HJORRING Wastewater Treatment Plant, Hjørring, Denmark

HJORRING is a municipal wastewater treatment plant located in Hjørring, Denmark, serving a population of approximately 60,080. The plant is situated in Region Nordjylland and is part of the country's comprehensive wastewater infrastructure. As a Danish plant serving a medium-sized agglomeration, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for populations over 15,000 and tertiary treatment in sensitive areas. Denmark's coastal zones are often designated as sensitive, so advanced treatment may be expected. The plant's treated effluent likely discharges into the Kattegat, a sea area between Denmark and Sweden, which is ecologically important for marine life and supports fisheries. The plant plays a key role in protecting coastal water quality in the region.

The plant discharges into the Kattegat, a shallow sea area connecting the North Sea and the Baltic Sea. This marine environment supports diverse aquatic life, including fish and seabirds, and is an important shipping route. The plant's location within 50 km of the coast means its effluent directly affects coastal water quality, making nutrient removal critical to prevent eutrophication.