ARA Wiental Sammelkanal GmbH 901 WU - Wastewater Treatment Plant in Tullnerbach, Austria

ARA Wiental Sammelkanal GmbH 901 WU is a wastewater treatment plant located in Tullnerbach, a municipality in the district of St. Pölten, Niederösterreich, Austria. The plant serves a population equivalent of 14,385, placing it in the medium agglomeration category under EU classification. As a plant of this scale in Austria, it is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations between 10,000 and 150,000 population equivalents. The plant's treatment process and capacity are designed to meet these regulatory standards, ensuring compliance with national and EU water quality requirements. The treated effluent from the plant is discharged into the local water system, which ultimately drains into the Danube River basin. The Danube is a major European waterway that flows into the Black Sea, supporting diverse aquatic ecosystems and providing water for millions of people. The plant plays a key role in protecting the water quality of this important river system.

The plant discharges into the local tributaries of the Danube River, which flows through Austria and several other countries before reaching the Black Sea. The Danube basin is ecologically sensitive, supporting diverse aquatic life including fish species such as sturgeon and migratory birds. The plant's operations help maintain water quality in this transboundary river system, reducing nutrient loads that could contribute to eutrophication in the Black Sea.