Stubenberg Wastewater Treatment Plant, Steiermark, Austria

The Stubenberg wastewater treatment plant is located in the municipality of Stubenberg, in the district of Hartberg-Fürstenfeld, Steiermark, Austria. This facility serves a population of approximately 1,910 residents and is designed to handle a capacity of 5,500 cubic meters per day, with an average discharge volume of 601.44 cubic meters per day. The plant employs advanced treatment processes, which go beyond the secondary treatment standards required by 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 national regulations often require advanced treatment in sensitive areas to protect water quality. The treated effluent is discharged into local watercourses that ultimately drain into the Danube River basin, which flows into the Black Sea. The plant plays a crucial role in protecting the local aquatic environment and downstream ecosystems from nutrient pollution and other contaminants.

The Stubenberg plant discharges into small streams that feed into the Feistritz River, a tributary of the Lafnitz River, which flows into the Rába River and eventually the Danube. The Danube carries water to the Black Sea. The region's aquatic ecosystems support diverse species, including fish and macroinvertebrates, and the plant's advanced treatment helps maintain water quality in these sensitive freshwater habitats.