CARPIO Wastewater Treatment Plant, Carpio, Valladolid, Spain

The CARPIO wastewater treatment plant is located in Carpio, a municipality in the province of Valladolid, within the autonomous community of Castilla y León, Spain. The plant serves a population of approximately 3,000 residents and is designed with a capacity of 3,000 cubic meters per day. The plant provides secondary treatment, which is the standard biological treatment required under the European Union's 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, ensuring compliance with EU effluent standards. The treated wastewater 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's operation helps protect the water quality of the Duero basin, supporting aquatic life and downstream ecosystems.

The CARPIO plant discharges into the Duero River basin, a major hydrological system in the Iberian Peninsula. The Duero River flows through diverse landscapes, including agricultural areas and natural habitats, before reaching the Atlantic Ocean. The plant's secondary treatment reduces organic pollutants and nutrients, helping to maintain the ecological balance of the river and its tributaries, which support fish populations and migratory birds.