![]() This washing is carefully controlled so that dilution of the filtrate is minimal. A number of spray jets may be carefully positioned so that water can be applied to rinse the cake. However, just before discharge of the filter cake, air pressure may be applied internally to help ease the filter cake off the drum. The interior of the drum is divided into a series of compartments, to which the vacuum pressure is normally applied for most of each revolution as the drum slowly revolves (~ 1 rpm). The slurry is fed on to the outside of the revolving drum and vacuum pressure is applied internally so that the filtrate is drawn through the filter, into the drum and finally to a collecting vessel. ![]() The filter consists of a rotating, hollow, segmented drum covered with a fabric or metal filter which is partially immersed in a trough containing the broth to be filtered (Fig. ![]() Large rotary vacuum filters are commonly used by industries which produce large volumes of liquid which need continuous processing. ![]()
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