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All grit washers consist of a separation/washing tank and a discharge screw. It is the FSM engineering that sets their grit washers apart. FSM focused on three major objectives as they made their design decisions:
| 1. | The unit should achieve maximum separation of the finest grit particles. |
| 2. | The unit should operate with the lowest water consumption at the lowest pressure. |
| 3. | The maximum amount of organic material should be removed from the grit. |
The organic ladened grit slurry is fed into the wash tank via in inlet flange. Organic matter is held in suspension and floated off while the grit settles in the tank. With the addition of wash water, the settled grit is separated from the organic material using a stirring device and up-current washing technique. The washed grit settles to the bottom of the tank and is discharged via a shafted screw.
The end result is a clean, dry grit with less than 3% organic material and the elimination of odor and vector attraction. The dry weight of the grit is typically 85-90%.
Did You Know?
| • | FSM has a tub style unit that produces the same results with a much reduced space requirements. |
| • | Designed for use with plant water. |
| • | Can accept pumped flows up to 600 gpm. |
| • | A dry feed design is available for discharge from existing classifiers or combined pre-treatment plants. |
