Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?
Correct answer: A. All A, B. & C.
- A. All A, B. & C.
- B. Pre-coated on the filter medium prior to filtration
- C. Separated from the cake by dissolving solids or by burning it off
- D. Added to the feed slurry
Explanation
Filter aids may be mixed with the slurry or precoated on the filter medium to form a more porous cake with lower resistance. When necessary, the aid can be removed by dissolving or burning it, so all three statements apply.
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