MACCHIONE Wastewater Treatment Plant, Villa Santo Stefano, Lazio, Italy

MACCHIONE is a wastewater treatment plant located in the Pietracupa area of Villa Santo Stefano, in the province of Frosinone, Lazio, Italy. It serves a small community of 800 people, reflecting its role in managing domestic wastewater for this inland town. The plant is situated in a region characterized by hilly terrain and a Mediterranean climate, with agriculture and light industry in the vicinity. 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) to protect sensitive receiving waters. The designed capacity of 800 m³/day matches the population served, indicating adequate infrastructure for current loads. The treated effluent is discharged into local watercourses that ultimately drain into the Tyrrhenian Sea via the Liri-Garigliano river system. This downstream connection to a major sea basin underscores the importance of maintaining high treatment standards to prevent eutrophication and protect coastal water quality. The plant's advanced treatment helps safeguard the ecological health of the region's rivers and the marine environment.

The plant discharges into local streams that feed into the Liri River, which flows into the Garigliano River and then into the Tyrrhenian Sea near the Gulf of Gaeta. This watershed supports diverse aquatic life and is an important corridor for migratory fish species. The advanced treatment at MACCHIONE helps reduce nutrient loads, mitigating the risk of algal blooms in the downstream coastal zone.