Paterno Calabro Spadolette Wastewater Treatment Plant, Calabria, Italy

Paterno Calabro Spadolette is a wastewater treatment plant located in Paterno Calabro, a municipality in the province of Cosenza, Calabria, Italy. The plant serves a small population of approximately 200 residents, reflecting the rural character of the area. It is situated inland, more than 10 km from the coast but within 50 km of the Tyrrhenian Sea. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent (PE) of less than 2,000. With a designed capacity of 350 m³/day and an average daily discharge of 39.59 m³/day, the plant operates well below its capacity, indicating it is sized to accommodate future growth or seasonal variations. Secondary treatment typically involves biological oxidation and sedimentation to reduce organic matter and suspended solids. The treated effluent is discharged into a local watercourse that eventually drains into the Tyrrhenian Sea. The plant plays a key role in protecting the local watershed and downstream ecosystems from untreated sewage. Given its small scale and inland location, the environmental impact is localized, but proper operation is essential to maintain water quality in the receiving streams and the coastal marine environment.

The plant discharges into a small stream that flows through the Calabrian Apennines and eventually reaches the Tyrrhenian Sea. This coastal region supports diverse marine life and is important for local fisheries and tourism. The watershed is characterized by steep terrain and Mediterranean climate, with seasonal rainfall that can affect stream flow and dilution capacity. Protecting the water quality in these streams is vital for the ecological health of the downstream coastal zone.