Classify the types of membranes based on the pore size diameter. Specify the advantages of each...
Classify the types of membranes based on the pore size diameter. Specify the advantages of each type in term of contaminants rejection.
Homework Answers
The membranes are classified into 4 types based on their pore size
1. Microfiltration membrane(MF)
2. Ultrafiltration membrane(UF)
3. Nanofiltration membrane(NF)
4. Reverse osmosis membrane(RO)
Microfiltration:- the pore size ranges from 0.1 micron to 1 micron which is measured by porometers. Since the cake forme on the membrane acts as a dynamic membrane, all the tiny molecules with low molecular weight are rejected by this membrane.
Ultrafiltration:- the pore size varies between 0.01 micron to 0.1 micron which is measured by promoters. Rejects the solute particles same as microfiltration membrane.
Nanofiltration:- the pore diameter varies between 1 nm to 10 nm. It is not effectively measured by prometers or porometer. This membrane is good in rejecting divalent ions like Ca2+, Mg2+ etc., With an efficiency of 70 to 95%.
Reverse osmosis:- no pore size diameter can be identified by using even scanning electron microscopy for this membrane. This membrane is good in rejecting monovalent ions like Na+, Li+, K+ etc., With an efficiency of 90 to 99%.
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Classify the types of membranes based on the pore size diameter.
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