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Tell you about membrane filtration technology and several common membrane separation processes

Industry News
Release time:
2020/10/27 20:05
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Tell you about membrane filtration technology and several common membrane separation processes
Membrane filtration technology
     The pressure-driven membrane separation technology is also called membrane filtration technology. It is an advanced method of advanced water treatment. According to the different membrane selectivity, it can be divided into reverse osmosis (RO), nanofiltration (NF), ultra Filtration (UF) and microfiltration (MF), etc.
Ultrafiltration membrane filtration technology (UF)
     Ultrafiltration membrane (UF) is a membrane process between microfiltration and nanofiltration. It uses the principle of sieving to separate. The molecular weight cut-off for organics is optional from 3000 to 300,000 Daltons. It is suitable for macromolecular substances and small Separation, concentration and purification of molecular substances.
Microfiltration membrane filtration technology (MF)
     Microfiltration membrane (MF) filtration technology is a screening process, which is a kind of precision filtration. It can be divided into two types: surface type and deep type. There are two types of microfiltration operations: deadend and crossflow. The former type of membrane is used for thinner liquid and small-scale applications, and most of the filter elements are disposable. The latter is also called tangential flow operation or cross-flow filtration, which is suitable for large-scale industrial applications. This type of membrane is characterized by periodic online cleaning and regeneration to restore the membrane's filtration performance.
Reverse Osmosis Technology (RO)
     Osmosis is a process in which water flows spontaneously from the side of the dilute solution through the semi-permeable membrane to the side of the concentrated solution. The concentrated solution is continuously diluted with the continuous inflow of water. When the pressure generated by the flow of water to the concentrated solution is sufficient to prevent the continuous inflow of water, the permeation is in equilibrium, that is, dynamic equilibrium is reached. When pressure is applied to the concentrated solution and the pressure is greater than the osmotic pressure, the water in the concentrated solution will overcome the osmotic pressure and flow to the dilute solution through the semipermeable membrane, making the concentration of the concentrated solution greater. This process is osmosis The opposite process is called reverse osmosis.