Niederwaldkirchen Wastewater Treatment Plant | Oberösterreich, Austria

The Niederwaldkirchen wastewater treatment plant is located in the municipality of Niederwaldkirchen, Bezirk Rohrbach, in the state of Oberösterreich, Austria. It serves a population of 1,672, classifying it as a small agglomeration under Austrian and EU wastewater regulations. The plant employs advanced treatment processes, which go beyond the EU Urban Waste Water Treatment Directive's secondary treatment requirement for inland areas. With a designed capacity of 3,000 m³/day and an average discharge volume of 352.21 m³/day, the plant operates well below its capacity, indicating room for future growth. Treated effluent is discharged into local watercourses that drain into the Danube River basin, ultimately reaching the Black Sea. The plant's advanced treatment helps protect the sensitive aquatic ecosystems of the Danube and its tributaries, supporting biodiversity and water quality in the region.

The plant discharges into small streams in the Mühlviertel region, which flow into the Danube River via the Große Mühl or similar tributaries. The Danube is a major European waterway supporting diverse aquatic life and providing drinking water for millions. Advanced treatment at this plant reduces nutrient loads, helping to prevent eutrophication in downstream waters, including the Black Sea.