Forni di Sopra Loc Nagri Wastewater Treatment Plant - Secondary Treatment in Friuli-Venezia Giulia

Forni di Sopra Loc Nagri is a municipal wastewater treatment plant located in the Alpine community of Forni di Sopra, in the Friuli-Venezia Giulia region of northeastern Italy. The plant serves a population of approximately 1,400 residents, reflecting the small-scale nature of this mountain settlement. Its location in the upper Tagliamento River valley places it within a sensitive Alpine environment. 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 with a population equivalent between 2,000 and 10,000. With a designed capacity of 2,700 m³/day and an actual discharge volume of 540 m³/day, the facility operates well below its capacity, indicating adequate headroom for current loads. The plant's effluent is discharged into the local watercourse, which ultimately feeds into the Tagliamento River. The Tagliamento River is one of the last morphologically intact river systems in the Alps, known for its braided channels and high ecological value. The plant's secondary treatment helps protect this river's water quality, supporting aquatic life and downstream ecosystems. The facility operates under Italy's implementation of the EU UWWTD, with regulatory oversight from regional environmental authorities.

The plant discharges treated wastewater into a tributary of the Tagliamento River, which flows south through Friuli-Venezia Giulia into the Adriatic Sea near Lignano Sabbiadoro. The Tagliamento is ecologically significant as one of Europe's last remaining dynamic Alpine rivers, supporting diverse habitats for fish, invertebrates, and riparian vegetation. The plant's secondary treatment helps maintain water quality in this sensitive watershed, which is important for both biodiversity and downstream recreational uses.