Aldea del Fresno Wastewater Treatment Plant - Comunidad de Madrid, Spain

Aldea del Fresno wastewater treatment plant is located in the municipality of Aldea del Fresno, within the Comunidad de Madrid, Spain. The plant serves a population of 3,092 and is designed to handle up to 6,000 m³/day of wastewater, with a current discharge volume of 443.24 m³/day. The plant provides 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 remove organic matter and suspended solids, ensuring compliance with EU effluent standards before discharge. The treated effluent is discharged into the local water system, which ultimately drains into the Tagus River basin. The Tagus River is the longest river in the Iberian Peninsula and supports diverse aquatic ecosystems. The plant's operations help protect downstream water quality in this important river system.

The plant discharges into the Tagus River basin, which flows westward through Spain and Portugal before reaching the Atlantic Ocean near Lisbon. The Tagus River supports a variety of fish species and provides habitat for migratory birds. The plant's secondary treatment helps reduce nutrient and organic pollution, contributing to the ecological health of the river and its estuary.