BJERREGRAV Wastewater Treatment Plant, Viborg, Denmark

BJERREGRAV is an advanced wastewater treatment plant located in Viborg, Region Midtjylland, Denmark. The plant serves a population of approximately 3,220 people, making it a small-scale facility within the Danish wastewater infrastructure. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 4,500 m³/day and an average discharge volume of 994.85 m³/day, the plant operates well below its capacity, indicating room for future growth. As a Danish facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates advanced treatment for discharges into sensitive areas. The treated effluent is discharged into local water bodies that eventually drain into the Limfjord or the North Sea. The plant plays a key role in protecting the aquatic environment of the region, supporting water quality standards for downstream ecosystems and recreational use.

The plant discharges into local streams that flow into the Limfjord, a shallow sound connecting the North Sea and the Kattegat. The Limfjord supports diverse aquatic life, including fish and bird populations, and is an important ecological corridor. Advanced treatment at BJERREGRAV helps reduce nutrient loading, mitigating eutrophication risks in the downstream marine environment.