ARA Hollenstein_Ybbs 3060 AM - Advanced Wastewater Treatment in Hollenstein an der Ybbs, Austria

ARA Hollenstein_Ybbs 3060 AM is a wastewater treatment facility located in Hollenstein an der Ybbs, a municipality in the Bezirk Amstetten district of Niederösterreich (Lower Austria), Austria. The plant serves a population of approximately 2,255 people, placing it in the small agglomeration category under Austrian and EU regulations. The plant provides advanced treatment, which goes beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 3,000 m³/day and a reported discharge volume of 340.60 m³/day, the facility operates well within its capacity, ensuring effective treatment of municipal wastewater. The treated effluent is discharged into the local watershed, which ultimately drains into the Ybbs River, a tributary of the Danube. The Danube flows through Central and Eastern Europe into the Black Sea. The advanced treatment level helps protect the sensitive aquatic ecosystems of the Ybbs and Danube rivers, supporting biodiversity and water quality downstream.

The plant discharges into the Ybbs River, which flows into the Danube River, one of Europe's major waterways. The Danube basin supports diverse aquatic life and is an important ecological corridor. Advanced treatment at this plant helps reduce nutrient loads, protecting downstream water quality in the Danube and ultimately the Black Sea.