EDAR de Marazul Wastewater Treatment Plant, Adeje, Tenerife

EDAR de Marazul is a municipal wastewater treatment plant located in the Marazul area of Adeje, on the southwestern coast of Tenerife in the Canary Islands, Spain. The plant serves a population of approximately 2,042 residents and is part of the region's infrastructure for managing domestic wastewater in a popular tourist destination. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological oxidation and settling to reduce organic matter and suspended solids. The plant has a designed capacity of 3,708 m³/day and currently treats an average of 370.11 m³/day, indicating a utilization rate of about 10%. The treated effluent is discharged into the coastal waters of the Atlantic Ocean, as the plant is situated within 10 km of the coast. This discharge is subject to Spanish and EU regulations to protect marine water quality, particularly given the ecological sensitivity of the Canary Islands' coastal ecosystems, which support diverse marine life and are important for tourism and fisheries.

The plant discharges into the Atlantic Ocean near the coast of Adeje, Tenerife. The surrounding marine environment includes seagrass meadows and rocky reefs that support a variety of fish and invertebrate species. As part of the Macaronesian biogeographic region, these waters are ecologically sensitive and require careful management of nutrient inputs to prevent eutrophication and protect biodiversity.