Since 2005, Veolia Water Technologies has developed a rapid DAF process in its portfolio, named Spidflow®. This process responds to treatment needs in case of surface water containing low density particules, algae, floating matters (greases, oils...).

The flotation is made possible with a white water production (air and water mix under 5-6 bars) capable to generate fine air bubbles which are released in the system to occur the low density particules flotation.

The Spidflow® hydraulic design has been particularly optimized with the help of CFD (Computerized Fluids Dynamics) calculation simulations. Some hydraulic management devices, associated downstream to a coagulation/flocculation stage, allow Spidflow™ to reach high clarification rates in the range of 30 to 50 m/h.


Usually, Spidflow® doesn't need polymer for the flocculation step, only in case of cold water; which is an advantage to produce very nice SDI (Silt Density Index) water quality in case of membranes uses downstream.

It's also possible to use PAC (Powdered Activated Carbon) continuously or during shorts events, in the Spidflow®. This is helpful in case of algal toxins release in the water by blue algae type (Cyanobacteria). The PAC is then a security step, capable of removing by adsorption the released toxins.

Application range

Spidflow® is applied for :

  • drinking water treatment,
  • sea water treatment (upstream to RO treatment systems), really efficient in case of red tides events
  • process water production (power plants...)