Question

Pore size Nano-filtration membrane ranges from __________

(a) 0.1- 5µm

(b) 0.1- 0.01µm

(c) 0.001- 0.01µm

(d) 0.0001- 0.001µm

The question was posed to me by my college director while I was bunking the class.

This interesting question is from Membrane Filter in portion Building Blocks of Dairy Processing of Dairy Engineering

Answer 1

The correct answer is (c) 0.001- 0.01µm

Explanation: Nanofiltration has a pore size range of 0.001-0.01um. NF membranes can filter particles up to and including some salts, synthetic dies and sugars, however it is unable to remove most aqueous salts and metallic ions, as such, NF is generally confined to specialist uses.