Extension and upgrading of San Claudio and Villaperez WWTPS in Oviedo (Asturias, Spain)


The San Claudio and Villaperez Wastewater Treatment Plants form part of the Nora River Basin Sanitation System in the Central Area of Asturias and receive wastewater from los Concejos de Oviedo, Siero, Noreña and Llanera.

In recent years, it has been observed that the two plants have received flows and pollutant loads higher than those for which they were designed. This has made it necessary to expand the facilities in order to attain the treatment standards needed to maintain quality levels in the river beds and also to enable the plants to deal with current inflows and the potential development of nearby urban and industrial areas.

ACUAES’s approach to this initiative was not limited to water treatment. It also encompassed issues such as the reduction of waste generated by the facilities, sludge treatment at the WWTPs themselves, as well as noise and odour control. Measures implemented for this purpose included housing all odour-producing elements within buildings in order to avoid odour emissions, and the installation of individual odour control and extraction systems. At Villapérez, odours undergo chemical treatment, while the San Claudio plant implements biological odour control processes.

This initiative will enable increased maximum inflows to the plants and the implementation of enhanced new treatment processes. These leading edge, comprehensive processes will also ensure the treatment of discharges at times of heavy rainfall. The comprehensive odoucontrol systems installed at the plants represent a significant improvement on the systems previously in place prior to the extension work.

This project was promoted by the Ministry of Agriculture, Food and Environmental Affairs, through state-owned enterprise Aguas de las Cuencas de España (Acuaes). It was financed with proprietary funds, the European Cohesion Fund, and funds provided by the Principality of Asturias.

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