ARA Heiligenkreuz 1569 BN - Advanced Wastewater Treatment Plant in Heiligenkreuz, Austria

ARA Heiligenkreuz 1569 BN is an advanced wastewater treatment plant located in Heiligenkreuz, a municipality in the district of Baden, Niederösterreich, Austria. The plant serves a population of approximately 3,900 people and is part of the region's municipal wastewater infrastructure. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 4,500 m³/day and a current discharge volume of 879.71 m³/day, the facility operates well within its capacity. As an Austrian plant, it complies with the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels for agglomerations of this size. The treated effluent is discharged into the local water environment, contributing to the protection of the Danube River basin. The plant plays a key role in safeguarding water quality in the region, supporting both ecological health and downstream uses.

The plant discharges into the Helenental valley, part of the Schwechat River catchment, which flows into the Danube River near Vienna. The Danube is a major European waterway that ultimately reaches the Black Sea. The local watershed supports diverse aquatic life and is an important ecological corridor. Advanced treatment helps minimize nutrient loading, protecting downstream ecosystems from eutrophication.