Madonna del Piano Wastewater Treatment Plant, Castro dei Volsci, Lazio, Italy

Madonna del Piano is an advanced wastewater treatment plant located in Castro dei Volsci, in the Lazio region of Italy. The plant serves a population of approximately 3,420 people and has a designed capacity of 5,000 m³/day, with an average discharge volume of 677.04 m³/day. It operates under Italy's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for agglomerations of this scale. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. This level of treatment is typical for plants discharging into sensitive areas or where higher water quality standards are required. The plant's capacity utilization is well within its design limits, indicating efficient operation. The treated effluent is discharged into the local watershed, which ultimately drains into the Tyrrhenian Sea via the Liri-Garigliano river system. The region's water bodies support diverse aquatic life and are important for local agriculture and tourism. Advanced treatment helps protect downstream ecosystems and maintain water quality in the sensitive Mediterranean coastal environment.

The plant discharges into the Liri-Garigliano river basin, which flows through central Italy and empties into the Tyrrhenian Sea near the Gulf of Gaeta. This coastal area supports diverse marine life and is an important ecological zone. The advanced treatment provided by Madonna del Piano helps reduce nutrient loading and protects downstream water quality, which is critical for both aquatic habitats and human uses such as recreation and fishing.