tidal flats and eventually the North Sea. The Wadden Sea, a UNESCO World Heritage site, is a critical ecosystem in this region, supporting migratory birds and marine life. The plant's closure means local wastewater is now managed elsewhere, reducing direct discharge impacts.

The plant is located on the Eiderstedt peninsula, a low-lying coastal area drained by a network of ditches and canals that flow into the North Sea. The receiving waters are part of the Wadden Sea ecosystem, a highly productive intertidal zone that supports diverse bird populations, fish, and benthic communities. The region is ecologically sensitive due to its role as a migratory stopover and nursery habitat.