FORTIDICO Wastewater Treatment Plant, Vallecorsa, Lazio, Italy

FORTIDICO is a wastewater treatment plant located in Vallecorsa, a municipality in the province of Frosinone, Lazio, Italy. The plant serves a population of approximately 3,100 people, reflecting a small to medium agglomeration under Italian and EU classifications. Its designed capacity of 4,000 m³/day indicates it is sized to accommodate local residential flows. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) and additional polishing steps, ensuring high-quality effluent. The plant discharges an average of 613.69 m³/day of treated wastewater, suggesting a capacity utilization of about 15%, which may reflect seasonal variations or future capacity planning. The treated effluent is discharged into local watercourses that ultimately drain into the Tyrrhenian Sea via the Liri-Garigliano river system. This region is part of the broader Lazio watershed, which supports diverse aquatic habitats and agricultural activities. The advanced treatment level helps protect downstream water quality and the sensitive coastal environment of the Tyrrhenian Sea.

The plant discharges into the Liri-Garigliano river basin, which flows into the Tyrrhenian Sea near the Gulf of Gaeta. This coastal area supports diverse marine life and is important for local fisheries and tourism. The advanced treatment process reduces nutrient loads, helping to prevent eutrophication in the downstream river and coastal waters, which are ecologically sensitive due to their role as spawning and nursery grounds for fish species.