PIGNA Wastewater Treatment Plant, Pigna, Liguria, Italy

PIGNA is a wastewater treatment plant located in Pigna, a municipality in the Province of Imperia, Liguria, Italy. The plant serves a population of approximately 2,500 and is situated in a hilly inland area near the border with France. As part of Italy's wastewater infrastructure, it plays a key role in managing domestic sewage for this small agglomeration. 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 designed capacity is 2,500 m³/day, and the average discharge volume is around 495 m³/day, indicating that the plant operates well below its capacity. This suggests potential for future population growth or seasonal variations. The treated effluent is discharged into local watercourses that eventually flow toward the Ligurian Sea, part of the Mediterranean basin. The region's steep terrain and proximity to the coast mean that effective treatment is essential to protect downstream aquatic ecosystems and coastal water quality. The plant contributes to safeguarding the ecological health of the area's rivers and marine environment.

The plant discharges into small streams that drain into the Ligurian Sea, a semi-enclosed basin of the Mediterranean. The coastal waters near Pigna support diverse marine life and are important for tourism and fisheries. Effective secondary treatment helps reduce nutrient loads and organic pollution, protecting seagrass meadows and preventing eutrophication in the coastal zone.