Question

What is the pore size in membrane filter?

(a) 0.12–0.25 μm

(b) 0.22–0.45 μm

(c) 0.32–0.55 μm

(d) 0.52–0.65 μm

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

My question is based upon Filtering Medium Resistance topic in section Filtration of Food Processing Unit Operations

Answer 1

Right choice is (b) 0.22–0.45 μm

For explanation: Membrane filter has the pore size of 0.22–0.45 µm with thickness 150 µm, restricts the passing through activity of Pseudomonas aeruginosa and other bacterial species.