Sand Silo
Effluent contaminated with grit and organic matter discharges tangentially at a certain level of the hopper, and Slow rotational movement is produced. This rotational movement together with sufficient retention for variations of particle settling velocities induce the grit and sand to spiral and settle by gravity t
Maintained flow velocities prevent any suspended organic matter from settling with the mineral.
Influent water gets back to the treatment operation, while settled grits discharge through a quick opening gate valve.