Overview
Duruelo de la Sierra wastewater treatment plant in Castilla y León, Spain, serves 3,000 people with advanced treatment. It discharges 474.66 m³/day into the local watershed, supporting the Duero River basin.
The Duruelo de la Sierra wastewater treatment plant is located in the municipality of Duruelo de la Sierra, in the province of Soria, Castilla y León, Spain. It serves a population of approximately 3,000 residents, reflecting a small to medium agglomeration typical of rural inland communities in this region. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. This level of treatment ensures high-quality effluent, particularly important for protecting sensitive receiving waters. The designed capacity of 3,000 m³/day matches the population served, with a current discharge volume of 474.66 m³/day, indicating operational headroom. 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 advanced treatment helps safeguard the ecological health of this important river system, which supports diverse aquatic life and agricultural uses downstream.
Environmental context
The plant discharges into the Duero River basin, a major Iberian watershed that flows into the Atlantic Ocean. The Duero River and its tributaries support a variety of fish species, including migratory trout and barbel, and provide water for irrigation in the surrounding agricultural areas. The advanced treatment level helps minimize nutrient loading and protects the river's ecological balance, particularly in the context of the region's continental Mediterranean climate with seasonal droughts.
Frequently asked questions
The plant is located in Duruelo de la Sierra, in the province of Soria, Castilla y León, Spain.
The plant serves approximately 3,000 residents, classifying it as a small agglomeration under EU wastewater directives.
The plant discharges treated effluent into the local watershed, which flows into the Duero River basin and eventually reaches the Atlantic Ocean.
The plant provides advanced treatment, exceeding the secondary treatment standard required by the EU Urban Waste Water Treatment Directive for agglomerations of this size.
As a Spanish wastewater facility, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations over 2,000 population equivalent, with advanced treatment in sensitive areas.
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