Impianto C da Fretti Wastewater Treatment Plant, Alessandria della Rocca, Sicily

Impianto C da Fretti is a municipal wastewater treatment plant located in Alessandria della Rocca, a town in the province of Agrigento, Sicily, Italy. The plant serves a population of about 4,000 people, reflecting the scale of a small agglomeration in the Sicilian interior. The plant provides secondary treatment, which is the standard biological treatment stage required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland freshwater discharges from agglomerations of this size. The designed capacity of 4,000 m³/day aligns with the population served, indicating the facility is appropriately scaled for local needs. The treated effluent is discharged into the local hydrological network, which ultimately drains into the Mediterranean Sea via the Platani River basin. The plant plays a key role in protecting downstream water quality and supporting the ecological health of the region's waterways.

The plant discharges into the Platani River basin, which flows through the Sicilian interior before reaching the Mediterranean Sea near the coast of Agrigento. The downstream environment supports diverse aquatic life and is part of a semi-arid Mediterranean landscape where water resources are ecologically sensitive. Effective treatment helps prevent nutrient enrichment and maintains water quality in the river and coastal zone.