The grit classifying with the HIDROSAND ® effect
The feed to the system of the grit mixture, organic matter and water is made by the HIDROSAND ® tulip. By means of the HIDROSAND ® effect, the rotational entry flow passes from vertical direction to horizontal, and simultaneously it goes to the container’s walls. The figurebelow shows that the speed of the flow is yet to high at the entry of the equipment (red area) and that it is significantly reduced (green area).
So, the frit grains, organic material, etc., are separated due to the combination of two effects: the deviation of the flow and the reduction in velocity. This allows the sedimentation of the solids in the lower part of the tank. This special flow conditions result in a performance higher than 95% for grit grains of size higher or equal than ´3d 0.2 mm.
The separation grade depends of the sedimentation velocity of the solids (density and size have influence). This supposes that not only grit is separated, but also organic matter.
Treatment in the fluidized grit bet.
The separated grit is washed, thus the organic matter is separated from the grit. This takes place in the bottom of the tank due that the conditions in this place are ideal because of the low flow velocities.
For the washing of the sands a service water flow is introduced by the lower part of the tank that creates a fluidized bed of grit which allows the separation of the organic matter from the grit, with base in the different densities and independently of the size of the particle.