OSOPPO_CAPOLUOGO Wastewater Treatment Plant, Osoppo, Friuli-Venezia Giulia

OSOPPO_CAPOLUOGO is a wastewater treatment plant located in Osoppo, in the Friuli-Venezia Giulia region of northeastern Italy. The facility serves a small population of approximately 977 residents and has a designed capacity of 2,500 cubic meters per day, with an actual discharge volume of 963.02 cubic meters per day. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for all discharges from agglomerations with a population equivalent above 2,000, and for sensitive areas, more stringent treatment may be required. Although Osoppo is below this threshold, the plant still meets secondary treatment standards. The treated effluent is discharged into local watercourses that ultimately drain into the Adriatic Sea via the Tagliamento River basin. The region is known for its karst topography and rich biodiversity, and the plant plays a role in protecting downstream water quality and aquatic ecosystems.

The plant discharges into the local drainage network that feeds into the Tagliamento River, one of the last morphologically intact river systems in the Alps. The Tagliamento flows into the Adriatic Sea near the Gulf of Venice, supporting diverse habitats including gravel-bed rivers, wetlands, and coastal lagoons. The area is ecologically sensitive, hosting species such as the marble trout and various migratory birds. Proper wastewater treatment is essential to prevent nutrient enrichment and maintain the ecological integrity of this dynamic river system.