ARA Haidershofen Dorf an der Enns Hainbuch 3055 AM - Advanced Wastewater Treatment in Haidershofen, Austria

ARA Haidershofen Dorf an der Enns Hainbuch 3055 AM is an advanced wastewater treatment facility located in Haidershofen, a municipality in the Bezirk Amstetten district of Niederösterreich, Austria. The plant serves a population of approximately 3,665 residents and has a designed capacity of 4,700 cubic meters per day, with a current discharge volume of 343.02 cubic meters per day. As an advanced treatment plant, it goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, meeting the stringent requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (under 10,000 population equivalent), the directive mandates appropriate treatment, and Austria's implementation often requires advanced treatment in sensitive areas to protect water quality. The plant discharges treated effluent into the local water system, which ultimately drains into the Enns River, a tributary of the Danube. The Danube flows through Central and Eastern Europe into the Black Sea. The advanced treatment helps protect the Enns and Danube ecosystems from eutrophication, supporting aquatic life and biodiversity in these important river systems.

The plant's treated effluent enters the local drainage network, which flows into the Enns River near Haidershofen. The Enns is a major tributary of the Danube, one of Europe's most significant rivers, ultimately reaching the Black Sea. The advanced treatment process reduces nutrient loads, helping to prevent algal blooms and maintain water quality in the Enns and downstream Danube ecosystems, which support diverse fish populations and migratory bird species.