Amerang Wastewater Treatment Plant, Bavaria, Germany

The Amerang wastewater treatment plant is located in the municipality of Amerang, in the district of Rosenheim, Bavaria, Germany. It serves a population of approximately 2,806 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is situated inland, away from coastal areas, and its operations are part of the regional water management infrastructure in the Inn river basin. The plant provides 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 3,500 m³/day and a current discharge volume of 400.24 m³/day, the plant 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 eventually drain into the Inn River, a major tributary of the Danube. The Danube then flows into the Black Sea, making this plant part of a vast transboundary river basin. The surrounding region is characterized by agricultural land and small settlements, and the plant plays a key role in protecting local streams and groundwater from nutrient pollution.

The Amerang plant discharges into small streams that feed into the Inn River, which joins the Danube and ultimately reaches the Black Sea. The local watershed supports diverse aquatic life and is used for agriculture and recreation. Effective nutrient removal from wastewater is critical to prevent eutrophication in downstream water bodies, particularly in the Danube delta and coastal Black Sea ecosystems.