SENALES Wastewater Treatment Plant, Welsberg-Taisten, South Tyrol

The SENALES wastewater treatment plant is located in the Pustertal valley (Val Pusteria) in the municipality of Welsberg-Taisten (Monguelfo-Tesido), within the autonomous province of Bolzano - Bozen, Trentino-Alto Adige/Südtirol, Italy. The plant serves a population of approximately 4,317 residents in this Alpine region. The plant operates with secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations between 2,000 and 10,000 population equivalent discharging into freshwater. Its designed capacity of 4,800 m³/day is well above the current discharge volume of 854.61 m³/day, indicating spare capacity for future growth. The treated effluent is discharged into local watercourses that drain into the Rienza River (Rienza), a tributary of the Eisack (Isarco) River, which flows into the Adige River near Bolzano. The Adige eventually reaches the Adriatic Sea. The plant plays a key role in protecting the sensitive Alpine watershed and downstream ecosystems, including the Adige River basin.

The plant discharges into the Rienza River, a tributary of the Eisack River, which joins the Adige River near Bolzano. The Adige is Italy's second-longest river and flows into the Adriatic Sea. The Alpine watershed is ecologically sensitive, supporting diverse aquatic life and providing important habitats for species such as the marble trout. The plant's secondary treatment helps reduce nutrient loads and protect water quality in this fragile mountain environment.