S_Angelo_dei_Lombardi_Impianto_Localita_Patetto Wastewater Treatment Plant, Sant'Angelo dei Lombardi, Campania

S_Angelo_dei_Lombardi_Impianto_Localita_Patetto is a municipal wastewater treatment plant located in Sant'Angelo dei Lombardi, in the province of Avellino, Campania, Italy. The plant serves a small community of about 1,000 people and 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 of this size. The directive mandates secondary treatment for all discharges from agglomerations with a population equivalent (PE) between 2,000 and 10,000, and this plant, serving 1,000 PE, falls below that threshold, yet still employs secondary treatment. The plant has a designed capacity of 1,200 m³/day and currently discharges approximately 198 m³/day of treated effluent. The treated wastewater is discharged into local watercourses that eventually drain into the Tyrrhenian Sea. The plant plays a key role in protecting the local watershed, which includes the Ofanto River basin, from untreated sewage. By providing secondary treatment, it reduces organic load and suspended solids, helping to maintain water quality in the region's rivers and coastal waters.

The plant discharges into the local drainage network that feeds into the Ofanto River, one of the major rivers in Campania, which flows into the Tyrrhenian Sea. The Ofanto River supports diverse aquatic life and is an important ecological corridor in southern Italy. The region's Mediterranean climate and hilly terrain make the watershed sensitive to pollution, and the plant's secondary treatment helps protect downstream ecosystems from nutrient enrichment and organic pollution.