S_MARCO_VECCHIO_PTR_DEP Wastewater Treatment Plant, Passo di Treia, Italy

S_MARCO_VECCHIO_PTR_DEP is an advanced wastewater treatment plant located in Passo di Treia, a frazione of Treia in the Macerata province of Italy. The plant serves a small population of 323 residents, reflecting its role in a rural community within the Marche region. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 250 m³/day and a current discharge volume of 63.94 m³/day, the facility operates well below its capacity. As an Italian plant, it falls under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for sensitive areas. The treated effluent is discharged into local watercourses that ultimately drain into the Adriatic Sea via the Potenza River basin. The Marche region's rivers support diverse aquatic ecosystems, and advanced treatment helps protect downstream water quality in the Adriatic coastal zone.

The plant discharges into the Potenza River basin, which flows eastward through the Marche region into the Adriatic Sea. The Adriatic Sea is a semi-enclosed basin with sensitive coastal ecosystems, including seagrass meadows and nursery habitats for fish. Advanced treatment at this plant reduces nutrient loading, helping to mitigate eutrophication risks in the coastal marine environment.