TREHOJE OST Wastewater Treatment Plant, Vildbjerg, Denmark

TREHOJE OST is a municipal wastewater treatment plant located at Albækvej in Vildbjerg, within the Herning Municipality of Region Midtjylland, Denmark. The plant serves a population equivalent of approximately 10,021, placing it in the medium agglomeration category under Danish and EU regulations. As a Danish facility, TREHOJE OST operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. Denmark has implemented stringent national standards that often exceed EU minimums, particularly for nutrient removal in sensitive areas. The plant's designed capacity is 1.00 (likely in thousand cubic meters per day or similar unit), indicating a facility sized for its service population. The treated effluent from TREHOJE OST is discharged into the local water system, which ultimately drains to the North Sea via the Skjern River or other regional waterways. The receiving waters support diverse aquatic life and are part of Denmark's efforts to maintain good ecological status under the EU Water Framework Directive. The plant plays a key role in protecting downstream environments from nutrient pollution and organic loads.

TREHOJE OST discharges into the local catchment that feeds into the Skjern River system, one of Denmark's largest river basins, which flows into the Ringkøbing Fjord and then the North Sea. The downstream environment includes ecologically sensitive coastal lagoons and marine habitats that support fish spawning and migratory bird populations. Nutrient removal is critical in this region to prevent eutrophication in the fjord and coastal waters.