Population equivalent

Improvement, service and management and maintenance

In 2002, ACCIONA carried out Improvement, Service and Management works at the plant, which is located in Cagliari is Arenas and has the capacity to treat 260,000 cubic metres of water a day, making it the largest on the island of Sardinia. In addition, during this three-year contract, the sludge line was upgraded. The biological water treatment was transformed through the installation of 16,000 membrane diffusers and four turbocompressors, providing service to more than 1.1 million inhabitants.

General Information

  • Entity: Comune di Cagliari
  • Localización: Cagliari, Sardinia, Italy
  • Population: 1,150,000 hab/eq
  • Capacity: 260,000 m3/day

Key points

Water line

  • Raw water elevation
  • Screening
  • Sieving
  • Grit and grease removal.
  • Primary settling
  • Half load, piston flow active sludge reactor biological treatment.
  • Secondary settling
  • Effluent disinfection

Sludge line

  • Primary sludge purge
  • Biological sludge purge
  • Thickening
  • Anaerobic digestion
  • Band filters and centrifugal pumps dehydration
  • Biological Gas line
  • Biological gas storage in gasholder
  • Electrical power generation
  • Sludge heating
  • Surplus biological gas burning
  • Auxiliary services
  • Compressed air production and distribution
  • Service water production by sand filtration and distribution.
  • Drinking water distribution
  • Installations Up-Dating
  • Biological nitrogen removal system installation using Nitrification Denitrification in the biological reactors.
  • Installation of a system to adapt flows from septic tanks and rubbish Gump lixiviates previous to their incorporation to the ordinary plat treatment

Discover other projects of ACCIONA

All of our projects