Montemor o Velho Wastewater Treatment Plant, Montemor-o-Velho, Portugal

The Montemor o Velho wastewater treatment plant is located in Montemor-o-Velho, Coimbra District, Portugal. It serves a population of approximately 2,400 residents, classifying it as a small agglomeration under Portuguese and EU regulations. The plant is situated inland, more than 10 km from the coast, and its treated effluent flows into the Mondego River basin. As a secondary treatment facility, Montemor o Velho meets the minimum requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The plant has a designed capacity of 3,000 m³/day and currently treats an average daily volume of 400 m³, indicating ample reserve capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant discharges into the Mondego River, which flows westward through central Portugal and enters the Atlantic Ocean near Figueira da Foz. This river supports diverse aquatic life and is an important ecological corridor. The plant's operation helps protect water quality in the Mondego basin and downstream coastal waters.

The Montemor o Velho plant discharges into the Mondego River, which flows through the Coimbra region and empties into the Atlantic Ocean at Figueira da Foz. The Mondego basin supports a variety of freshwater species and is used for agriculture and recreation. Downstream, the estuary provides critical habitat for migratory birds and fish. The plant's secondary treatment reduces organic pollution, helping maintain the ecological health of the river and coastal zone.