Hatzendorf Wastewater Treatment Plant, Fehring, Styria, Austria

The Hatzendorf wastewater treatment plant is located in the municipality of Fehring, in the Styria region of southeastern Austria. This facility serves a population of approximately 1,484 people, reflecting a small agglomeration typical of rural Austrian communities. The plant is situated inland, away from coastal areas, and contributes to local water quality management. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 2,700 m³/day and an actual discharge volume of 366.79 thousand m³ per year, the facility operates well within its capacity. Austrian wastewater plants are regulated under national law implementing EU directives, with permits issued by regional authorities. The treated effluent is discharged into local watercourses that ultimately drain into the Danube River basin, which flows into the Black Sea. The plant's advanced treatment helps protect the sensitive aquatic ecosystems of the Danube watershed, supporting biodiversity and water quality for downstream communities.

The plant discharges into local streams that are part of the Danube River basin, one of Europe's most significant river systems. The Danube flows through multiple countries before reaching the Black Sea, supporting diverse aquatic life and providing water for millions of people. The advanced treatment at Hatzendorf reduces nutrient loads, helping to prevent eutrophication in downstream water bodies and maintaining the ecological health of the watershed.