ROSAL DE LA FRONTERA Wastewater Treatment Plant, Andalucía, Spain

ROSAL DE LA FRONTERA is a wastewater treatment plant located in Rosal de la Frontera, a municipality in the Sierra de Huelva region of Andalucía, Spain. The plant serves a population of 1,513 and is part of the local municipal wastewater infrastructure, ensuring that domestic sewage is treated before being returned to the environment. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 2,648 m³/day and an actual discharge volume of 274.23 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variations. The treated effluent is discharged into a local watercourse, likely a tributary of the Guadiana River basin, which flows into the Gulf of Cádiz (Atlantic Ocean). The advanced treatment helps protect the sensitive aquatic ecosystems of the region, including the nearby Sierra de Aracena and Picos de Aroche Natural Park, an area known for its biodiversity and water quality.

The plant discharges into a local stream that is part of the Guadiana River basin, which flows into the Gulf of Cádiz in the Atlantic Ocean. The region is ecologically sensitive, supporting diverse aquatic life and serving as an important corridor for migratory birds. Advanced treatment ensures minimal nutrient and pollutant loading, helping to preserve water quality in the downstream environment.