Capparuccia_GRZ_DEP Wastewater Treatment Plant, Grottazzolina, Marche, Italy

Capparuccia_GRZ_DEP is a municipal wastewater treatment plant located in Grottazzolina, in the province of Fermo, Marche region, Italy. The plant serves a population of approximately 1,142 people, classifying it as a small agglomeration under Italian and European regulations. It is situated inland, more than 10 km from the Adriatic coast, but within 50 km of the coastline. The plant provides secondary treatment, which is the standard level required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The designed capacity is 2,500 m³/day, and the current discharge volume is 524.50 m³/day, indicating that the plant operates well below its design capacity. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated effluent is discharged into a local watercourse that ultimately drains into the Adriatic Sea. The plant plays a key role in protecting the local watershed and the downstream marine environment from nutrient pollution and pathogens. Its operation supports the ecological health of the region's rivers and coastal waters, which are important for tourism and fisheries.

The plant discharges into a tributary of the Tenna River basin, which flows into the Adriatic Sea near Porto Sant'Elpidio. The Adriatic Sea is a semi-enclosed basin with sensitive coastal ecosystems, including seagrass meadows and nursery habitats for fish. The secondary treatment provided by the plant reduces organic load and suspended solids, helping to prevent eutrophication and maintain water quality in the downstream river and coastal zone.