Overview
Seia wastewater treatment plant serves the town of Seia in Guarda, Portugal. It treats wastewater for approximately 15,500 people under the EU Urban Waste Water Treatment Directive.
The Seia wastewater treatment plant is located in Santiago, Seia, in the Guarda district of Portugal. It serves a population of around 15,500, classifying it as a medium-sized agglomeration under EU regulations. The plant is situated inland, away from the coast, and its treated effluent is discharged into local watercourses that ultimately flow into the Atlantic Ocean. As a Portuguese plant, Seia operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size. The directive also requires more advanced treatment if the receiving waters are designated as sensitive areas. The plant is expected to meet these regulatory standards to protect water quality. The plant's discharge contributes to the local watershed, which drains into the Mondego River basin. The Mondego River is the longest river entirely within Portugal and supports diverse aquatic ecosystems. Proper treatment at Seia helps maintain the ecological health of this river system and downstream coastal waters.
Environmental context
The Seia plant discharges into the Mondego River basin, which flows westward through central Portugal and empties into the Atlantic Ocean near Figueira da Foz. The river supports a variety of fish species and provides habitat for migratory birds. The watershed includes agricultural and urban areas, making effective wastewater treatment essential for preventing nutrient pollution and maintaining water quality in the river and coastal zone.
Frequently asked questions
The Seia wastewater treatment plant is located in Santiago, Seia, in the Guarda district of Portugal.
The Seia plant serves approximately 15,500 people, classifying it as a medium-sized agglomeration under EU regulations.
The plant discharges treated effluent into local watercourses that are part of the Mondego River basin, which flows to the Atlantic Ocean.
As a Portuguese plant, Seia operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of its size.
Under the EU Urban Waste Water Treatment Directive, plants serving between 10,000 and 150,000 people typically require secondary treatment, with possible tertiary treatment if discharging into sensitive areas.
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