GASTOR EL Wastewater Treatment Plant, El Gastor, Andalucía, Spain

GASTOR EL is a municipal wastewater treatment plant located in El Gastor, a town in the Sierra de Cádiz region of Andalucía, Spain. The plant serves a population of approximately 3,000 people, reflecting its role as a small-scale facility for a rural community. It operates under Spain's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which sets standards for wastewater treatment based on population equivalents and receiving water sensitivity. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 3,000 m³/day and a discharge volume of about 544 m³/day, the facility operates well within its capacity, indicating effective management for the local demand. Secondary treatment is appropriate for this scale and location, meeting EU requirements for agglomerations under 10,000 population equivalents in non-sensitive areas. The treated effluent is discharged into local watercourses that drain into the Guadalete River basin, eventually reaching the Atlantic Ocean via the Bay of Cádiz. The plant plays a crucial role in protecting the region's water quality, supporting downstream ecosystems and agricultural water use in the surrounding Sierra de Cádiz area.

The plant discharges into the Guadalete River basin, which flows through the Sierra de Cádiz and into the Bay of Cádiz, a coastal wetland of ecological importance. The downstream environment supports diverse aquatic life and migratory birds, making effective wastewater treatment essential to prevent nutrient enrichment and protect water quality in this sensitive Mediterranean ecosystem.