ARA Annaberg - Advanced Wastewater Treatment Plant in Annaberg-Lungötz, Salzburg

ARA Annaberg is an advanced wastewater treatment facility located in Annaberg-Lungötz, a municipality in the Salzburg region of Austria. The plant serves a population of approximately 4,050 residents, reflecting its role in managing domestic wastewater for this Alpine community. As an advanced treatment plant, ARA Annaberg goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, ensuring high-quality effluent. With a designed capacity of 5,700 m³/day and an average discharge volume of 667.23 m³/day, the plant operates well within its capacity. Austrian wastewater treatment plants are regulated under national laws that transpose the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates advanced treatment for sensitive areas. The plant's treated effluent is discharged into local watercourses that eventually drain into the Danube River basin, contributing to the protection of the Black Sea ecosystem. The Alpine setting means the receiving waters are sensitive to nutrient pollution, making advanced treatment crucial for preserving water quality and aquatic biodiversity.

The plant discharges into small streams in the Salzach River catchment, which flows into the Inn River and then the Danube, ultimately reaching the Black Sea. The Alpine watershed is ecologically sensitive, supporting diverse aquatic life and requiring strict nutrient control to prevent eutrophication in downstream water bodies.