Flocsillator® Oscillating Mixer

The Flocsillator® oscillating flocculator is a horizontal shaft, oscillating flocculator mechanism that provides efficient and maintainable means to develop settleable floc. They are installed in water treatment flowsheets to achieve flocculation after coagulants are introduced and dispersed, and are typically upstream of the sedimentation unit in traditional surface water treatment flowsheets (prior to a DAF unit or granualar media filtration) as a direct filtration application.
  • Water treatment flocculation
  • Retrofit applications
  • Staged or tapered flocculation
  • Low speed flocculation



Flocsillator Mixer Installation

  • Flocculation is accomplished using oscillating motion
  • Low flocculation tip speeds are employed
  • All bearings and the drive shaft are located above liquid level
  • Several layouts are available

When rotation occurs in a basin, particles do not move relative to one another, do not come into contact with one another and do not form settleable floc. Baffles are not very effective in breaking up rotation of the entire basin contents. The Ovivo Flocsillator® oscillating flocculator is designed to combat rotational effects, thereby ensuring maximum floc formation. Utilizing a back-and-forth motion, fluid is not allowed to rotate about the axis of the flocculator, allowing for formation of floc. Low flocculation tip speeds ensure that formed floc will not be destroyed by the shear forces generated, as with high-speed paddle passes.

Additionally, the drive shaft and bearings are located above liquid level, so bearings are not subjected to a hostile, submerged environment, resulting in a longer bearing life. When bearings do need to be maintained or replaced, access is easy and the flocculation basin does not need to be drained. Bearings can also be lubricated more effectively because there is no concern about petroleum-based lubricants coming into contact with drinking water. The drive shaft does not pass through the basin wall, so stuffing boxes and submerged drive chains or belts are no longer required, effectively eliminating maintenance headaches.  The Flocsillator® layout can be tailored to fit the space available while still providing the desired tapered flocculation.


The unique geometry of the Flocsillator® oscillating flocculator means it does not have to rely upon induced flow to influence the entire basin. The oscillating flocculator paddles move back and forth to establish mixing currents, first in one direction and then in the other. This increases the opportunities for floc particles to contact one another without the use of baffling, which is not as effective. The paddles move close to the basin wall, first on one side of the basin and then the other, leaving only a small fraction of the basin that does not have a paddle passing through it or near it. This design provides precisely the velocity gradient required in the flocculation basin, allowing for staged or tapered flocculation.

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