ANDRITZ Separation - ANDRITZ Group

- Shaftless Dewatering Screw Screen



To meet the growing demand of small sewage treatment plants, ANDRITZ has added the Aquaspir screen SC to its product line. This shaft less screw screen not only screens and conveys the solids, but also dewaters and compacts the screenings - all in a single integrated unit.

Screening takes place in the filtration zone, which comprises either a filtering basket or a semi-circular perforated plate, depending on the mesh size required. The solids captured in the filtration zone are conveyed automatically out of the flow by the shaft less screw. A spiral brush attached to the lower end of the screw ensures that the screening mesh is cleaned continuously. In the transportation zone, the heavy duty screw is supported by hardened steel wearing bars which are bolted to the stainless steel body of the Aquaspir screen SC, allowing them to be removed easily for maintenance. When the solids arrive at the compacting zone, located at the end of the screw, they pass into a stainless steel pipe which is slotted to allow the water to escape during compaction. Two spray pipes fitted with nozzles ensure that the plug of solids in the compacting zone is thoroughly washed and all the excess organic material is returned to the effluent.

The AquaSpir screen can be installed quickly and easily in an existing channel for gravity flows. If there is no channel, the screen can be mounted in a tank and the effluent is usually pumped to the screen. The equipment can be installed either inside or outside, and the compacting zone can be supplied with heating elements to protect it against freezing.

For specific applications such as septic sludge, there is a special AquaSpir version called CombiSpir, where the screen is mounted in a fully enclosed tank equipped with level sensors, specific cleaning device, and control panel.

  • Complete stand-alone unit
  • Easy to install
  • Ready to start

  • Automatic bagging
  • Washing of screenings in the conveying zone using an additional spray pipe to optimize cleaning of filtration zone


  • Industrial (dairies, tanneries, paper mills, textile plants, canning plants, slaughterhouses, septic sludge, etc.)
  • Municipal (sewage effluent, domestic effluent, potable water), or process

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