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Beer Filtration
Cartridge Filters
Background
Although cartridge filters are not used for rough or polish applications they are suitable for sterile filtration. Filter cartridges and housings are shown in Figures 15.5 and 15.6, respectively. It is common to have these filters downstream as a final step after using powder filters and sheet filters. In general, it is not economical to use cartridges as surface filters; nevertheless, they are sometimes used for surface filtration. Typically, cartridge filters are constructed for depth filtration.
Cartridge filters must be stacked or manifolded, usually in a single housing, in order to handle a meaningful flow. The large commercial brewers usually install a duplex trap system, in which the second filter is switched automatically into service upon registration of a high-pressure drop across the first filter. The first filter is then regenerated with hot water while the second filter is in operation.
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