ARA Hollabrunn 155 HL Wastewater Treatment Plant, Hollabrunn, Niederösterreich

ARA Hollabrunn 155 HL is a municipal wastewater treatment plant located in Hollabrunn, Niederösterreich, Austria. The plant serves a population of approximately 20,368, classifying it as a medium-sized agglomeration under EU regulations. Situated in the northeastern part of Austria, the plant supports the local community's sanitation needs. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving agglomerations of this scale are required to provide secondary treatment as a minimum. In sensitive areas, more stringent treatment may be mandated. The plant's treatment processes are designed to meet these regulatory standards, ensuring compliance with Austrian and EU water quality requirements. The treated effluent from ARA Hollabrunn is discharged into local water bodies that ultimately drain into the Danube River basin. The Danube is a major European waterway, flowing into the Black Sea. The plant plays a crucial role in protecting the ecological health of the region's streams and rivers, supporting aquatic life and downstream water quality.

The plant discharges into local streams that are part of the Danube River basin, which flows through Central and Eastern Europe before reaching the Black Sea. The region's watershed supports diverse aquatic ecosystems, including fish species and riparian habitats. Effective wastewater treatment is essential to prevent nutrient pollution and maintain the ecological balance of these water bodies.