Hainersdorf Wastewater Treatment Plant - Neudorf bei Ilz, Steiermark, Austria

Hainersdorf wastewater treatment plant is located in Neudorf bei Ilz, a municipality in the district of Hartberg-Fürstenfeld, Steiermark, Austria. The plant serves a population of approximately 1,799 and has a designed capacity of 2,000 m³/day, with a current discharge volume of 287 m³/day. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The treated effluent is discharged into local watercourses that eventually drain into the Danube River basin. The plant plays a key role in maintaining water quality in the region, supporting aquatic life and downstream ecosystems.

The plant discharges into small streams that flow into the Raab River, a tributary of the Danube. The Danube ultimately reaches the Black Sea. The region's water bodies support diverse aquatic life, including fish species such as brown trout and grayling. Advanced treatment helps minimize nutrient loading, protecting downstream habitats from eutrophication.