RUBI Wastewater Treatment Plant, Castellbisbal, Catalunya, Spain

The RUBI wastewater treatment plant is located in Castellbisbal, a municipality in the Vallès Occidental comarca of Barcelona, Catalunya, Spain. The plant serves a population equivalent of 84,226, placing it in the medium-to-large agglomeration category under EU classification. As part of Spain's wastewater infrastructure, it contributes to the treatment of domestic and industrial wastewater from the surrounding urban area. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent between 10,000 and 150,000 are required to provide secondary treatment as a minimum. For larger agglomerations or those discharging into sensitive areas, tertiary treatment may be required. The plant's designed capacity is 1.00 (likely in cubic meters per second or similar unit), indicating a substantial treatment capability. The treated effluent from the plant is discharged into the local water system, which ultimately drains into the Mediterranean Sea via the Llobregat River basin. The Llobregat River is a key water resource for the Barcelona metropolitan area and supports diverse aquatic life. The plant's operation is critical for protecting downstream water quality and the ecological health of the river and coastal environment.

The RUBI plant discharges into the Llobregat River basin, which flows through Catalunya and empties into the Mediterranean Sea near Barcelona. The Llobregat River supports a variety of fish species and provides habitat for migratory birds. The river's delta is an ecologically sensitive area that relies on adequate wastewater treatment to prevent nutrient pollution and maintain water quality for both human use and biodiversity.