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What type of filter does not come under the Membrane filters?

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What type of filter does not come under the Membrane filters?

(a) Ultra filtration

(b) Microfiltration

(c) Precoat (filter aid) filtration

(d) Nanofiltration

This question was posed to me by my college professor while I was bunking the class.

I need to ask this question from Filtration in chapter Unit Operations of Bioprocess Engineering

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Correct choice is (c) Precoat (filter aid) filtration

The explanation is: A filter cake is formed by the substances that are retained on a filter. The filter cake grows in the course of filtration, becomes “thicker” as particulate matter is being retained. With increasing layer thickness the flow resistance of the filter cake increases whereas membrane filters do not use any filter aid.

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