ABEJAR Wastewater Treatment Plant, Abejar, Castilla y León, Spain

The ABEJAR wastewater treatment plant is located in Abejar, a municipality in the province of Soria, within the autonomous community of Castilla y León, Spain. The plant serves a population of approximately 3,500 residents, reflecting its role in managing domestic wastewater for this small inland community. The facility employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 3,500 m³/day and an actual discharge volume of 273.97 m³/day, the plant operates well within its capacity, ensuring effective treatment of local wastewater. 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 near Porto. The advanced treatment level helps protect the ecological health of the receiving water bodies and supports the region's water quality objectives.

The plant discharges into the Duero River basin, which flows through the Iberian Peninsula and supports diverse aquatic ecosystems. The Duero is a major river in Spain and Portugal, providing habitat for species such as the Iberian barbel and the European eel. Advanced treatment at this facility helps reduce nutrient loading and protects downstream water quality in the river and its estuary.