Villalba del Alcor Wastewater Treatment Plant - Andalucía, Spain

Villalba del Alcor is a wastewater treatment plant located in the municipality of Villalba del Alcor, within the El Condado region of Huelva province, Andalucía, Spain. The plant serves a population of approximately 3,684 residents, classifying it as a small agglomeration under Spanish and EU regulations. It is situated inland, more than 10 km from the coast, and its treated effluent contributes to the local hydrological network. 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. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant's designed capacity is 3,684 m³/day, and it currently discharges 667.72 m³/day, indicating significant spare capacity. As a Spanish facility, it operates under national transposition of EU directives, with permits issued by the regional water authority (Confederación Hidrográfica del Guadalquivir or similar). The treated wastewater is discharged into local streams that eventually drain into the Atlantic Ocean via the Guadalquivir River basin or smaller coastal rivers. The surrounding area is characterized by Mediterranean climate and agricultural landscapes. The advanced treatment helps protect downstream ecosystems, including the Doñana wetlands and the Gulf of Cádiz, which are ecologically sensitive areas supporting diverse aquatic life and migratory birds.

The plant discharges into local watercourses that flow towards the Atlantic Ocean, likely contributing to the Guadalquivir River basin or adjacent coastal systems. The downstream environment includes ecologically sensitive areas such as the Doñana wetlands, a critical habitat for migratory birds and endangered species. Advanced treatment ensures nutrient removal, reducing the risk of eutrophication in these downstream waters.