Overview
Nisa wastewater treatment plant serves the town of Nisa in Portalegre, Portugal. It provides secondary treatment for a population of 3,700 and has a designed capacity of 4,500 m³/day.
The Nisa wastewater treatment plant is located in the town of Nisa, within the Portalegre district of Portugal. It serves a population of approximately 3,700 residents, making it a small-scale municipal facility. The plant is situated near the Espírito Santo area, along EM 526, and plays a key role in managing local wastewater. The plant operates with secondary treatment, which is the standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent between 2,000 and 10,000. Its designed capacity is 4,500 m³/day, and the reported discharge volume is 616.90 m³/day, indicating operational headroom. The facility is not within 10 km of the coast, classifying it as an inland plant. The treated effluent is discharged into a local watercourse, which eventually drains into the Tagus River basin, one of the major river systems in Portugal and the Iberian Peninsula. The Tagus River flows westward to the Atlantic Ocean near Lisbon, supporting diverse aquatic ecosystems and providing water for agriculture and urban use downstream.
Environmental context
The Nisa plant discharges into a tributary of the Tagus River basin, which is the longest river in the Iberian Peninsula. The Tagus flows through Portugal and Spain, emptying into the Atlantic Ocean at the Tagus Estuary near Lisbon. This estuary is an ecologically sensitive area that supports diverse birdlife and fish species, including migratory species. The plant's secondary treatment helps reduce organic pollution and protect downstream water quality.
Frequently asked questions
The Nisa wastewater treatment plant is located on EM 526 in the Espírito Santo area, within the parish of Nossa Senhora da Graça e São Simão, in Nisa, Portalegre district, Portugal.
The Nisa plant serves a population of approximately 3,700 people, classifying it as a small agglomeration under EU regulations.
The plant provides secondary treatment, which typically involves biological processes to remove organic matter and suspended solids. This level of treatment is standard for small communities under the EU Urban Waste Water Treatment Directive.
The treated effluent from the Nisa plant is discharged into a local watercourse that is part of the Tagus River basin. The Tagus River flows to the Atlantic Ocean, supporting diverse ecosystems along its course.
As a Portuguese facility, the Nisa plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations with a population equivalent between 2,000 and 10,000. National regulations transposing the directive are enforced by Portuguese environmental authorities.
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