DEP_COM_OSTERIA Wastewater Treatment Plant, Colonna, Lazio, Italy

DEP_COM_OSTERIA is an advanced wastewater treatment plant located in Colonna, a town in the Metropolitan City of Rome, Lazio region, Italy. The plant serves a population of approximately 4,000 residents and has a designed capacity of 4,300 cubic meters per day, with an average discharge volume of 791.86 cubic meters per day. As an advanced treatment facility, it goes beyond secondary treatment to remove nutrients and other pollutants, aligning with the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for sensitive areas. The plant's scale places it in the small agglomeration category, for which the directive mandates appropriate treatment based on receiving water sensitivity. The plant's treated effluent is discharged into local watercourses that eventually drain into the Tyrrhenian Sea via the Tiber River basin. This contributes to protecting the water quality of the Tiber and the coastal marine environment, which supports diverse aquatic life and recreational activities.

The plant discharges into the Tiber River basin, which flows through Rome and into the Tyrrhenian Sea. The Tiber is the third-longest river in Italy and supports a variety of fish species and migratory birds. The coastal area near the Tiber delta is ecologically sensitive, hosting important habitats for marine life. Advanced treatment helps reduce nutrient loading, preventing eutrophication in the coastal zone.