ULLERUP Wastewater Treatment Plant, Ullerup, Denmark

ULLERUP is a former wastewater treatment plant located in Ullerup, Sønderborg Kommune, Region Syddanmark, Denmark. The facility was designed to serve the local community with a capacity of 3000 cubic meters per day, operating at a secondary treatment level before its closure. As a Danish plant, it operated under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for discharges to freshwater and estuaries. The plant's coastal proximity would have necessitated compliance with sensitive area designations under the directive, potentially requiring more advanced treatment if the receiving waters were nutrient-sensitive. The plant's discharge likely affected the local watershed, which drains into the Baltic Sea via the Little Belt strait. The Baltic Sea is a semi-enclosed sea with eutrophication challenges, making nutrient removal critical for coastal plants.

The plant is located within 10 km of the coast, with its treated effluent likely discharging into the Little Belt, a strait connecting the Kattegat to the Baltic Sea. The Baltic Sea is highly sensitive to nutrient pollution, and secondary treatment alone may not have been sufficient to prevent eutrophication in this ecologically important marine environment. The local watershed includes small streams and agricultural areas that contribute to the overall nutrient load.