Operating principle

  • Lamella clarifiers have been used for many years for sludge sedimentation. The effluent runs counter-current through a pack of lamellas housed in an appropriate tank. The effluent runs in the opposite direction to the sludge.
  • Plates are organised in a chicane layout inside the tank to ensure that the effluent is uniformly distributed.
  • The lamellas consist of rigid thermoformed polystyrene sheets, treated with an anti-UV additive and welded together to form parallel channels. The type and spacing of the lamellas is determined by the characteristics of the wastewater.
  • R&O can supply a turnkey version, with tank and accessories, or just the lamella block in a stainless steel frame, to be inserted into existing or specific tanks.

Main applications

  • Sedimentation of biological or physical-chemical sludge.
  • Clarification / flocculation
  • Drinking water treatment
  • Clarification as part of tertiary treatment
  • Precipitation of metal hydrates
  • Improved sedimentation of an existing plant
  • Rainwater treatment (storm tank)


  • In the all-in-one version, the parts are all manufactured out of painted carbon steel, except the overflow which is made of 304 stainless steel.
  • Customised materials and applications can be supplied on request. The lamella pack of appropriate thickness is housed in a stainless steel frame.


  • High separation efficiency
  • Small footprint
  • Low investment cost
  • Ease of installation
  • Modularity
  • Minimum maintenance

Download this product’s specifications

Contact an R&O engineer