Equivalent Population

Raw water canal

Raw water canal running from the dam built off the Ordunte river, a tributary of Cadagua river, through the pumping stations of Ibarra and Berrón.

General Information 

  • Project: DWTP (Water Treatment Plant) Sollano. 
  • Entity: Municipality of Bilbao. 
  • Location: Zalla, Vizcaya (Basque Country). Spain. 
  • Design flow: 129,600 m3/day. 
  • Population: 300,000.

Key points


Headworks or mixing chamber of three push button type decanters, 18 aquazur open type sand filters.

Reagents used in the process:

Coagulant, basic polychlorinated aluminium sulphate, flocculant, anionic polyelectrolyte, disinfectant, chlorine gas, disinfection reinforcement, hypochlorite, additional flocculant, fluoride.

Sludge treatment: 

  • Catchment dams of filter washing and decanter purge water. 
  • Thickener. 
  • Buffer tank. 
  • Press filter.

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