Raab Wastewater Treatment Plant, Brünning, Oberösterreich, Austria

The Raab wastewater treatment plant is located in Brünning, a locality in the municipality of Raab, Bezirk Schärding, Oberösterreich, Austria. The plant serves a population of 2,442 and operates with advanced treatment technology, ensuring high-quality effluent suitable for discharge into sensitive environments. As an advanced treatment facility, Raab goes beyond the secondary treatment requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC). For small agglomerations under 10,000 population equivalent, the directive mandates appropriate treatment, and Austria's national regulations often require advanced nutrient removal to protect water bodies. The plant's designed capacity of 3,510 m³/day indicates it can handle peak flows, while current discharge volume is 580.80 m³/day. The treated effluent from Raab ultimately flows into the Inn River via local tributaries, contributing to the Danube River basin. The Inn is a major tributary of the Danube, supporting diverse aquatic life and providing water for downstream communities. Advanced treatment at Raab helps reduce nutrient loads, protecting the ecological health of the Inn and Danube rivers.

The Raab plant discharges into local watercourses that drain into the Inn River, a major tributary of the Danube. The Danube basin is ecologically significant, supporting diverse fish species and migratory birds. Advanced treatment at Raab reduces phosphorus and nitrogen loads, helping to prevent eutrophication in downstream rivers and the Black Sea.