Mixing for increased sedimentation ability

The purpose of the selector tank is to control and limit the growth of filamentous bacteria, and then to enhance the sedimentation ability of the sludge. Sulzer provides a number of solutions for creating optimal conditions in the selector. In an anoxic or anaerobic selector, submersible mixer types ABS XRW and RW, or the agitator type Scaba, can be used for intensive (flash) mixing of the recirculated sludge and the incoming wastewater. In an aerobic selector, the desired oxygen quantity can be supplied by disc diffuser system types ABS PIK or Sucoflow DS.

Wastewater treatment process-selector


  • Flow booster type ABS SB
    The reliable, energy efficient low-speed submersible unit can be used in a wide range of applications in wastewater treatment plants.

  • Flow booster type ABS XSB
    The complete answer to low-speed, highly energy efficient submersible mixing in a wide range of applications in industry and municipal treatment plants.

  • Scaba top mounted agitator
    Scaba top-mounted vertical agitators are used for mixing and agitating process liquids in many industries, including wastewater and industrial applications.

  • Submersible mixer type ABS RW
    The RW is Sulzer’s standard range of submersible mixers, economical without compromising on reliable design.

  • Submersible mixer type ABS XRW
    The XRW mixer range is Sulzer’s premium range of submersible mixers with outstanding life-cycle economy and superior reliability.

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