HILLEROD Wastewater Treatment Plant, Hillerød, Denmark

HILLEROD wastewater treatment plant is located in Hillerød, in the Region Hovedstaden of Denmark. The facility serves a population of approximately 26,700, making it a medium-sized agglomeration under EU classification. It is situated inland, away from the coast, and discharges into local water bodies. As a Danish plant, HILLEROD operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are sensitive. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating it is sized to handle the local load. The treated effluent from HILLEROD flows into the surrounding watershed, which ultimately drains into the Øresund strait via local rivers and streams. This region supports diverse aquatic life and is important for both recreational and ecological purposes. Proper treatment helps protect downstream water quality and the broader Baltic Sea ecosystem.

The plant discharges into local watercourses that feed into the Øresund, a strait connecting the North Sea to the Baltic Sea. This area supports diverse aquatic life and is an important migratory corridor for fish. The Baltic Sea is sensitive to nutrient pollution, making effective wastewater treatment crucial for preventing eutrophication.