Sierra de Fuentes Wastewater Treatment Plant - Secondary Treatment in Extremadura, Spain

The Sierra de Fuentes wastewater treatment plant is located in the municipality of Sierra de Fuentes, in the province of Cáceres, Extremadura, Spain. It serves a population of approximately 2,900 residents, classifying it as a small agglomeration under European Union regulations. The plant is situated inland, away from coastal areas, and its operations are part of the regional water management infrastructure. The plant provides secondary treatment, which is the standard biological treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into freshwater bodies. The designed capacity of the plant is 3,667 cubic meters per day, and it currently discharges an average of 525.62 cubic meters per day, indicating ample capacity for future growth. The treatment process involves biological degradation of organic matter, followed by sedimentation to remove solids. The treated effluent is discharged into local watercourses that eventually drain 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 plays a key role in protecting the local aquatic environment and downstream water quality in the Tagus basin.

The plant discharges into small streams that feed into the Tagus River basin, which ultimately drains into the Atlantic Ocean. The Tagus River supports diverse aquatic life and is an important water resource for agriculture and urban supply in central Spain and Portugal. The plant's secondary treatment helps reduce organic pollution and nutrient loads, protecting the ecological health of the receiving waters.