Mechanical Operations
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge

Increases
Remains constant
Decreases
Increases linearly

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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

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

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