Birkfeld Wastewater Treatment Plant: Advanced Treatment in Steiermark, Austria

The Birkfeld wastewater treatment plant is located in the municipality of Birkfeld, in the district of Weiz, Steiermark, Austria. It serves a population of approximately 4,858, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant operates with advanced treatment technology, ensuring high-quality effluent before discharge. As an advanced treatment facility, Birkfeld goes beyond the secondary treatment standard required by the EU UWWTD for agglomerations of this size. The plant has a designed capacity of 7,500 m³/day and currently treats an average daily flow of 691.60 m³/day, indicating significant spare capacity. This level of treatment is typical for plants in sensitive areas or those discharging into ecologically valuable water bodies. The treated effluent from Birkfeld is discharged into local watercourses that eventually drain into the Danube River basin. The plant plays a crucial role in protecting the water quality of the region's streams and rivers, which support diverse aquatic life and are used for recreation and agriculture downstream.

The Birkfeld plant discharges into the local watershed, which is part of the Danube River basin. The receiving waters flow through the Feistritz River and eventually into the Mur River, a major tributary of the Drava and ultimately the Danube. This region supports sensitive aquatic ecosystems, including fish populations and riparian habitats. Advanced treatment helps minimize nutrient loading and protects downstream water quality in the Danube Delta.