S_NICOLA Wastewater Treatment Plant, Molito, Lazio, Italy

S_NICOLA is an advanced wastewater treatment plant located in the municipality of Molito, within the province of Frosinone in the Lazio region of Italy. The plant serves a population of approximately 1,200 residents, classifying it as a small agglomeration under Italian and EU regulations. Its location in the Apennine foothills places it in a rural, inland setting. 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. This level of treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant has a designed capacity of 1,200 m³/day and currently discharges 237.56 m³/day of treated wastewater, indicating significant spare capacity. The treated effluent is discharged into a local watercourse that eventually drains into the Liri River, a major river in central Italy that flows into the Tyrrhenian Sea. The plant's advanced treatment helps safeguard the ecological health of the Liri River basin, which supports diverse aquatic life and is used for irrigation and recreation downstream.

The plant discharges into a tributary of the Liri River, which flows through the Lazio region before entering the Tyrrhenian Sea near Minturno. The Liri River basin is an ecologically sensitive area that supports fish populations and provides habitat for migratory birds. Advanced treatment at this plant helps reduce nutrient loading, protecting downstream water quality and the marine environment of the Tyrrhenian Sea.