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Located in Seville Seville, Spain See on Google Maps
ACCIONA manages the contract to operate, maintain and conserve the wastewater treatment plant of Mairena and El Viso del Alcor. This WWTP - built by the ACCIONA-SANDO joint venture in 2004 and operated by ACCIONA at various stages - has a design flow of 9,220 m3/day and is designed to serve a population equivalent of 41,000 inhabitants.

Among the new features included in the contract is the implementation of a photovoltaic plant that will cover around 30% of the energy consumption of the facilities with renewable energy, as well as the installation of a new centrifugal decanter and an overflow control system equipped with a screening system. In addition, among other efficiency improvements, ACCIONA has included in its bid the implementation of an intelligent system, developed in-house, to control the aeration of the biological process called Biocontrol-Carr®. Its use will result in additional savings in the supply of oxygen to the biological treatment.

General Information

  • Project: WWTP Mairena and Viso.
  • Entity: EMASESA.
  • Location: Mairena and Viso del Alcor, Seville. Spain.
  • Design flow: 9,220 m3/day.
  • Population: 41,000 inhabitants

Key points - treatment

Pre-treatment:

Large particle screens, sifting, desander, sand classifier, deoiler and influent flow metre

Secondary treatment:

Biological treatment of active sludge with nitrification-denitrification and stabilisation of sludge. O2 input / Mud recirculation / Sedimentation

Mud treatment:

Thickener

Miscellaneous:

Deodorising

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