Gachenbach Wastewater Treatment Plant, Weilach, Bavaria, Germany

The Gachenbach wastewater treatment plant is located in Weilach, a district of Gachenbach in the Bavarian region of Germany. It serves a population of approximately 2,069 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is situated inland, far from coastal areas, and its operations are part of the regional water management infrastructure in the Danube basin. The plant provides secondary treatment, which is the standard required by the EU UWWTD for freshwater discharges from agglomerations of this size. With a designed capacity of 3,000 m³/day and an average discharge volume of 529.90 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into local watercourses that ultimately drain into the Danube River basin. The Danube is one of Europe's most significant rivers, flowing through multiple countries before reaching the Black Sea. The plant's operations contribute to protecting the water quality of the Danube and its tributaries, supporting aquatic ecosystems and downstream water uses.

The plant discharges into local streams that are part of the Danube River basin. The Danube flows through Central and Eastern Europe, eventually reaching the Black Sea. This watershed supports diverse aquatic life, including fish species such as sturgeon and carp, and provides important habitats for migratory birds. The plant's secondary treatment helps reduce nutrient and organic pollution, mitigating eutrophication risks in downstream waters.