Paderborn Dahl Wastewater Treatment Plant, Paderborn, Nordrhein-Westfalen

Paderborn Dahl is a former wastewater treatment plant located in the Dahl district of Paderborn, in the state of Nordrhein-Westfalen, Germany. The facility served a small population of approximately 2,739 people and had a design capacity of 2,000 cubic meters per day. The plant is now closed, and its operational history reflects the wastewater management needs of this suburban area within the Paderborn municipality. As an advanced treatment facility, Paderborn Dahl was designed to provide a high level of pollutant removal, likely including biological nutrient removal or tertiary filtration. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this size (2,739 population equivalent) are required to have secondary treatment, but the advanced level indicates additional measures to protect sensitive receiving waters. The plant's discharge volume of 693.17 m³/day suggests it operated below its design capacity during its active period. The treated effluent from Paderborn Dahl was discharged into local watercourses that ultimately drain into the Lippe River, a tributary of the Rhine. The Lippe River flows through the region and supports diverse aquatic life, including fish species such as barbel and chub. The plant's advanced treatment would have helped maintain water quality in this ecologically important river system, which is part of the larger Rhine basin.

The plant's discharge entered local streams that flow into the Lippe River, a major tributary of the Rhine. The Lippe River supports a variety of aquatic species and is an important corridor for migratory fish. The advanced treatment level at Paderborn Dahl would have helped protect downstream water quality in the Rhine basin, which is a densely populated and economically vital region in Europe.