High-efficiency rotary screen removes solids from wastewater

CST Wastewater Solutions has introduced its latest-technology Rotary Drum Screen for high efficiency screening of industrial and municipal wastewaters.

Featuring all-stainless construction including base frame – and being fully enclosed for OH&S odour and aerosol control -  the new design advances rotary drum screen technology well into the 21st century, said Michael Bambridge, Managing Director of CST Wastewater Solutions.

Advantages of the screen, enhancing durability, hygiene and serviceability, include:

  • non-lubricated chains and non-metallic drive sprockets
  • upgraded running wheel design
  • no mechanical parts  in contact with screened solids
  • corrosion resistant
  • designed to handle high fat and grease loadings
  • self-cleaning
  • optional wedgewire slots or perforated holes screening

"The new Rotary Drum Screen has a low investment cost, as well as low operational and maintenance costs. Our wide range of in-house experience means we offer custom-designed machines if needed," Mr Bambridge said.

Typical industries to use the Rotary Drum Screen include general food processing (vegetables, fruit, coffee, starch processing) , beverages (beer, wine, juice, soft drinks), slaughterhouses and abattoirs, tanneries, pulp and paper mills, textile plants, plastic manufacturers and many more industries.

Municipal treatment plants also use the screens for fine screening of raw sewage, pre MBR (membrane bioreactor) screening, and sludge thickening.

"The full stainless screen design is highly versatile, accommodating either slot or hole configurations, depending on the application," said Mr Bambridge

The internally fed Rotary Drum Screen can use  wedgewire or perforated hole drums.Wastewater passes into the internal feed tank before overflowing the weir onto the screen face of the drum. Solids are collected on the screen face, while the screened water passes through the screen  face under gravity. Collected solids are discharged via the screen drum mouth.

The internal feed tank controls inlet velocities  and distributes the flow evenly onto the screen face.

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