SEPULVEDA Wastewater Treatment Plant, Sepúlveda, Castilla y León, Spain

SEPULVEDA is a municipal wastewater treatment plant located in Sepúlveda, a town in the province of Segovia, within the autonomous community of Castilla y León, Spain. The plant serves a population of approximately 3,000 residents and has a designed capacity of 3,000 cubic meters per day. 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. The directive mandates secondary treatment for all discharges from agglomerations with a population equivalent greater than 2,000, ensuring compliance with European environmental standards. The treated effluent is discharged into the local watershed, which ultimately drains into the Duero River basin. The Duero River flows westward through Spain and Portugal, emptying into the Atlantic Ocean at Porto. The plant plays a key role in protecting the water quality of the Duero basin and downstream ecosystems.

The plant discharges into the Duero River basin, which is the largest river basin in the Iberian Peninsula. The Duero River supports diverse aquatic life and is an important water resource for agriculture and human consumption. Downstream, the river flows through the Arribes del Duero Natural Park before reaching the Atlantic Ocean, where it contributes to the coastal ecosystem.