Grit Collectors
Grit Collectors

Grit Collectors

Fairfield Service Company

Bucket Elevator

This grit collector consists of a screw conveyor with a vertical bucket elevator and dewatering screw. Grit collector is installed in a regular settling tank designed for a velocity of approximately one foot per second at average sewage flow and sized for not less than one minute retention. Forced air can be introduced into the tank, at period of low sewage flow by means of air diffusers to produce hydraulic turbulence that simulates the normal designed velocity to keep the organic from settling along with the grit.


The Screw Compactor consists of
  • Bottom connecting screw
  • Buckets
  • Collector chain
  • Baffles
  • Water spray piping
  • Aeration system
  • Dewatering screw conveyor
  • Shafting
  • Bearings
  • Collector chain sprockets
  • Head enclosure
  • Drive assembly

Chain & Bucket/Flight Grit Collector

This grit collector consists of chain and buckets installed in a long narrow horizontal settling channel, dewatering vertical section to elevate the grit from the channel, and screw conveyor to discharge grit into a container or re-circulate the grit back into the channel during periods of maximum flow. This re circulation reduces the organic matter that has settled along with the grit during periods of low sewage flow.

This grit collector consists of chain and flights installed in a long narrow horizontal settling channel. It consists a dewatering discharge section inclined 30 degrees from the horizontal designed to discharge the grit into a container or re-circulate it back into the channel.

The collectors consist of

  • Bucket.
  • Flights.
  • Wear shoes.
  • Shafting.
  • Bearing.
  • Collector chain.
  • Collector chain sprocket.
  • Head enclosure.
  • Return track.
  • Drive assembly.

Grit Classifiers

Grit Clasifiers can be installed at the elevator discharge section to more efficiently remove organice matter from he grit. The dewatering screw consists of a rectangular water-tight tank with an automatic wash water metering device with the inclined screw discharging the washed grid into a container.

The tank is built of not less than 1/4 -inch steel reinforced with structural steel & provided with suitable flanged inlet from the bucket elevator,1 inch diameter wash water inlet ,steel baffle ,overflow box having adjustable weir, and suitable diameter effluent pipe.

A volume of approximately 8 cubic feet in the washer tank is required for each cubic foot per hour of grit to be washed. The wash water surface and is delivered to the tank at about 5 pounds per square inch pressure.A portion of the wash water can be introduced in to the inclined section of dewatering screw by means of adjustable spray nozzles.

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Fluid Technology, LLC

Colorado 303-233-7400
Utah 801-268-0600
New Mexico 505-255-6565
Arizona 602-252-1726


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