RisingSun Membrane Technology (Beijing) Co., Ltd

High quality products, competitive price, being the core supplier in membrane industry!

Home > News > Content
What Is The Separation Ability Of Membrane Technology?
- Aug 08, 2018 -

Reverse osmosis is currently the most sophisticated liquid filtration technology. The reverse osmosis membrane retains inorganic molecules such as dissolved salts and organic substances with a molecular weight greater than 100. On the other hand, water molecules can pass through the reverse osmosis membrane freely, typical solubility. The salt removal rate is >95 to 99%. Operating pressures range from 7 bar (100 psi) for brackish water to 69 bar (1,000 psi) for seawater.

Nanofiltration can remove impurities of 1 nm (10 angstroms) and organic matter with molecular weight greater than 200-400. The removal rate of soluble solids is 20-98%, and the removal rate of salts containing monovalent anions (such as NaCl or CaCl2). 20 to 80%, and the salt containing dianion (such as MgSO4) has a high removal rate of 90 to 98%.

Ultrafiltration has a separation effect on macromolecules larger than 100 to 1,000 angstroms (0.01 to 0.1 micrometers). All soluble salts and small molecules can pass through the ultrafiltration membrane. The removable materials include colloids, proteins, microorganisms and macromolecular organics. Most ultrafiltration membranes have a molecular weight cut-off of 1,000 to 100,000.

Microfiltration removes particles in the range of about 0.1 to 1 micron. In general, suspended solids and large particle colloids can be trapped while macromolecules and soluble salts are free to pass through the microfiltration membrane. Microfiltration membranes are used to remove bacteria and micro. Flocs or total suspended solids TSS, the pressure on both sides of a typical membrane is 1-3 bar.