The classification of membrane filters is based on the size of particles retained in raw water. Membrane holes are divided into microfiltration membranes (MF), ultrafiltration membranes (UF), nanofiltration membranes (NF), and reverse osmosis membranes (RO) are all types of membrane filtration processes that are commonly used in various industrial and scientific applications. The classification of these membrane filters is based on their pore size, membrane material, and application.
Microfiltration (MF) Membranes: MF membranes have a relatively large pore size ranging from 0.1 to 10 microns. They are used to remove suspended solids, bacteria, and some viruses from water or other liquids. They are commonly used in the food and beverage industry, as well as in wastewater treatment. Such as PP membranes filters, Microporous Glass Fiber Membrane Filter, PES Membrane Filter.
Ultrafiltration (UF) Membranes: UF membranes have a smaller pore size than MF membranes, ranging from 0.001 to 0.1 microns. They are used to remove larger particles, bacteria, viruses, and some macromolecules from water or other liquids. They are commonly used in the dairy, pharmaceutical, and biotech industries, as well as in drinking water treatment.
Nanofiltration (NF) Membranes: NF membranes have a smaller pore size than UF membranes, ranging from 0.001 to 0.01 microns. They are used to remove divalent and multivalent ions, organic matter, and some small molecules from water or other liquids. They are commonly used in the food and beverage industry, as well as in desalination and water softening applications.
Reverse Osmosis (RO) Membranes: RO membranes have the smallest pore size of all membrane filters, ranging from 0.0001 to 0.001 microns. They are used to remove dissolved salts, organic matter, and some small molecules from water or other liquids. They are commonly used in desalination, water treatment, and some industrial processes.
These four kinds of membrane filters have different applications as their separate particle size ranges show. MF membrane filter is to remove the colloid and high molecular organic matter. NF, as a transition, is responsible for removing substances between UF and RO, such as rihalomethane, odor, chroma, pesticides, soluble organic matter, Ca, Mg, etc. RO’s duty is the removal of salt and inorganic salt. Not as verstile as the NF membrane, but it still plays a significant role in the membrane filtering field.
In addition to the above four, there are ion-exchange membranes and gas permeation membranes. MF, UF, NF, and RO separate solids from the liquids because of pressure. However, Ion exchange membranes are driven by electricity to separate salt molecules and promote the desalination of seawater. A gas permeation membrane is a new type of membrane that can concentrate ethanol and desalinate seawater through the gas.
6 Characteristics of The Membrane Filter
Membrane filter can purify, separate or concentrate solution through separation, which is between microfiltration and nanofiltration.
Membranes filter is effective barriers for suspended particles and colloidal substances. Membranes filter can also effectively remove “two insects, algae, bacteria, viruses, and aquatic organisms, so as to achieve the purpose of solution purification, separation, and concentration. Its main characteristics are as follows:
1. The removal efficiency of impurities is high and the quality of produced water is much better than that of traditional methods. 2. Eliminate or greatly reduce the use of chemical agents to avoid secondary pollution. 3. The system is easy to automate and has high reliability. Simple operation, facilities only open, close two gears. 4. It has good chemical stability, acid resistance, alkali resistance, and hydrolysis resistance, and can be widely used in various fields. 5. The heat-resistant temperature can reach 140 C. It can be sterilized by ultra-high temperature steam and ethylene oxide. It can be used in a wide range of PH. It can be used under strong acid and alkali conditions and various organic solvents. 6. High filtration precision, can effectively filter 99.99% colloid, bacteria, suspended substances and other harmful substances in water.