Hunderdorf Wastewater Treatment Plant, Starzenberg, Bavaria

The Hunderdorf wastewater treatment plant is located in Starzenberg, a district of Hunderdorf in the Bavarian region of Germany. It serves a population of 4,661 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 operates within the regulatory framework of the German water management system. The facility provides advanced treatment, which goes beyond the secondary treatment standard required by the EU UWWTD for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant has a designed capacity of 5,500 m³/day and currently discharges an average of 897.33 m³/day, indicating ample reserve capacity for future growth or seasonal variations. The treated effluent is discharged into a local watercourse that eventually drains into the Danube River basin. The Danube is a major European river that flows into the Black Sea, supporting diverse aquatic ecosystems along its course. The advanced treatment helps minimize nutrient loading and protects downstream water quality in this ecologically significant watershed.

The plant discharges into a tributary of the Danube River system, which flows through Bavaria and ultimately reaches the Black Sea. The Danube basin is a vital ecological corridor supporting numerous fish species, migratory birds, and riparian habitats. Advanced treatment at this plant reduces nutrient pollution, helping to prevent eutrophication in downstream lakes and the Black Sea coastal zone.