Desander is a structure designed to retain the sand that sewage or surface waters bring to prevent them from entering the adduction canal, hydroelectric plant or treatment process and obstructing it by creating serious problems.
There are several types of sanders. The main ones are:
The desired water velocity is 0.3 m / s. Desarenador longitudinal
Its operation is based on the reduction of water velocity and turbulence, thus allowing solid material transported in suspension to be deposited at the bottom, from where it is removed periodically.
Normally, two parallel structures are constructed to allow one of the structures to be cleaned while the other is operating. Vortex Vessel
Vortex type desorption systems are based on the formation of a mechanically induced vortex (vortex), which captures the solids in the central hopper of a circular tank. Vortex desander systems include two basic designs: flat-bottomed cameras with small apertures for collecting sand and chambers with an inclined bottom and a large aperture leading to the hopper. As the vortex directs the solids to the center, rotating paddles increase the speed sufficiently to lift the lighter organic material and thereby return it to the flow passing through the sand chamber.
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