Seawater desalination for supplying the city and surrounding area

Starting the provision of services in 1995 this installation consisted of a single reverse osmosis module capable of producing 4,000 m3 / d of desalinated water, suitable for distribution to the municipal deposits of the supply networks of Arucas and Moya.

Due to the economic and social expansion, and in order to adapt to the growing water needs, in 1998 the Ministry of the Environment awarded ACCIONA the expansion of the Arucas-Moya desalination plant, consisting of the construction and commissioning of a new reverse osmosis frame with a capacity of 5,000 m3/d and the improvement of the old installation, in order to obtain a desalinated water production center of 10,000 m³/d.

In 2006, ACCIONA was awarded a new expansion of the plant, consisting of the increase of IDAM production to 15,000 m³ / day, without the need to expand the civil works of the facility and incorporating the latest technology in energy recovery . In addition, this contract has a 15-year exploitation concession period.

The achievement of this work now allows a desalination plant in the forefront of the technique, which has a production capacity of 15,000 m³/d capable of meeting the needs and water demands of the area.

General information

  • Entity: Insular Council of Aguas de Gran Canaria
  • Location: Arucas, Gran Canaria. Spain
  • Flow: 15,000 m3 / day
  • Population: 100,000 inhabitants

Key aspects


  • Production: 2 x 7,500 m³ / day
  • Salinity: = 700 μS / cm
  • Specific consumption: 3.84 kWh / m³


  • Uptake: 6 wells + pitcher
  • Filtration: 1st Stage: 4 sand filters, 2nd Stage: 4 cartridge filters
  • Chemical Dosage: Sulfuric acid, sodium hypochlorite and sodium bisulfite
  • Turbo pumps: 2 (TBB-ERI) + 1 (TBB-Pelton Turbine)
  • Racks: 2
  • Membranes: 1,162 pcs (high rejection and low energy)
  • Remineralization: Carbon dioxide + calcium hydroxide
  • The capture of seawater is carried out through 6 coastal wells and
  • Throughout the process, the dosage of sulfuric acid, sodium hypochlorite and sodium bisulfite is necessary
  • The plant has a filtration system composed of 4 sand filters and 4 cartridge filters
  • It has 2 groups of high pressure plus 1 reserve
  • A booster pump is installed with a set consisting of 10 pressure exchange equipment, ERI PX-220, in each line, for energy recovery. In the high pressure reserve group, the Pelton turbine system is maintained
  • The production of the plant is achieved through 2 racks of reverse osmosis with a capacity of 7,500 m3 / d, respectively
  • It has a remineralization system based on the injection of carbon dioxide and lime hydroxide, which makes it possible to adapt the Langelier index to the requirements prescribed by the R.D. 140/2003

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