The grease traps due to their shape and volume, assures the time necessary for smaller density particles (oils, fats, floating colloidal materials, etc.) than water, to rise up on surface, and through its own scraping system these will be transferred in the chutes, from where they will be discharged.
Grease traps are those equipment that, because of their shape and volume, assures the right time (the water speed is reduced, so the lighter particles rise to the surface) for the particles which smaller density than the density of water to rise up (oils, fats, Colloid material floating, etc.), and through its own scraping system these will be transferred in the chutes, from where they are being discharged.
To raise the efficiency of grease traps, it can be used aerators which increase the flocculation process.
The retention time of the equipment is 20- 30 min, therefore their size are smaller than decanters.