SADABA Wastewater Treatment Plant, Sádaba, Aragón, Spain

The SADABA wastewater treatment plant is located in Sádaba, a municipality in the Cinco Villas region of Zaragoza, Aragón, Spain. It serves a population of 1,128 and operates under Spain's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. As a secondary treatment facility, the plant uses biological processes to reduce organic matter and suspended solids. Its designed capacity of 3,000 m³/day provides headroom for future growth. The plant discharges an average of 204.45 m³/day of treated wastewater. The treated effluent is discharged into a local watercourse that ultimately drains into the Ebro River basin, one of Spain's major river systems. The Ebro flows into the Mediterranean Sea via the Ebro Delta, an ecologically sensitive area that supports diverse aquatic life and important migratory bird populations.

The plant's discharge enters a tributary of the Ebro River, which flows through northeastern Spain to the Mediterranean Sea. The Ebro Delta is a critical habitat for waterbirds and supports extensive rice farming. Secondary treatment helps protect downstream water quality and the delta's ecological balance.