ALANIS Wastewater Treatment Plant, Alanís, Andalucía, Spain

The ALANIS wastewater treatment plant is located in Alanís, a municipality in the province of Seville, within the autonomous community of Andalucía, Spain. This facility serves a population of approximately 3,383 residents, reflecting its role in managing domestic wastewater for a small inland community. The plant is situated near the A-432 road, in a rural setting typical of the Sierra Morena region. 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 designed capacity of 3,383 cubic meters per day aligns with the population served, indicating adequate infrastructure for current demand. The plant operates under Spain's national water regulations, which transpose EU directives and are enforced by regional authorities in Andalucía. The treated effluent from ALANIS is discharged into local watercourses that eventually drain into the Guadalquivir River basin, one of Spain's major river systems. The Guadalquivir flows southwest through Andalucía and empties into the Atlantic Ocean at the Gulf of Cádiz. This downstream connection underscores the plant's role in protecting the ecological health of the Guadalquivir watershed, which supports diverse aquatic life and agricultural activities.

The ALANIS plant discharges into the Guadalquivir River basin, which drains a large part of southern Spain and ultimately reaches the Atlantic Ocean. The watershed supports a variety of ecosystems, including Mediterranean forests and wetlands that are important for migratory birds. Advanced treatment helps minimize nutrient loading, reducing the risk of eutrophication in downstream water bodies.