Published on Jul 18, 2016

How to design effective grit removal systems is today's topic in this 2 minute industry update. We'll help all of you wastewater pros with two design tips. Let's get started.
The first design tip is sizing. Remember: one sizing formula does not fit all equipment.
When sizing equipment, the forced vortex with v-force baffle unit sizes its equipment based on peak flow and optimum inlet channel velocity. Stacked tray units use surface overflow rates. Sloped bottom units use flow. These sizing methods are unique to each style of equipment.
Don't make the mistake of using the wrong sizing method. For example, if you were to use the surface overflow rate on a forced vortex with v-force baffle, you would oversize the unit by a factor of 12. You would be oversized, over budget, and without enough wastewater flow to make the equipment work.
The second design tip is particle size. The forced vortex with v-force baffle unit handles all particle sizes, 105 micron and above at the peak flow rate and below without derating the unit.
The stacked tray unit must consider the particle size on every design. Because the unit is sized based on settling rates, the specific gravity of the grit and shape of the grit is a concern when designing the unit. The stacked tray unit also derates the efficiency at peak flows.
And finally, the sloped bottom units also handle a wide range of grit particles, 150 micron and below.
These two design tips will help you become a grit removal design pro. Visit gritthefacts.com for more info.