Tondela Wastewater Treatment Plant: Secondary Treatment for 5,000 People in Portugal

The Tondela wastewater treatment plant is located in Tondela, Viseu District, Portugal, serving a population of 5,000. It is situated in the Dão River basin, an inland region known for its agricultural and wine-producing areas. The plant provides secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive for agglomerations of this size in non-sensitive areas. The plant has a designed capacity of 5,000 m³/day and currently discharges 833.65 m³/day of treated wastewater. As a secondary treatment facility, it removes organic matter and suspended solids, meeting EU standards for biological oxygen demand and chemical oxygen demand. The plant is operated as part of Portugal's municipal wastewater infrastructure, overseen by the national water authority. The treated effluent is discharged into the local watershed, which drains into the Dão River, a tributary of the Mondego River. The Mondego River flows westward to the Atlantic Ocean near Figueira da Foz. The plant plays a key role in protecting the Dão River's water quality, supporting aquatic life and downstream ecosystems in the Mondego basin.

The Tondela plant discharges into the Dão River basin, which flows into the Mondego River, one of Portugal's major rivers. The Mondego River supports diverse aquatic habitats and is important for irrigation and recreation. The plant's secondary treatment helps reduce nutrient and organic pollution, safeguarding the ecological health of the Dão and Mondego rivers before they reach the Atlantic Ocean.