ARA AV Oberes Russbachtal 1253 KO Wastewater Treatment Plant, Würnitz, Austria

ARA AV Oberes Russbachtal 1253 KO is a wastewater treatment plant located in Würnitz, a village in the district of Korneuburg in Niederösterreich, Austria. The plant serves a population of approximately 4,295 people, placing it in the category of small to medium agglomerations under the EU Urban Waste Water Treatment Directive (UWWTD). As a plant serving fewer than 10,000 population equivalents, it is subject to the EU UWWTD requirements for appropriate treatment, typically secondary treatment or equivalent. It operates within Austria's national implementation of the directive, which mandates compliance with effluent quality standards. The plant discharges treated wastewater into the local watershed, which drains into the Danube River basin. The Danube is a major European river that flows into the Black Sea, supporting diverse aquatic life and providing water for agriculture and industry. The plant's operation helps protect the local streams and the broader Danube ecosystem from nutrient pollution and pathogens.

The plant's treated effluent enters the Russbach stream, a tributary of the Danube River. The Danube flows through Central and Eastern Europe before emptying into the Black Sea, creating a vast delta that is an ecologically sensitive area supporting diverse aquatic species, including migratory fish and waterfowl. The plant's nutrient removal helps prevent eutrophication in downstream waters.