For which phase filter aid is used to filter?(a) Gas and liquid(b) Solid and Liquid(c) Gas(d) GelI had been asked this question in an online interview.My query is from Filtration topic in section Unit Operations of Bioprocess Engineering

For which phase filter aid is used to filter?(a) Gas and liquid(b) Sol

1.	For which phase filter aid is used to filter?(a) Gas and liquid(b) Solid and Liquid(c) Gas(d) GelI had been asked this question in an online interview.My query is from Filtration topic in section Unit Operations of Bioprocess Engineering
Answer» 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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