Alcuéscar Wastewater Treatment Plant, Alcuéscar, Extremadura, Spain

The Alcuéscar wastewater treatment plant is located in the town of Alcuéscar, in the province of Cáceres, Extremadura, Spain. It serves a population of approximately 5,400 residents, making it a small-scale municipal facility. The plant is situated inland, away from coastal areas, and its operations are integral to local sanitation. The plant provides secondary treatment, which is the standard biological treatment required under the EU 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. The plant has a designed capacity of 4,931 cubic meters per day and currently discharges an average volume of 978.74 cubic meters per day, indicating it operates well below its capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Tagus River basin, one of the major river systems in the Iberian Peninsula. The Tagus River flows westward through Spain and Portugal before emptying into the Atlantic Ocean near Lisbon. The plant's operations help protect the water quality of this important river system and its downstream ecosystems.

The plant discharges into the local watershed, which is part of the Tagus River basin. The Tagus River is the longest river in the Iberian Peninsula, supporting diverse aquatic life and providing water for agriculture and human consumption. Downstream, the river flows through the Alentejo region in Portugal and forms the Tagus Estuary, a vital habitat for migratory birds and fish species. The plant's secondary treatment helps reduce nutrient and organic pollution, contributing to the ecological health of this transboundary river system.