Paredes_Penafiel Wastewater Treatment Plant, Paredes, Portugal

Paredes_Penafiel is a former wastewater treatment plant located in Madalena, Paredes, within the Porto district of Portugal. The plant was designed with a capacity of 20,000 cubic meters per day, indicating it served a medium-sized urban agglomeration. It is now closed and no longer operational. As a secondary treatment facility, the plant would have met the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this scale. The directive aims to protect the environment from the adverse effects of untreated wastewater. The plant's discharge likely entered local watercourses that drain into the Douro River basin, ultimately reaching the Atlantic Ocean near Porto. The region's aquatic ecosystems benefit from proper wastewater management, and the plant's closure suggests alternative treatment arrangements are in place.

The plant is located inland, more than 10 km from the coast, in the Douro River basin. Treated effluent would have flowed into tributaries of the Douro River, which discharges into the Atlantic Ocean at Porto. The Douro estuary supports diverse aquatic life and is an important ecological corridor for migratory fish species.