Sand Washer



Standard grit trap contents have an organic proportion of 50 to 80 %. Conventional sand washers are able to dewater the grit trap settlings only partially. But, the high organic content and the lack of dry substance bring on unpleasant odour, high weight and, as a consequence, high costs for disposal. With the PWL Sand Washer the organics in the grit trap can be nearly completely washed out. This results into a reduction of mass of up to 80 % and might cause cost savings of up to 90 % when being disposed on a construction waste landfill.

This procedure can be applied in industry, as well, to separate valuable materials from waste. Due to the separate discharge of the various fractions they can be further treated, recycled or disposed. Thus, valuable materials can be returned to the production process and waste material be disposed at low costs and correctly sorted.


The PWL Sand Washer is fed with a sand-water-mixture. The settled sediment mixture is conveyed by a spiral to the directly connected wash reactor. The light-weight parts passing through the sediment stock are separated with wash water and/or air supported by the rotating agitator. Then, they are flushed out via the overflow for further treatment.

The washed solids sediment at the reactor bottom is discharged in cycle operation by a low-wear spiral. The defined remaining quantity of washed sediment in the agitator tank serves as separating layer and avoids discharge of contaminated material. Height and discharge quantity of the sediment stock can be modified and are adjustable to site conditions.

Technical Features

  • material: stainless steel AISI 304, gas-shielded welding, pickled and passivated
  • spirals: special steel
  • agitator: hardened steel
  • drive: double painted

pdfLeaflet DL S
Sand Washer