Overview
Gramido wastewater treatment plant serves Gondomar, Portugal, with a population equivalent of 58,800. Located near the Douro River, it operates under EU Urban Waste Water Treatment Directive standards.
Gramido is a wastewater treatment plant located in Gondomar, Porto District, Portugal. It serves a population equivalent of 58,800, classifying it as a medium-to-large agglomeration under EU regulations. The plant is situated in the Douro River basin, near the Atlantic coast. As a Portuguese facility, Gramido operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The plant's proximity to the coast (within 50 km) may subject it to additional nutrient removal requirements if the receiving waters are designated as sensitive areas. The treated effluent from Gramido ultimately discharges into the Douro River, which flows into the Atlantic Ocean near Porto. The Douro estuary is an ecologically important area supporting diverse aquatic life and migratory fish species. The plant plays a key role in protecting water quality in this region, particularly given the urban and industrial pressures from the Porto metropolitan area.
Environmental context
Gramido discharges into the Douro River basin, which flows westward to the Atlantic Ocean near Porto. The Douro estuary is a dynamic ecosystem that supports diverse aquatic life, including migratory fish such as lamprey and shad. The plant's location within 50 km of the coast means its discharge can influence coastal water quality, particularly in the sensitive Atlantic coastal zone.
Frequently asked questions
Gramido is located in Gondomar, Porto District, Portugal, at Calçada Convenção de Gramido, in the parish of Gondomar (São Cosme), Valbom e Jovim.
Gramido serves a population equivalent of 58,800, classifying it as a medium-to-large agglomeration under EU regulations.
Gramido discharges treated effluent into the Douro River basin, which flows into the Atlantic Ocean near Porto. The plant is within 50 km of the coast, so its discharge may affect coastal water quality.
As a Portuguese plant, Gramido operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations over 15,000 PE. Given its coastal proximity, additional nutrient removal may be required if the receiving waters are designated as sensitive.
Under the EU UWWTD, plants serving over 15,000 PE must provide secondary treatment. For coastal plants like Gramido, if the discharge area is sensitive to eutrophication, tertiary treatment with nutrient removal (nitrogen and phosphorus) is typically required.
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