Overview
Viana do Alentejo Zona Oeste is a secondary wastewater treatment plant serving 1,400 people in Viana do Alentejo, Portugal. It discharges 233.42 m³/day of treated effluent into the local watershed.
Viana do Alentejo Zona Oeste is a wastewater treatment facility located in the Évora district of Portugal, serving the community of Viana do Alentejo. The plant provides secondary treatment for a population of approximately 1,400 residents, with a designed capacity of 1,400 m³/day and an average daily discharge of 233.42 m³. As a secondary treatment plant, it meets the standard requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for populations between 2,000 and 10,000 in inland areas, and Portugal implements this through national regulations. The plant's capacity utilization is low, indicating it operates well within its design limits. The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the Sado River basin. The region is characterized by Mediterranean climate and agricultural land use. The plant plays a key role in protecting local water quality and supporting the ecological health of downstream water bodies.
Environmental context
The plant discharges into the Sado River basin, which flows westward to the Atlantic Ocean near Setúbal. The Sado estuary is an ecologically sensitive area supporting diverse aquatic life, including migratory fish and bird species. The plant's secondary treatment helps reduce nutrient and organic loads, protecting the downstream environment from eutrophication and maintaining water quality for agricultural and ecological uses.
Frequently asked questions
The plant is located at Horta Vale dos Gatos, EN 257, Herdade da Chaminé, in Viana do Alentejo, Évora district, Portugal.
The plant serves approximately 1,400 residents of Viana do Alentejo.
The treated effluent is discharged into the local watershed, which flows into the Sado River basin and ultimately reaches the Atlantic Ocean.
The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive for agglomerations of this size in inland areas.
As a Portuguese plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for populations between 2,000 and 10,000. Portugal enforces this through national legislation.
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