Castelgrande S. Maria di Costantinopoli Wastewater Treatment Plant, Castelgrande, Basilicata

Castelgrande S. Maria di Costantinopoli is a wastewater treatment plant located in Castelgrande, a municipality in the province of Potenza, Basilicata, Italy. The plant serves a population of approximately 1,000 residents, reflecting its role in managing domestic wastewater for this small inland community. As part of Italy's wastewater infrastructure, it contributes to the sanitation and environmental protection of the region. The plant provides secondary treatment, which typically involves biological processes to reduce organic matter and suspended solids. With a designed capacity of 1,300 cubic meters per day and an actual discharge volume of about 198 cubic meters per day, the plant operates well below its capacity, indicating potential for future growth or seasonal variations. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this size (under 2,000 population equivalent) are generally required to provide appropriate treatment, and secondary treatment meets the standard for sensitive areas. The treated effluent is discharged into local watercourses that eventually drain into the Ionian Sea via the Basento or similar river systems. The plant's operation helps protect the water quality of these streams, which support aquatic life and are used for irrigation and recreation. By reducing pollutant loads, the plant plays a key role in safeguarding the ecological health of the Basilicata region's watershed.

The plant discharges into local streams that flow into the Basento River, which drains into the Gulf of Taranto in the Ionian Sea. This watershed supports diverse aquatic habitats and is important for agriculture and biodiversity in the Basilicata region. The secondary treatment provided helps minimize nutrient and organic pollution, protecting downstream water quality and the marine environment.