ZAIDIN Wastewater Treatment Plant, Zaidín, Aragón, Spain

ZAIDIN is a wastewater treatment plant located in Zaidín (Saidí), a municipality in the Bajo Cinca / Baix Cinca comarca of Huesca, Aragón, Spain. The plant serves a population of approximately 2,397 and operates under Spain's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC). As a small agglomeration, it is required to provide secondary treatment, which the plant delivers. The plant has a designed capacity of 2,260 m³/day and currently discharges 434.45 m³/day of treated wastewater. The treatment process is secondary, ensuring organic matter and suspended solids are reduced to meet regulatory standards. The plant's operational context aligns with EU directives that mandate appropriate treatment levels based on population size and receiving water sensitivity. The treated effluent is discharged into the local hydrological network, which ultimately drains into the Ebro River basin. The Ebro River flows into the Mediterranean Sea via the Ebro Delta, a region of significant ecological importance. The plant plays a role in protecting downstream water quality and supporting the ecological health of the Ebro basin.

The plant discharges into the Ebro River basin, which flows through northeastern Spain and empties into the Mediterranean Sea via the Ebro Delta. The delta is an ecologically sensitive area that supports diverse aquatic life and migratory birds. The plant's secondary treatment helps reduce nutrient and organic loads, contributing to the protection of downstream water quality in this important watershed.