Cubelles i Cunit Wastewater Treatment Plant, Cubelles, Catalonia

The Cubelles i Cunit wastewater treatment plant is a municipal facility serving the town of Cubelles in the Garraf region of Catalonia, Spain. With a population equivalent of 24,302, it falls under the EU classification of a medium agglomeration, requiring secondary treatment as a minimum under the Urban Waste Water Treatment Directive (91/271/EEC). The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating it is sized to handle the local wastewater load. As a Spanish facility, the plant operates within the national regulatory framework that transposes the EU UWWTD. For agglomerations between 10,000 and 150,000 PE, secondary treatment is mandatory, with tertiary treatment required if the discharge enters sensitive areas. Standard practice for this scale in Catalonia involves biological treatment with activated sludge or similar technology. The plant's discharge ultimately reaches the Mediterranean Sea, likely via the Foix River or a coastal outfall. The receiving waters support diverse marine life and are part of the broader Catalan coastal ecosystem. The region's Mediterranean climate means seasonal variations in flow, with higher tourist populations in summer potentially stressing the system. Proper treatment is essential to protect coastal water quality and bathing areas.

The Cubelles i Cunit plant discharges into the Mediterranean Sea, likely via the Foix River or a direct coastal outfall. The downstream environment includes the Catalan coast, which supports seagrass meadows, fish nurseries, and migratory bird routes. The area is ecologically sensitive due to its proximity to the Garraf Massif and coastal wetlands, which rely on good water quality for biodiversity.