Pichl Preunegg Wastewater Treatment Plant, Schladming, Austria

Pichl Preunegg is an advanced wastewater treatment plant located in Schladming, Steiermark, Austria. The plant serves a population of approximately 5,982 people and has a designed capacity of 14,000 m³/day, indicating it is sized to accommodate seasonal population fluctuations typical of alpine tourist destinations. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients such as nitrogen and phosphorus. As an Austrian facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for discharges into sensitive areas. The plant's current discharge volume is 916.74 m³/day, well within its capacity. The treated effluent is discharged into local watercourses that ultimately drain into the Enns River, a major tributary of the Danube. The Danube flows into the Black Sea, making this plant part of a large transboundary river basin. The advanced treatment helps protect downstream aquatic ecosystems and supports water quality in the sensitive alpine region.

The plant discharges into the Enns River watershed, which flows into the Danube and eventually the Black Sea. The region is ecologically sensitive due to its alpine character and tourism pressure. Advanced treatment ensures minimal nutrient loading, protecting downstream habitats and supporting biodiversity in the Enns and Danube basins.