Overview
ARAZURI wastewater treatment plant serves Cendea de Olza / Oltza Zendea in Navarra, Spain. It treats wastewater from a population equivalent of 713,450, operating under EU Urban Waste Water Treatment Directive standards.
ARAZURI is a major wastewater treatment plant located in Cendea de Olza / Oltza Zendea, within the Iruñerria region of Navarra, Spain. Serving a population equivalent of 713,450, it is one of the largest treatment facilities in the region, handling municipal wastewater from the Pamplona metropolitan area and surrounding communities. As a large agglomeration exceeding 150,000 population equivalent, the plant is subject to the EU Urban Waste Water Treatment Directive 91/271/EEC. This directive requires advanced treatment (tertiary) for discharges into sensitive areas, and secondary treatment as a minimum for all agglomerations. The plant's scale and location in a European Union member state ensure it meets stringent regulatory standards for effluent quality. The treated effluent is discharged into the Arga River, a tributary of the Ebro River, which flows into the Mediterranean Sea via the Ebro Delta. The Arga River supports diverse aquatic life and is an important ecological corridor in Navarra. The plant's operations help protect downstream water quality in the Ebro basin, a region of significant agricultural and ecological value.
Environmental context
The plant discharges into the Arga River, which flows into the Ebro River and ultimately reaches the Mediterranean Sea through the Ebro Delta. The Ebro basin is a vital ecological region, supporting diverse aquatic habitats and migratory bird species. The plant's advanced treatment helps maintain water quality in this sensitive watershed, reducing nutrient loads that could otherwise contribute to eutrophication in coastal waters.
Frequently asked questions
ARAZURI is located in Cendea de Olza / Oltza Zendea, in the Iruñerria region of Navarra, Spain, near the Arga River.
The treated effluent is discharged into the Arga River, a tributary of the Ebro River, which flows into the Mediterranean Sea.
ARAZURI protects the Arga River and downstream water bodies including the Ebro River and the Mediterranean Sea by treating wastewater before discharge.
As a plant serving over 150,000 population equivalent, ARAZURI is classified as a large agglomeration under the EU UWWTD, requiring at least secondary treatment and potentially tertiary treatment if discharging into sensitive areas.
Plants of this scale in Spain typically employ secondary biological treatment with nutrient removal, and often tertiary treatment to meet EU standards for sensitive areas, ensuring high effluent quality.
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