Santiago de Alcántara Wastewater Treatment Plant | Extremadura, Spain

The Santiago de Alcántara wastewater treatment plant is located in the municipality of Santiago de Alcántara, in the province of Cáceres, Extremadura, Spain. It serves a population of approximately 3,300 residents, classifying it as a small agglomeration under EU regulations. The plant is situated inland, away from coastal areas, and its operations are part of the regional wastewater management infrastructure. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. It has a designed capacity of 2,100 m³/day and currently treats an average daily flow of 598.12 m³/day, indicating ample reserve capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local watercourse, 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, emptying into the Atlantic Ocean near Lisbon. The plant's operations help protect the local aquatic environment and downstream water quality in the Tagus basin.

The plant discharges into a tributary of the Tagus River, which flows through the Extremadura region and into Portugal before reaching the Atlantic Ocean. The Tagus basin supports diverse aquatic life and is an important ecological corridor. The plant's secondary treatment reduces organic pollutants, helping to maintain water quality in the river system and protect downstream habitats.