What type of filter contains a cloth screen to retain the solids being filtered?
A. Leaf filter
B. Rotary drum filter
C. Fixed bed filter
D. Plate-and-frame filters
A. Incorrect. A leaf filter uses a filter aid on a fine mesh screen, located inside the filter vessel, to hold the filtered material.
B. Correct. A rotary drum filter, also referred to as a cake filter, contains a cloth screen on a drum that retains the solids being filtered.
C. Incorrect. In a fixed bed filter, the filtering medium is stationary in the filter unit and held in place by a support structure. The process fluid passes over and through the filtering medium, which traps the contaminant particles.
D. Incorrect. Plate-and-frame filters are used to remove liquids from a slurry feed by using a deep filtration process that includes clarification and prefiltration.
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