ALBATERA SAN ISIDRO Wastewater Treatment Plant, San Isidro, Spain

ALBATERA SAN ISIDRO is a wastewater treatment plant located in San Isidro, within the Comunitat Valenciana region of Spain. The facility serves a population equivalent of 20,070, classifying it as a medium-sized agglomeration under EU classification. Its location near the Segura River basin places it within a semi-arid Mediterranean climate zone, where water reuse and treatment efficiency are critical for local water resources. As a Spanish plant serving over 10,000 people, ALBATERA SAN ISIDRO operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment as a minimum for agglomerations of this size. Spanish regulations, enforced by regional water authorities, mandate compliance with discharge standards to protect receiving water bodies. The plant discharges treated wastewater into the Segura River basin, which flows into the Mediterranean Sea via the Vega Baja del Segura region. This area supports irrigated agriculture and wetlands of ecological importance, including the Salinas de Santa Pola and El Hondo natural areas. Proper treatment is essential to prevent nutrient loading and maintain water quality for downstream ecosystems and agricultural reuse.

The plant's treated effluent enters the Segura River basin, a water-stressed catchment in southeastern Spain. The river flows through the Vega Baja region before reaching the Mediterranean Sea near Guardamar del Segura. Downstream ecosystems include coastal lagoons and salt marshes that support diverse birdlife and aquatic species. Effective nutrient removal is critical to prevent eutrophication in these sensitive coastal environments, especially given the region's intensive agricultural water demand.