SAEBY Wastewater Treatment Plant, Sæby, Denmark

SAEBY wastewater treatment plant is located in Sæby, Frederikshavn Kommune, Region Nordjylland, Denmark. The plant serves a population equivalent of 79,747, classifying it as a large agglomeration under EU regulations. Its location near the coast places it in a sensitive area requiring advanced treatment to protect marine environments. As a Danish plant serving over 15,000 people, SAEBY is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC). This directive mandates secondary treatment as a minimum, with tertiary treatment required for discharges into sensitive areas such as coastal waters. The plant's designed capacity is 1. Indicating it is sized to handle the local population load. The plant discharges treated wastewater into the Kattegat sea via local watercourses. The Kattegat is a transitional water body between the North Sea and the Baltic Sea, supporting diverse marine life including fish, seabirds, and benthic habitats. Proper treatment is essential to prevent eutrophication and protect this ecologically important marine area.

The SAEBY plant discharges into the Kattegat, a sea area connecting the North Sea and Baltic Sea. This coastal region supports diverse marine ecosystems, including fish spawning grounds and migratory bird routes. Nutrient removal is critical to prevent algal blooms and maintain water quality in this sensitive marine environment.