Grit Flow Rate for Pump Sizing

Hi Melanie,

I would think that the grit values are: (ft³ of dewatered grit)/(gal of water "carrying" the grit). This is an ASSUMPTION, one of you CivE's out there correct me if I'm wrong!

For % solids:

Let's assume that the dewatered grit (still moist) is 70% grit and 30% water BY VOLUME.

This means that the gallons of DRY GRIT = (0.7)(7.481 gal/ft³)(ft³ of dewatered grit)

The % solids (by VOLUME) = 100 x (gallons of DRY GRIT)/(gallons of water "carrying" the grit).

Example:

Grit value = 1000 ft³ of Grit/1,000,000 gal H₂O

Gallons of DRY GRIT = (0.7)(7.481 gal/ft³)(1000 ft³ of dewatered grit) = 5236.7

% solids (volume) = (100)(5236.7 gal DRY GRIT)/(1,000,000 gal H₂O) = 0.52%

Hope this helps,

Mike