Freixo de Espada a Cinta Wastewater Treatment Plant, Bragança, Portugal

The Freixo de Espada a Cinta wastewater treatment plant is located in the municipality of Freixo de Espada à Cinta, in the Bragança district of northern Portugal. It serves a population of approximately 2,900 residents, making it a small-scale municipal facility. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for all discharges from agglomerations with a population equivalent (PE) between 2,000 and 10,000, which this plant falls within. The treated effluent is discharged into the local watershed, which ultimately drains into the Douro River basin. The Douro River flows westward through Portugal and empties into the Atlantic Ocean near Porto. The plant's operation helps protect the water quality of the Douro basin and the downstream coastal environment.

The plant discharges into the Douro River basin, which flows through northern Portugal and Spain before reaching the Atlantic Ocean. The Douro River supports diverse aquatic life and is an important ecological corridor. The plant's secondary treatment reduces organic pollutants and helps maintain water quality in the river and its estuary.