Is a cyclonic sand sedimentation tank above or below ground

The cyclone sedimentation tank is above ground. Cyclone sand sedimentation tank is the use of mechanical force to control the flow of water and flow velocity, accelerate the sedimentation of sand particles and make the organic matter with the water flow away from the sand sedimentation device, on the ground, mainly using the rotation of the mechanical impeller to control the flow rate of water into the flow rate and flow, so that the sand in the centrifugal force and the effect of gravity, along the wall of the pool was accelerated by a helix to accelerate the sedimentation, and at the same time the organic matter in the action of the water flow.