Alagoa Wastewater Treatment Plant, Arganil, Portugal

Alagoa is a secondary wastewater treatment plant located in the village of Alagoa, part of the municipality of Arganil in the Coimbra district of Portugal. The plant serves a population of approximately 3,900 people, making it a small-scale facility within the region's wastewater infrastructure. The plant operates with secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant has a designed capacity of 7,693 cubic meters per day and currently discharges a volume of 650.25 cubic meters per day. The treated effluent from Alagoa is released into the local environment, contributing to the protection of water quality in the surrounding watershed. The area is part of the Mondego River basin, which drains into the Atlantic Ocean near Figueira da Foz. Proper treatment helps safeguard aquatic ecosystems and supports downstream water uses.

Alagoa's treated wastewater discharges into the local watershed, which is part of the Mondego River basin. The Mondego River flows westward through central Portugal and empties into the Atlantic Ocean near Figueira da Foz. This coastal zone supports diverse marine life and is an important area for fisheries and tourism. The plant's secondary treatment helps reduce nutrient and organic pollution, protecting downstream water quality and ecological health.