VILLAPEREZ Wastewater Treatment Plant, Siero, Asturias, Spain

VILLAPEREZ is a wastewater treatment plant located in Siero, Asturias, Spain. Serving a population equivalent of 323,200, it is classified as a large agglomeration under EU regulations. The plant is situated in the northern coastal region of Spain, near the Bay of Biscay. As a large agglomeration, the plant is subject to the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment as a minimum and tertiary treatment for discharges into sensitive areas. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating a substantial infrastructure to handle the wastewater from the urban and potentially industrial areas of Siero and surrounding communities. The treated effluent is discharged into the local watershed, which ultimately drains into the Bay of Biscay (Atlantic Ocean). The region's rivers, such as the Nalon River, support diverse aquatic life and are important for local ecosystems. The plant plays a critical role in protecting the coastal and marine environment from nutrient pollution and pathogens.

The plant discharges into the Nalon River basin, which flows northward into the Bay of Biscay. This coastal area supports diverse marine life and is ecologically sensitive due to its role as a nursery for fish and migratory bird habitats. The region's estuaries are important for water quality and biodiversity, making advanced treatment essential to prevent eutrophication and protect downstream ecosystems.