Mechanical Operations
For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.

Sand
Shell & leaf
Plate & frame
Rotary vacuum

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Mechanical Operations
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

Separated from the cake by dissolving solids or by burning it off
Precoated on the filter medium prior to filtration
Added to the feed slurry
All of these

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