ARA Grossharras 1810 MI Wastewater Treatment Plant, Großharras, Lower Austria

ARA Grossharras 1810 MI is a municipal wastewater treatment plant located in Großharras, a town in the Bezirk Mistelbach district of Lower Austria, Austria. The plant serves a population of about 1,878 people and has a designed capacity of 3,700 m³ per day, with an average discharge volume of 298.78 m³/day. As an advanced treatment facility, ARA Grossharras 1810 MI provides tertiary-level treatment, which goes beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. This ensures high-quality effluent that meets stringent standards for nutrient removal, particularly important for sensitive receiving environments. The plant's treated effluent is discharged into local watercourses that ultimately drain into the Danube River basin. The Danube is a major European river that flows into the Black Sea, supporting diverse aquatic ecosystems and providing water for millions of people. The advanced treatment at this plant helps protect downstream water quality and ecological health.

The plant discharges into the local drainage network within the Danube River basin. The Danube flows eastward through Central and Eastern Europe before emptying into the Black Sea. This region supports diverse aquatic life, including fish species such as sturgeon and migratory birds. Advanced treatment at the plant reduces nutrient loads, helping to prevent eutrophication in downstream waters and the Black Sea.