Viana de Cega Wastewater Treatment Plant, Castilla y León | Advanced Treatment

The Viana de Cega wastewater treatment plant is located in the municipality of Viana de Cega, Valladolid, in the autonomous community of Castilla y León, Spain. The plant serves a population of 5,319 and operates with advanced treatment technology, ensuring high-quality effluent for environmental protection. As a facility in Spain, the plant operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. Advanced treatment goes beyond secondary, often including nutrient removal to protect sensitive water bodies. The plant's designed capacity of 10,401 m³/day indicates it is sized to accommodate future growth or seasonal peaks. The treated effluent is discharged into the local water system, which ultimately drains into the Duero River basin. The Duero River flows westward through Spain and Portugal, emptying into the Atlantic Ocean. The advanced treatment helps protect the ecological health of the Duero basin, which supports diverse aquatic life and agricultural activities downstream.

The plant discharges into the Duero River basin, which flows through the Castilla y León region and into Portugal before reaching the Atlantic Ocean. The Duero basin is ecologically significant, supporting diverse fish populations and riparian habitats. Advanced treatment at this plant helps reduce nutrient loading, protecting downstream water quality and aquatic ecosystems.