SESENA Wastewater Treatment Plant, Seseña, Castilla-La Mancha, Spain

The SESENA wastewater treatment plant is located in Seseña, a municipality in the province of Toledo, Castilla-La Mancha, Spain. The plant serves a population of approximately 12,097 people, providing secondary treatment to municipal wastewater. As a facility in an inland region, it plays a key role in protecting local water resources. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations with a population equivalent between 10,000 and 150,000 are required to have secondary treatment. SESENA meets this standard with its secondary treatment process. The treated effluent from SESENA ultimately drains into the Tagus River basin, which flows westward through Spain and Portugal to the Atlantic Ocean. The Tagus River supports diverse aquatic life and is an important water source for agriculture and urban areas. Proper treatment at SESENA helps reduce nutrient and pollutant loads, contributing to the ecological health of the downstream environment.

SESENA's treated wastewater discharges into the Tagus River basin, which flows through central 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. Effective secondary treatment at SESENA helps control nutrient inputs, protecting downstream water quality and aquatic ecosystems.