Impianto C. Da Vurgi - Secondary Wastewater Treatment Plant in Petralia Sottana, Sicily

Impianto C. Da Vurgi is a municipal wastewater treatment plant located in the Quartiere Casale area of Petralia Sottana, a town in the province of Palermo, Sicily, Italy. The plant serves a population of approximately 4,250 residents, classifying it as a small agglomeration under Italian and EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland freshwater discharges from agglomerations of this size. With a designed capacity of 8,800 cubic meters per day and an average daily discharge volume of 841 cubic meters, the plant operates well below its capacity, indicating room for future growth or seasonal variability. The treated effluent is discharged into the local watershed, which ultimately drains into the Mediterranean Sea. As an inland plant more than 10 km from the coast, its discharge contributes to the health of local streams and rivers that support diverse aquatic life in Sicily's mountainous terrain. The plant plays a key role in protecting water quality in the region, particularly in the context of EU directives aimed at reducing nutrient pollution and safeguarding downstream ecosystems.

The plant discharges into the local drainage basin of northern Sicily, which flows through small rivers and streams toward the Tyrrhenian Sea. This watershed supports Mediterranean aquatic habitats, including seasonal watercourses and riparian zones that provide refuge for native fish and amphibian species. The secondary treatment process reduces organic load and suspended solids, helping to maintain water quality in downstream water bodies that are ecologically sensitive due to the region's semi-arid climate and limited freshwater resources.