Impianto C da Vallone della Fiera | Secondary Wastewater Treatment Plant in Castronovo di Sicilia, Sicily

Impianto C da Vallone della Fiera is a municipal wastewater treatment plant located in Castronovo di Sicilia, a town in the province of Palermo, Sicily, Italy. The plant serves a population of approximately 3,440 residents, classifying it as a small agglomeration under Italian and EU regulations. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland freshwater discharges from agglomerations of this size. The designed capacity is 4,588 m³/day, with a reported discharge volume of 681 m³/day, indicating operational headroom. The treated effluent is discharged into the local watershed, which ultimately drains into the Mediterranean Sea. The plant plays a key role in protecting the region's water quality, supporting both local ecosystems and downstream coastal environments.

The plant discharges into the inland drainage system of Sicily, which flows into the Mediterranean Sea. The surrounding watershed supports diverse aquatic life and is important for regional biodiversity. The secondary treatment process helps reduce organic pollutants and nutrients, mitigating eutrophication risks in downstream coastal waters.