Algeciras Wastewater Treatment Plant: Serving Algeciras, Andalucía, Spain

The Algeciras wastewater treatment plant is a major municipal facility serving the city of Algeciras in the Campo de Gibraltar region of Andalucía, Spain. With a population served of approximately 174,443, it is classified as a large agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant is situated near the Port of Algeciras, one of Europe's busiest ports, and its operations are critical for protecting the coastal environment. As a large agglomeration, the plant is expected to provide at least secondary treatment, and likely tertiary treatment if discharging into a sensitive area. The designed capacity is 1.00 (likely in cubic meters per second or similar unit), indicating a substantial infrastructure. The plant operates under Spain's national water regulations, which implement the EU directive, ensuring compliance with discharge standards. The treated effluent is discharged into the Bay of Algeciras, which connects to the Alboran Sea and the broader Mediterranean Sea. This coastal area supports diverse marine life, including seagrass meadows and fish populations. The plant plays a vital role in preventing nutrient pollution and safeguarding water quality in this ecologically sensitive marine environment.

The plant discharges into the Bay of Algeciras, a coastal embayment of the Alboran Sea in the western Mediterranean. This area is ecologically significant, supporting seagrass meadows and a variety of marine species. The bay's waters are influenced by the Atlantic inflow through the Strait of Gibraltar, creating a unique mixing zone. Effective treatment is essential to prevent eutrophication and protect the region's biodiversity, which includes important fisheries and migratory routes.