Losenstein Wastewater Treatment Plant, Oberösterreich, Austria

The Losenstein wastewater treatment plant is located in the municipality of Losenstein, Bezirk Steyr-Land, in the state of Oberösterreich, Austria. It serves a population of 1,927, placing it in the small agglomeration category under Austrian and EU regulations. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for smaller agglomerations. With a designed capacity of 4,310 m³/day and an actual discharge volume of 470.79 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into a local water body that ultimately drains into the Danube River basin, contributing to the protection of the Black Sea ecosystem. The advanced treatment ensures high removal of nutrients and pollutants, safeguarding downstream water quality and aquatic life.

The plant discharges into a tributary of the Enns River, which flows into the Danube River and eventually reaches the Black Sea. The Danube basin is a critical ecological corridor supporting diverse fish species, including sturgeon, and migratory birds. Advanced treatment at this plant helps reduce nutrient loading, protecting downstream habitats from eutrophication.