HOJER Wastewater Treatment Plant, Tønder, Denmark - Secondary Treatment for Coastal Protection

HOJER is a municipal wastewater treatment plant located at 1A Siltoftvej in Tønder, Denmark, serving a population of 3,790. The plant is situated in the Tønder Kommune region, close to the Wadden Sea coast, and is part of Denmark's comprehensive wastewater infrastructure. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 4,500 cubic meters per day and an average discharge volume of 621.42 cubic meters per day, the plant operates well within its capacity, ensuring effective treatment of the local wastewater load. The treated effluent from HOJER is discharged into the local watershed, which ultimately drains into the Wadden Sea, a UNESCO World Heritage site known for its unique intertidal ecosystems. The plant plays a crucial role in protecting the sensitive coastal environment by reducing nutrient and pollutant loads, supporting the ecological health of the Wadden Sea and its dependent bird and marine life.

HOJER discharges treated wastewater into the local drainage network that flows into the Wadden Sea, a shallow coastal sea along the Danish and German North Sea coast. The Wadden Sea is an ecologically sensitive area supporting diverse aquatic life, including migratory birds and marine species. The plant's secondary treatment helps reduce organic matter and nutrient loads, mitigating eutrophication risks in this important intertidal ecosystem.