Overview
S Miguel wastewater treatment plant serves the city of Guarda, Portugal, with a population equivalent of 28,000. The plant operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scal
S Miguel is a wastewater treatment plant located in Guarda, Portugal, serving a population equivalent of 28,000. The plant is situated inland, approximately 50 km from the coast, and discharges into local watercourses that ultimately drain into the Atlantic Ocean via the Mondego River basin. As a plant serving an agglomeration of this size, it falls under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for discharges into freshwater and estuaries. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas, such as those prone to eutrophication. The treated effluent from S Miguel likely enters the Mondego River system, which flows westward through central Portugal before reaching the Atlantic near Figueira da Foz. The Mondego basin supports diverse aquatic life and is an important resource for agriculture and drinking water. Proper treatment at S Miguel helps protect downstream water quality and ecological health.
Environmental context
The plant discharges into the Mondego River basin, which flows into the Atlantic Ocean near Figueira da Foz. The Mondego is one of Portugal's major rivers, supporting diverse aquatic ecosystems and providing water for irrigation and human consumption. Downstream areas include estuarine habitats that are important for migratory birds and fish species. Effective wastewater treatment is crucial to prevent nutrient loading and protect these sensitive environments.
Frequently asked questions
S Miguel is located in Guarda, Portugal, at coordinates 40.543 N, -7.236 W. Guarda is a city in central Portugal, near the Serra da Estrela mountain range.
The plant serves a population equivalent of 28,000 people, which classifies it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive.
The treated effluent from S Miguel is discharged into local watercourses that are part of the Mondego River basin, eventually reaching the Atlantic Ocean. The plant is inland and not within 10 km of the coast.
As a Portuguese plant serving over 10,000 people, S Miguel operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment. Portugal has also designated sensitive areas where tertiary treatment may be needed.
For agglomerations of this size, secondary treatment (biological treatment with settlement) is standard under EU law. In sensitive areas, additional nutrient removal may be required.
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