Oelixdorf Wastewater Treatment Plant, Kollmoor, Schleswig-Holstein

The Oelixdorf wastewater treatment plant is located in Kollmoor, a small settlement in the Steinburg district of Schleswig-Holstein, Germany. It served a population of 1,630 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is now closed, reflecting changes in regional wastewater management infrastructure. The plant provided secondary treatment, which is the minimum standard required by the EU UWWTD for freshwater discharges from agglomerations of this size. With a designed capacity of 4,000 m³/day and an average discharge volume of 412.51 m³/day, the facility operated well below its capacity. As a closed facility, its treatment processes are no longer active. The plant's treated effluent was discharged into local watercourses within the Stör river basin, which flows into the Elbe River and ultimately into the North Sea. The region's aquatic ecosystems rely on effective wastewater treatment to maintain water quality, particularly given the agricultural and rural character of the area.

The plant discharged into the Stör river system, a tributary of the Elbe River, which drains into the North Sea. The Stör basin supports diverse aquatic life and is part of a network of waterways important for migratory fish species. Effective wastewater treatment is essential to protect these ecosystems from nutrient loading and pollution.