Author: waterfiltech

Originally implying a thin, microporous or semi-permeable plastic sheet, the term ‘ membrane ’ is now applied to any filter medium that is capable of removing particles below 0.1m. The…

The cross-flow principle ( Figure 3.76) began with the hollow fibres used in reverse osmosis, and has expanded to become one of the most important components of the filtration industry.…

There are two distinct modes of liquid filtration. In one, the filter medium sits across the fluid flow channel, so that all of the liquid must pass through the medium,…

A screw press is a continuously operating machine used to squeeze liquid from a mass of fibrous solids, such as in the recovery of animal or vegetable oils, or further…

A small group of filters is classed together as variable volume devices, so called because the filtration zone containing the collected solids is compressed once filtration is complete, in order…

Belt presses (or press belts or double belt presses as they are equally usefully known), as their name implies, use the pressure of a belt on a mass of wet…

The great success of the filter press has led to several other designs of filter employing the plate principle, most notably the vertical filter press (or tower press as this…

The main development of the filter press from the simpler versions just described has been to include an impervious elastomeric sheet in each plate compartment (one for each plate on…

The first main development from the basic plate and frame structure saw the alternating plate and frame replaced by a single set of plates, each two sided, with a  raised collar…

Even in its most highly automated form the filter press is a relatively simple machine, comprising a series of flat filter chambers mounted vertically one beside the other, between two…