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For which phase filter aid is used to filter?

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in Bioprocess Engineering by (80.7k points)
For which phase filter aid is used to filter?

(a) Gas and liquid

(b) Solid and Liquid

(c) Gas

(d) Gel

I had been asked this question in an online interview.

My query is from Filtration topic in section Unit Operations of Bioprocess Engineering

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The correct option is (b) Solid and Liquid

The explanation is: Filtration is the separation of solids from liquids by forcing the liquid to flow through a porous medium and depositing the solids on the medium. A filter aid (finely divided material added to the liquid to be filtered) helps control flow and solids removal.

Precoat filtration is a type of mechanical filtration that can be used to clarify liquids. Filter aids such as diatomaceous earth, perlite and cellulose enables a liquid to pass through while retaining the haze-causing particles.

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