Bonares Wastewater Treatment Plant: Serving Bonares, Andalucía, Spain

The Bonares wastewater treatment plant is located in the municipality of Bonares, in the province of Huelva, Andalucía, Spain. The facility serves a population of approximately 8,500 residents, classifying it as a small-to-medium agglomeration under EU classification. The plant is situated near the Río Tinto basin, which flows into the Atlantic Ocean via the Gulf of Cádiz. As a Spanish wastewater facility, Bonares operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, transposed into Spanish law through Royal Decree-Law 11/1995 and subsequent regulations. For agglomerations with a population equivalent between 2,000 and 10,000, the directive requires secondary treatment (biological treatment) as a minimum standard. The treated effluent from Bonares ultimately discharges into the Río Tinto watershed, a river known for its unique acidic waters and reddish color due to historical mining activity. The river flows southward through the Doñana region, an ecologically sensitive area that supports diverse aquatic life and important migratory bird populations. The plant's operation is critical for protecting the downstream environment, including the Doñana wetlands and the Gulf of Cádiz coastal ecosystem.

Bonares is located in the Río Tinto basin, which drains into the Atlantic Ocean through the Gulf of Cádiz. The Río Tinto is a unique water body with naturally high acidity and metal content due to the Iberian Pyrite Belt geology. Downstream, the river passes through the Doñana region, an ecologically sensitive area that supports diverse aquatic life and serves as an important migratory corridor for birds. The treatment plant helps reduce organic and nutrient loads entering this fragile watershed.