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Rotoshear®

Internally-Fed Rotating Wedgewire Drum Screen

With more than 1,000 installations, Rotoshear® is a proven high-capacity fine screening technology for municipal wastewater treatment plants and many industries for various applications.

In wastewater treatment plants, the Rotoshear® unit is renowned as a fine screen for pretreatment and primary treatment to replace primary clarifiers. They are also used as sludge screens. Industrial users, such as meat processors, food processors, tanneries, textile mills, petrochemical plants, and recyclers, rely on it for product recovery and wastewater treatment. Pulp and paper mills use it for fiber recovery and rejects handling.  

The Rotoshear® unit is an internally-fed rotary wedgewire cylindrical screen that operates with minimal attendance. Influent enters through the inlet and flows into a headbox. The headbox fills and the influent cascades over the weirs and contacts two sides of the rotating cylinder screen. As the influent hits the turning screen, the solids are caught inside the cylinder and the liquid passes through the screen into the process or on for further treatment. Diverters on the cylinder move the solids along the length of the screen to discharge. The unit is equipped with spray bar(s) to clean the screen.

Rotoshear® has undergone continual updates to incorporate new design enhancements, and today it represents a complete family of screens. There are 12 models with custom features specific to various applications. Opening sizes range from 0.010" to 0.100" (.25 to 2.5 mm) and hydraulic capacities from 450 to over 13,000 GPM (102 to 2955 m3 /h). The material standard is 304 stainless steel, but 316 and L grades are available, as well. Heavy-duty models are available for heavy solids loadings.

Features

  • First of its kind – completely lubrication-free screen
  • Upgraded drive system with long-lasting plastic components
  • Economical option for fine screening
  • Robust proven design with 1,000s of installations
  • Many installations over 20 years old and still in operation
  • No seals to fail – minimal bypass possibility
  • Application-specific customizable options
  • Up to 20 MGD capacity per screen

Benefits

  • Reduces down-time and maintenance costs
  • Easy access to all maintenance items
  • Higher capture rate compared to conventional moving media screens
  • Upgraded drive system eliminates gear teeth engagement problems associated with direct drive systems
  • Upgraded drive system eliminates screen cylinder slippage problems caused by belt drive systems
  • Designed for pumped flow applications – no need to build channels if not needed

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