The wastewater grit classifier receives the liquid with grit into the inlet hopper where the grit settles to the bottom by means of gravity. The inclined screw captures the settled grit and transports it to the discharge chute where it is received by a suitable bin or conveyor.


  • Separation of grit from liquid flows
  • Receives settle-able grit in liquids from upstream process
  • Grit settles in inlet hopper by gravity
  • Organic material is removed by turbulence in the inlet hopper
  • Additional washing by optional air or water jet agitation
  • Optional fats, oils and grease removal in inlet hopper
  • Inclined shaft-less or shafted screw transports settled grit to discharge end
  • Grit dewaters by gravity in the transport zone
  • Dry grit is discharged vertically into receiver bin or conveyor
  • Trough wear protected by metal or HDPE liner

Technical specifications:

Material 304ss, 316ss, carbon steel HDG
Screw 304ss, 316ss, micro alloy steel
Trough protection 304ss, 316ss wear bars or HDPE liner
Screw diameter 240 – 280mm
Screw type shaft-less or shafted
Transport length 3710 – 6240mm
Inclination 25 deg
Discharge height 1500 – 2400 from ground level
Flow rate 20 – 100 m3/h wet solids 2 – 5% DS
Grit separation 95%  of particles >200 micron
Organics removal 50 – 90% with additional washing
Grit extraction  2000 kg/h at 90% DS