Valenca Wastewater Treatment Plant: Serving Valença, Portugal

The Valenca wastewater treatment plant is located in the municipality of Valença, in the Viana do Castelo district of northern Portugal. It serves a population of approximately 9,100 people, classifying it as a medium-sized agglomeration under EU standards. The plant is situated near the border with Spain, close to the Minho River. As a Portuguese facility, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The designed capacity is reported as 1.00 (likely in thousands of cubic meters per day), indicating a facility scaled to handle the local population's wastewater. The plant is expected to meet EU standards for effluent quality. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Minho River. The Minho River forms the border between Portugal and Spain and flows into the Atlantic Ocean at the Minho estuary. This estuary is an ecologically important area, supporting diverse aquatic life and serving as a migratory corridor for fish species. The plant's performance is critical for protecting water quality in this transboundary river system.

The Valenca plant discharges into the Minho River basin, which flows westward to the Atlantic Ocean via the Minho estuary. The estuary is a productive ecosystem that supports diverse fish, bird, and plant communities. The plant's treated effluent must meet EU standards to protect this sensitive downstream environment, which is important for both local biodiversity and regional water quality.