Muhlen Eichsen Wastewater Treatment Plant, Testorf-Steinfort, Germany

The Muhlen Eichsen wastewater treatment plant is located in Testorf-Steinfort, a municipality in the Nordwestmecklenburg district of Mecklenburg-Vorpommern, Germany. The plant served a population equivalent of approximately 1,976 people and is now closed. It was designed with a capacity of 3,000 cubic meters per day and discharged an average volume of 416.45 cubic meters per day. The plant provided advanced treatment, which goes beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. As a German facility, it operated under the national Wasserhaushaltsgesetz (Water Resources Act) and relevant state regulations. The treated effluent was discharged into local watercourses that drain into the Baltic Sea via the Wismar Bay. The region's watershed includes small rivers and streams that flow northward. The Baltic Sea is a brackish inland sea with limited water exchange, making it sensitive to nutrient inputs. The advanced treatment at this plant helped reduce eutrophication risks in the downstream environment.

The plant's discharge enters local streams that flow into the Wismar Bay, part of the Baltic Sea. The Baltic Sea is a semi-enclosed brackish sea with slow water turnover, making it highly sensitive to nutrient pollution. Advanced treatment at this plant helped mitigate eutrophication, which can cause algal blooms and oxygen depletion in coastal waters. The surrounding area in Mecklenburg-Vorpommern includes agricultural land and small settlements, contributing diffuse nutrient loads that the plant's advanced treatment helped offset.