ARA Ottenthal 2158 MI - Advanced Wastewater Treatment in Ottenthal, Austria

ARA Ottenthal 2158 MI is a municipal wastewater treatment plant located in Ottenthal, a small town in the Mistelbach district of Niederösterreich, Austria. The plant serves a population of 423 and is designed with a capacity of 2000 m³ per day, indicating it is sized for a small agglomeration. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. This level of treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The treated effluent is discharged into local watercourses that drain into the Danube River basin, ultimately reaching the Black Sea. The plant's advanced treatment helps safeguard the ecological health of these waters, supporting aquatic life and downstream ecosystems.

The plant discharges into small streams in the Weinviertel region, which flow into the Thaya River, a tributary of the Morava River, and eventually the Danube. The Danube basin is a major European waterway supporting diverse aquatic species and providing drinking water for millions. Advanced treatment at this plant helps reduce nutrient loading, protecting the Danube's ecological balance and preventing eutrophication in the Black Sea.