ARA Filzmoos Wastewater Treatment Plant, Filzmoos, Salzburg, Austria

ARA Filzmoos is an advanced wastewater treatment facility located in the municipality of Filzmoos in the state of Salzburg, Austria. The plant serves a population of approximately 3,930 people and is designed to handle a capacity of 10,000 cubic meters per day, with an average discharge volume of 423.10 cubic meters per day. As an advanced treatment plant, ARA Filzmoos goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, ensuring high-quality effluent. This level of treatment is typical for plants in sensitive areas under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires tertiary treatment for agglomerations discharging into sensitive water bodies. The treated wastewater from ARA Filzmoos is discharged into local watercourses that ultimately drain into the Enns River, a major tributary of the Danube River. The Danube flows into the Black Sea, making the plant's advanced treatment crucial for protecting downstream aquatic ecosystems and the broader Danube basin.

ARA Filzmoos discharges into small streams in the Enns River basin, which flows into the Danube River and eventually reaches the Black Sea. The region is characterized by alpine terrain and sensitive freshwater ecosystems that support diverse aquatic life, including fish species like brown trout and grayling. Advanced treatment helps minimize nutrient loading and protects water quality in these ecologically important headwaters.