EXPLANATION

Continuous, Automatic Filter Back-Flushing System

• Forces permeate back through membrane to dislodge accumulated material.
• Produces high-pressure wave front through membrane surface.
• Simple design and operation

Effectively Cleans Surface

• Restores membrane permeability (maintains effective filtration surface)
• Minimizes foulant layer compaction (permanent pore blockage)
• Limits bacterial adhesion (biofilm formation)

The required backpulse volume for a given application can be estimated from assuming that the required backpulse volume to dislodge accumulated material at the membrane surface is the volume of liquid necessary to move dislodged material from the membrane surface across the viscous sub-layer into the high-velocity, cross-flow stream. This concept is illustrated below:

A typical backpulse system contains a piston driven by compressed air. The piston periodically drives fluid back into the Filter Module cleaning the fouling layer from the Element. This is done at a rate that balances the average flux production against the frequency at which chemical cleaning of the elements must be done.
See a detail animation of a typical backpulse system