SDRNYRUP Wastewater Treatment Plant, Kalundborg, Denmark

SDRNYRUP is a wastewater treatment plant located in Kalundborg, Region Sjælland, Denmark. It serves a population of approximately 2,700 people and operates under secondary treatment, which is the standard for smaller agglomerations under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant's designed capacity is 3,500 m³/day, with an average discharge volume of 534.96 m³/day. As a secondary treatment facility, SDRNYRUP meets the EU directive's requirements for biological treatment, reducing organic matter and suspended solids. For plants of this scale in Denmark, compliance with national regulations ensures that effluent quality standards are maintained to protect receiving waters. The plant is situated within 10 km of the coast, highlighting the importance of effective treatment to prevent nutrient enrichment in marine environments. The treated wastewater from SDRNYRUP discharges into local watercourses that eventually flow into the Kattegat or the Great Belt, both part of the Baltic Sea system. This coastal discharge requires careful management to minimize impacts on sensitive marine ecosystems, including nutrient loading and algal blooms. The plant plays a key role in safeguarding the ecological health of the region's coastal waters.

The plant discharges into local streams that drain into the Kattegat, a sea area connecting the Baltic Sea to the North Sea. This coastal region supports diverse marine life, including fish spawning grounds and migratory bird habitats. Effective secondary treatment helps reduce nutrient inputs that could otherwise contribute to eutrophication in the Baltic Sea, a semi-enclosed basin sensitive to nitrogen and phosphorus pollution.