Overview
Agua Longa wastewater treatment plant serves 12,200 people in Santo Tirso, Portugal. It operates under the EU Urban Waste Water Treatment Directive, with a designed capacity of 1.00 volume units.
Agua Longa is a wastewater treatment plant located in the parish of Água Longa, in the municipality of Santo Tirso, Porto district, Portugal. It serves a population of approximately 12,200 people, placing it in the medium agglomeration category under EU classification. The plant is situated in the northern region of Portugal, an area characterized by a temperate maritime climate and significant industrial activity. As a facility serving a medium-sized community, Agua Longa is expected to comply with the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for discharges into freshwater and estuaries. The regulatory framework ensures that treated effluent meets quality standards to protect receiving waters. The plant discharges into the local watershed, which ultimately drains into the Atlantic Ocean via the Douro River basin. The Douro River is one of the major rivers in the Iberian Peninsula, supporting diverse aquatic ecosystems and providing water for agriculture and urban use. The treatment plant plays a key role in maintaining water quality in this ecologically sensitive region.
Environmental context
Agua Longa is located in the Douro River basin, which flows westward through northern Portugal and into the Atlantic Ocean near Porto. The Douro River supports a rich diversity of fish species, including migratory fish like salmon and lamprey, and its estuary is an important habitat for birds. The plant's discharge contributes to the overall water quality of this basin, which is subject to EU water quality standards to protect downstream ecosystems and human uses.
Frequently asked questions
Agua Longa is located in the parish of Água Longa, in the municipality of Santo Tirso, Porto district, Portugal. The address is Rua da Cruz, Cruz, Água Longa, Santo Tirso, 4825-075.
The plant serves a population of approximately 12,200 people, classifying it as a medium-sized agglomeration under EU standards.
The plant discharges treated effluent into the local watershed, which is part of the Douro River basin. The Douro River flows into the Atlantic Ocean near Porto.
As a Portuguese wastewater treatment plant, Agua Longa operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for discharges into freshwater and estuaries for agglomerations of this size.
In Portugal, plants serving populations between 10,000 and 150,000 are typically required to provide secondary treatment, which involves biological processes to reduce organic matter and suspended solids, in line with EU directives.
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