Redondo Wastewater Treatment Plant, Redondo, Évora, Portugal

The Redondo wastewater treatment plant is located in the town of Redondo, within the Évora district of Portugal. The facility serves a population of approximately 6,000 residents, classifying it as a small agglomeration under Portuguese and EU regulations. As a plant serving fewer than 10,000 people, it falls under the EU Urban Waste Water Treatment Directive (91/271/EEC) requirements for appropriate treatment. Portuguese plants of this scale typically employ secondary biological treatment to meet national water quality standards. The plant discharges into local watercourses that ultimately drain into the Guadiana River basin, which flows south to the Gulf of Cádiz. The region's Mediterranean climate with seasonal rainfall influences the plant's operational considerations, particularly during dry summer months when receiving water flows are reduced.

The Redondo plant is situated inland in the Alentejo region, approximately 50 km from the coast. Treated effluent likely enters small tributaries that feed into the Guadiana River, which flows into the Gulf of Cádiz. The Guadiana basin supports diverse aquatic life and is an important migratory corridor for fish species. The plant's discharge contributes to maintaining water quality in this semi-arid region where water resources are seasonally stressed.