SANDWASH - Grit Washer

Clean grit without organics
SANDWASH Grit Washer

This is designed for those applications where any visible organics on the grit is unacceptable.

Fed from a vortex, aerated grit chamber, detritor tank, or any other means of grit separation either by airlift or grit pump, the SANDWASHTM grit washer utilizes a multi-stage washing process to remove organics and other larger, lower density objects to be returned to the downstream biological treatment. SANDWASHTM creates a fluidised bed where the lighter organic particles are separated from the dense grit particles. A central stirrer keeps the grit in motion. Once the organic material is removed the clean grit is transported via a shaftless spiral conveyor.

Technical details

  • Available in hydraulic capacities ranging from; 1l/sec (950GPH)  to 30l/sec (29000GPH).*
  • Solids handling capacities ranging from; ≤500kg/hr (1100lb/hour) to 2,000kg/hr (4400lb/hour).*
  • Solids capture and extraction, typically 95% of particles ≥0.2mmØ. Grit S.G. 2.65 with an average B.D of 1600kg/m³ (100lb/ft3).*
  • Organic content residue in grit – typically ≤5%
  • DS of washed and dewatered grit - typically 75% to 85%.*

*depending on site conditions.



Product benefits

  • The slow speed of the inclined grit dewatering conveyor minimizes wear whilst discharging high quality grit.
  • The intermediate stirrer prevents blockage to the organics discharge outlet.
  • The rotation of the stirrer during the washing cycle promotes the separation of residual grit from organic which rises and flows over the weir as washing water provides an upward flow stream.
  • The intermittent opening and closing of the actuated ball valve allows accumulated organics in the grit washer tank to be flushed out from time to time.
  • Complete aftermarket support available.

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