S_ONOFRIO Wastewater Treatment Plant, Alvito, Lazio, Italy

S_ONOFRIO is an advanced wastewater treatment plant located in the Sant'Onofrio area of Alvito, a town in the province of Frosinone, Lazio, Italy. The plant serves a population of approximately 600 people, making it a small-scale facility dedicated to treating municipal wastewater from this rural community. As an advanced treatment plant, S_ONOFRIO goes beyond secondary treatment to remove nutrients and other pollutants, ensuring high-quality effluent. With a designed capacity of 600 cubic meters per day and a discharge volume of about 118.78 cubic meters per day, the plant operates well within its capacity. It falls under Italy's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for agglomerations of this size. The treated effluent is discharged into the local water system, which ultimately drains into the Liri River basin and then to the Tyrrhenian Sea. This advanced treatment helps protect downstream water quality and supports the ecological health of the region's rivers and coastal waters.

The plant discharges into the Liri River basin, which flows through central Italy and eventually reaches the Tyrrhenian Sea. This watershed supports diverse aquatic life and is important for regional biodiversity. The advanced treatment at S_ONOFRIO helps reduce nutrient loading and protects downstream habitats from eutrophication and pollution.