Selzthal Wastewater Treatment Plant, Neulassing, Steiermark, Austria

The Selzthal wastewater treatment plant is located in Neulassing, a locality within the municipality of Selzthal in the district of Liezen, Steiermark, Austria. The plant serves a population of approximately 1,491 and is part of the region's municipal wastewater infrastructure. 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. With a designed capacity of 3,400 m³/day and a current discharge volume of 370 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local water bodies that ultimately drain into the Enns River, a tributary of the Danube. The Danube River basin is a major European watershed, supporting diverse aquatic ecosystems and providing water for millions of people. The advanced treatment helps protect downstream water quality in this sensitive river system.

The plant discharges into the Enns River catchment, which flows into the Danube River and eventually reaches the Black Sea. The Danube basin is ecologically significant, supporting a wide range of fish species and migratory birds. Advanced treatment at this plant helps reduce nutrient loads and protect the downstream aquatic environment.