GRANEN Wastewater Treatment Plant, Grañén, Huesca, Aragón, Spain

GRANEN is a wastewater treatment plant located in Grañén, within the province of Huesca in the autonomous community of Aragón, Spain. The facility serves a population of approximately 3,730 residents and has a designed capacity of 4,000 cubic meters per day, with a reported discharge volume of 676.05 cubic meters per day. The plant operates at the secondary treatment level, which is the standard required by the European Union's Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, ensuring compliance with EU effluent standards before discharge. The treated effluent is discharged into the local watershed, which ultimately drains into the Ebro River basin. The Ebro River is one of Spain's major rivers, flowing into the Mediterranean Sea. The plant's operations help protect downstream water quality and support the ecological health of the Ebro basin, which is important for agriculture and biodiversity in the region.

The plant discharges into the Ebro River basin, which flows through northeastern Spain and empties into the Mediterranean Sea via the Ebro Delta. The delta is an ecologically sensitive area that supports diverse aquatic life and migratory birds. The plant's secondary treatment helps reduce nutrient and pollutant loads, mitigating eutrophication risks in the river and coastal waters.