Sand classifier

Operating principle

  • This equipment is ideally installed on the solid outlets of grit traps in wastewater treatment plants, and is designed to separate the liquid phase from the mineral phase.
  • The design of the inlet diffuser and the specific shape of the reception tank ensure optimal sedimentation and separation.
  • The low rotation speed of the screw
    (5 rpm) ensures efficient treatment of the sand and grit and better draining of the end product.
  • The sand & grit-loaded effluent is introduced from the top of the tank by pumping or by gravity.
  • A specific deflector and the particular shape of the tank help with sedimentation while reducing turbulence.
  • The sediment particles measuring between 150 and 200 μm are simply and efficiently separated.


  • AISI 304L or 316L stainless steel tank
  • HCS (High Carbon Steel) (extra-hard) abrasion-resistant screw blade
  • Throughput: up to 130 m3/h
  • Treatment performance: 90% of particles > 200 μm
  • Sand extraction rate: up to 1.3 m3/h
  • Adaptable conveyor length


  • Robustness
  • Reduced maintenance (few wearing parts) and low initial investment
  • High-resistance screw blade
  • Efficient: 90% of particles > 200 μm
  • Rinsing option for limiting organic materials content
  • Clean: cover and pipe connections to odour removal unit
  • Stands and mounts suited to site
  • Throughput up to 130 m3/h

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