Torre del Bierzo Wastewater Treatment Plant - Castilla y León, Spain

Torre del Bierzo wastewater treatment plant is located in the municipality of Torre del Bierzo, in the El Bierzo region of León, Castilla y León, Spain. The plant serves a population of approximately 2,000 residents, classifying it as a small agglomeration under EU regulations. Its advanced treatment level ensures high-quality effluent suitable for discharge into local water bodies. The plant has a designed capacity of 2,000 m³/day and currently treats 362.49 m³/day of wastewater. As a Spanish facility, it operates under the national transposition of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size, with advanced treatment in sensitive areas. The plant's advanced treatment exceeds the minimum requirements, providing additional nutrient removal and disinfection. The treated effluent is discharged into the local watershed, which ultimately drains into the Sil River, a tributary of the Miño River. The Miño flows into the Atlantic Ocean at the border between Spain and Portugal. The plant plays a key role in protecting the water quality of the Sil and Miño rivers, supporting aquatic life and downstream ecosystems.

The plant discharges into the Sil River basin, which flows into the Miño River and then to the Atlantic Ocean. The Miño-Sil system supports diverse aquatic life, including migratory fish species such as Atlantic salmon and sea lamprey. The advanced treatment helps maintain water quality in this ecologically sensitive river network, which is important for both biodiversity and human uses downstream.