LUNA Wastewater Treatment Plant, Luna, Aragón, Spain

LUNA is a wastewater treatment plant located in Luna, a municipality in the Cinco Villas comarca of Zaragoza province, Aragón, Spain. The plant serves a population of approximately 2,728 residents, making it a small-scale facility within the region's wastewater infrastructure. The plant operates with secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent between 2,000 and 10,000. The designed capacity of 2,500 m³/day aligns with the population served, and the reported discharge volume of 494.44 m³/day indicates operational activity. The treated effluent is discharged into the local watershed, which ultimately drains into the Ebro River basin, one of the largest river systems in Spain. The Ebro River flows into the Mediterranean Sea, supporting diverse aquatic ecosystems and agricultural water use downstream. The plant's secondary treatment helps protect these water bodies from organic pollution.

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, including important fish and bird species. Secondary treatment reduces organic load and helps maintain water quality in the river system, which is used for irrigation and drinking water supply downstream.