Cake discharge

The very feature that distinguished the plate filter, i.e. the formation of a cake on the upper surface of the element only, makes this type that much more difficult to operate when it comes to dry cake removal. Wet discharge is as easy as with a leaf

filter, provided that the sluicing reaches every part of the plate. It is less easy, however, once the cake is dry. A set of scrapers can be used, rotating across the surface of a fixed plate (or the plates can be turned under the scrapers).

A novel form of plate filter uses centrifugal motion to clear the plates of accumulated cake. This design (Figure 3.67) has its array of plates now supported on a  shaft driven by a motor above the filter vessel. This shaft is hollow and also acts as
the filtrate removal pipe. Once the filtration stage is complete, the cake is sucked dry and the plates are then spun to throw the cake to the walls of the vessel and so down and out of the filter.

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