2. Operating conditions

2.1 Filtration pressure

In the case of filtration on a support, as in the case of depth filtration, it is necessary to supply a certain amount of energy to the suspension to enable it to pass through the filter: when a filter in the mass becomes clogged, its resistance to flow increases, and the same applies when the thickness of the cake increases in the case of filtration on a support.

Since pressure is nothing other than fluid energy per unit volume, there must be a positive pressure difference (henceforth referred to simply as pressure) between upstream and downstream of the filter element.

This pressure can result from the simple weight (per unit area) of the suspension above the filter. But gravity can also be replaced by centrifugal...