SISANTE Wastewater Treatment Plant, Sisante, Castilla-La Mancha, Spain

SISANTE is a municipal wastewater treatment plant located in Sisante, a town in the Castilla-La Mancha region of central Spain. The plant serves a population of 3,121, classifying it as a small agglomeration under Spanish and EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, ensuring compliance with EU effluent quality standards. The treated effluent is discharged into the local hydrological network, which ultimately drains into the Júcar River basin and then into the Mediterranean Sea. The plant plays a key role in protecting the Júcar River and its downstream ecosystems from nutrient pollution and organic load, supporting aquatic biodiversity and water quality in the region.

The plant discharges into the Júcar River basin, which flows eastward through Castilla-La Mancha and Valencia before reaching the Mediterranean Sea. The Júcar River supports diverse aquatic life and is an important water resource for agriculture and urban supply. The plant's secondary treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in downstream reservoirs and coastal waters.