suspended solids


Microfiltration systems for suspended solids filtration

They are used where the traditional “through flow” filtration cartridge systems can’t be used because of:

  • Especially small particles dimensions (smaller than one micron)
  • Need of frequent cartridge replacement

It is possible to use microfiltration membranes that operate on the principle of tangential filtration.

Filtration is usually considered in the traditional way: a fluid flows perpendicularly through a filtration medium, thus separating the filtrate. When the filter  becomes dirty, it is necessary to wash or replace it (cartridges, etc.)

In tangential filtration, on the other hand, the fluid to be filtered is separated, through a semi-permeable membrane, in two flows, the permeate and the concentrate.

The permeate is the fraction which goes through the membrane.

The concentrate is the fraction which, enriched in solutes or suspended solids, does not go through the membrane.

The fluid flows inside the membrane at a very high speed, parallel to the surface of the membrane itself, keeping it constantly clean.

One of our special applications is the separation of metallic copper and other inert materials (pumice, silicon carbide …), with a particle size even smaller than 0.2 microns.

This system operates on a pre-sedimentation stage, one cyclone centrifugal separation stage and a microfiltration stage with ceramic membranes with an excellent resistance to abrasion and chemical inertia.

The clear permeate can then be reused or discharged.

 


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