Grein Wastewater Treatment Plant, Hößgang, Niederösterreich, Austria

The Grein wastewater treatment plant is located in Hößgang, a locality in the municipality of Neustadtl an der Donau, within the Bezirk Amstetten district of Niederösterreich, Austria. The plant serves a population of 3,856 and operates with advanced treatment technology, ensuring high-quality effluent standards. With a designed capacity of 7,500 m³/day and an average discharge volume of 762.47 m³/day, the plant operates well below its capacity, indicating room for future growth. As an Austrian facility, it adheres to the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates advanced treatment for sensitive areas and secondary treatment for all agglomerations above 2,000 population equivalent. The plant's treated effluent is discharged into the local water system, ultimately contributing to the Danube River basin. The Danube is a major European waterway that flows into the Black Sea, supporting diverse aquatic ecosystems and providing water for millions of people. The advanced treatment at Grein helps protect downstream water quality and biodiversity.

The Grein plant discharges into the Danube River basin, which drains into the Black Sea. The Danube is one of Europe's most important rivers, supporting a rich variety of fish species and migratory birds. The advanced treatment level helps minimize nutrient and pollutant loads, protecting the river's ecological health and the downstream delta ecosystem.