MOZONCILLO Wastewater Treatment Plant, Mozoncillo, Segovia, Spain

MOZONCILLO is a wastewater treatment plant located in the municipality of Mozoncillo, within the province of Segovia in the autonomous community of Castilla y León, Spain. The plant serves a population of around 2,642 residents, reflecting its role in managing domestic wastewater for this small inland community. The plant operates with 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 populations between 2,000 and 10,000 in inland areas, ensuring effective removal of organic matter and suspended solids before discharge. 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 into Portugal, reaching the Atlantic Ocean near Porto. The plant's operations help protect the water quality of the Duero basin, which supports agricultural irrigation and aquatic ecosystems in the region.

The plant discharges into the Duero River basin, a major hydrological system in northern Spain that flows into the Atlantic Ocean. The Duero basin supports diverse aquatic life and is important for regional agriculture. The secondary treatment provided by the plant helps reduce nutrient and organic loads, protecting downstream water quality in this semi-arid region where water resources are carefully managed.