AMFS Unique Filtration System No Fouling

Our Filtration System uses a different method to produce intense shear waves on the face of a membrane — vibrations. In our Filtration System, the feed slurry remains nearly stationary, moving in a leisurely, meandering flow between parallel membrane leaf elements. Shear cleaning action is created by vigorously vibrating the leaf elements in a direction tangent to the faces of the membranes.

The shear waves produced by the membrane’s vibration cause solids and foulants to be lifted off the membrane surface and remixed with the bulk material flowing through the membrane stack. This high shear processing exposes the membrane pores for maximum throughput, typically between 3 and 10 times the throughput of conventional cross-flow systems. Our membrane filter pack consists of eaf elements arrayed as parallel discs and separated by gaskets. The disc stack resembles records on a record changer with membrane on each side.

The disk stack is oscillated above a torsion spring that moves the stack back and forth approximately 7/8 inches (2.22 centimeters). This motion is analogous to the agitator of a washing machine but occurs at a speed faster than that which can be perceived by the human eye. The oscillation produces a shear at the membrane surface of about 150,000 inverse seconds (equivalent to over 200 G’s of force), which is approximately ten times the shear rate of the best conventional cross-flow systems. More importantly, our is focused at the membrane surface where it is cost effective and most useful in preventing fouling while the bulk fluid between the membrane disks moves very little.

Because our System does not depend on feed flow induced shearing forces, the feed slurry can become extremely viscous and still be successfully dewatered. The concentrate is essentially extruded between the vibrating disc elements and exits the machine once it reaches the desired concentration level. Thus, our ystem can be run in a single pass, eliminating the need for costly working tanks, ancillary equipment and associated valving. Each of our Mobile and Portable Filtration Equipment’s disc pack hold volume up to 1,500 SF (130 sq. meters). Membrane area is less than 50 gallons (189 liters) for each filter. As a result, product recovery in batch processes can be extremely high. Waste after draining the stack is less than 3 gallons (11 liters).