In a flotation process it is fundamental that the amount of the dissolved air into the water to be treated is in a correct ratio with the concentration of the suspended solids to be removed. The efficiency of a flotation process is depending on the yield of the saturator that has to guarantee a continuous and homogeneous dissolution of the air into the water, to generate the microbubbles responsible of the flotation process.
The microbubbles, the lifting device for the solids to be floated up, are produced when the pressure is reduced from the saturator pressure at the atmospheric value, by laminating the pressurized water through a suitable depressurization valve. Each flotator is working in combination with a saturator.
The PRV is a high efficiency vertical saturator designed and tested in accordance with the safety standards and directives of the installation Country. The inlet of the water to be pressurized is from the top of the tank, together with a controlled amount of pressurized air. The saturator is designed in order to generate an internal turbulence that is guaranteeing the optimal mixing between water and air, thus allowing the air to be dissolved into the water.
The pressurized water, containing the dissolved air, is taken out from the bottom of the vessel, laminated in the depressurization valve and finally mixed with the raw water before entering the flotation tank.
The PRV is suitable for upgrading of competitor DAF clarifiers.