Ferreira do Alentejo Wastewater Treatment Plant, Beja District, Portugal

The Ferreira do Alentejo wastewater treatment plant is located in the Beja district of southern Portugal, serving the town of Ferreira do Alentejo and its surrounding area. With a population equivalent of 3,800, it is classified as a small agglomeration under Portuguese and EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. Its designed capacity of 4,000 m³/day and current discharge volume of 633.58 m³/day indicate operational headroom for future growth. Treated effluent is discharged into local watercourses that drain into the Sado River basin, eventually reaching the Atlantic Ocean near Setúbal. The Sado estuary supports diverse aquatic life and is an important ecological area for migratory birds and fish species.

The plant discharges into the Sado River basin, which flows into the Sado estuary and then the Atlantic Ocean. The Sado estuary is a productive ecosystem supporting diverse aquatic life, including fish nurseries and migratory bird populations. The region's Mediterranean climate with dry summers means consistent treated effluent flow helps maintain base flows in receiving streams.