Mechanical Operations
A filter press is

Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure
Having prohibitively high maintenance cost
Not suitable, if the liquid is the main product
A batch filter

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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

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

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