RENEDO Wastewater Treatment Plant, Renedo de Esgueva, Castilla y León, Spain

RENEDO is a wastewater treatment plant located in Renedo de Esgueva, a municipality in the province of Valladolid, within the autonomous community of Castilla y León, Spain. The plant serves a population of approximately 8,504 people, classifying it as a small to medium agglomeration under Spanish and European regulations. The plant operates with secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. Treated effluent from RENEDO is discharged into the local water system, which ultimately drains into the Duero River basin. The Duero River flows westward through Spain and into Portugal, emptying into the Atlantic Ocean. The plant plays a key role in protecting the Esgueva River and downstream water quality in the Duero basin.

The plant discharges into the Esgueva River, a tributary of the Pisuerga River, which joins the Duero River. The Duero basin is one of the largest in the Iberian Peninsula, supporting diverse aquatic ecosystems and agricultural water use. Downstream, the river flows through Portugal to the Atlantic Ocean. The region's Mediterranean-continental climate means river flows can vary seasonally, making consistent wastewater treatment important for maintaining ecological balance.