JYLLINGE Wastewater Treatment Plant, Roskilde, Denmark

JYLLINGE is a wastewater treatment plant located in Roskilde, Region Sjælland, Denmark. It serves a population equivalent of 15,260, placing it in the medium agglomeration category under EU classification. The plant is situated near the coast, within 50 km of the sea, and its operations are subject to Danish environmental regulations aligned with EU directives. As a Danish facility, JYLLINGE is required to meet the standards of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size. Danish wastewater infrastructure is known for high compliance with EU standards, often incorporating advanced treatment to protect sensitive coastal waters. The plant discharges into the local watershed, which ultimately drains into the Roskilde Fjord and then into the Kattegat sea. This coastal environment supports diverse marine life and is an important area for fisheries and recreation. The plant plays a key role in maintaining water quality in the fjord, which is ecologically sensitive due to its brackish waters and nutrient dynamics.

JYLLINGE's treated effluent flows into the Roskilde Fjord, a shallow estuary connected to the Kattegat and the North Sea. The fjord supports diverse aquatic life, including fish, birds, and marine vegetation, and is an important migratory corridor. Nutrient loading from wastewater can contribute to eutrophication, making effective treatment critical for the health of this coastal ecosystem.