SOLNHOFEN Wastewater Treatment Plant, Solnhofen, Bavaria, Germany

The SOLNHOFEN wastewater treatment plant is located in Solnhofen, a municipality in the Weißenburg-Gunzenhausen district of Bavaria, Germany. It serves a population of 1,686 people and is classified as a small agglomeration under German and EU regulations. The plant is currently closed, but its infrastructure reflects the standards of secondary treatment typical for communities of this size in the region. As a secondary treatment facility, SOLNHOFEN provides biological treatment to reduce organic matter and suspended solids, meeting the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent between 2,000 and 10,000. The plant's designed capacity of 3,000 m³/day and actual discharge of 474.4 m³/day indicate it operated well below capacity, which is common for small rural plants with stable population flows. The plant's treated effluent is discharged into local watercourses that drain into the Altmühl River, a tributary of the Danube. The Danube ultimately flows into the Black Sea, making this plant part of a transboundary river basin. The surrounding region is characterized by karst landscapes and sensitive aquatic habitats, including the Altmühl Valley, which supports diverse fish and invertebrate populations.

The SOLNHOFEN plant discharges into local streams that feed the Altmühl River, a major tributary of the Danube. The Danube flows eastward through several countries before reaching the Black Sea. The Altmühl Valley is an ecologically sensitive area with diverse aquatic life, including endangered fish species and migratory birds. The plant's secondary treatment helps protect downstream water quality in this karst-dominated landscape.