Grit Removal
The process for grit removal in a municipal or industrial wastewater treatment plant is usually placed just downstream the screening and before the sewage and wastewater treatment.
A grit removal plant reduces clogging and wearing problems for the equipment, installed downstream.
This treatment, besides reducing the organic load for the subsequent treatment process, reduces the formation of scum.
The grit removal process takes place in tanks called sand traps in which is exploited the force of gravity to remove all the solid particles which have a specific weight greater than that of water.
The sand traps are tanks in which the sewage flows at a speed such as to create the settling of the solids dragged in suspension or for transport of the bottom.