LEJRE Wastewater Treatment Plant, Lejre, Region Sjælland, Denmark

The LEJRE wastewater treatment plant is located in Lejre, a town in Region Sjælland, Denmark. It serves a population of 2,159 and operates with advanced treatment technology, reflecting Denmark's high environmental standards. The plant's designed capacity is 4,950 m³/day, with a current discharge volume of 514.12 m³/day. As a Danish facility, LEJRE operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for discharges into sensitive areas. Denmark has designated many coastal waters as sensitive, necessitating nutrient removal to protect the Baltic Sea. The plant's advanced treatment level aligns with these requirements. The treated effluent from LEJRE ultimately reaches the Baltic Sea via local streams and fjords. The Baltic Sea is a semi-enclosed, brackish sea with limited water exchange, making it vulnerable to eutrophication from nutrient inputs. The plant's advanced treatment helps reduce nitrogen and phosphorus loads, supporting the ecological health of this sensitive marine environment.

LEJRE plant discharges into local watercourses that drain into the Isefjord, a shallow fjord connected to the Kattegat and the Baltic Sea. The Baltic Sea is highly sensitive to nutrient pollution, and Denmark's advanced treatment requirements aim to mitigate eutrophication. The plant's coastal proximity means its effluent directly influences the fjord's water quality and marine life.