Key Steps in Liquid Filtration

Filtration refers to an operation of separating solid particles suspended in liquid. A porous material is used to pass the liquid in the suspension, and the intercepted solid particles are stored on the filter medium to form a filter cake. From the distinction of filtration accuracy, it can be divided into Microfiltration, Ultrafiltration, Nanofiltration and Reverse Osmosis. Let us take a look at the differences between them.

1. Microfiltration

Microfiltration belongs to precision filtration, and its basic principle is the process of sieve separation. Microfiltration is suitable for the separation of cells, bacteria and particles. Generally used for pre-treatment. The membrane pore size is greater than 0.1 micron, and it can also be used for clarification and security filtration of general liquids. The application scope of the microporous membrane is mainly to trap particles, bacteria and other pollutants from the liquid to achieve the purpose of purification, separation and concentration. The material of HONGTEK's microfiltration membranes include: Polypropylene (PP), Polyester, Glass Fiber, Nylon, Polyethersulfone (PES), Polytetrafluoroethylene (PTFE), Polyvinylidene Fluoride (PVDF), etc.

2. Ultrafiltration

Ultrafiltration is a membrane process between microfiltration and nanofiltration. The pore size of the membrane is between 0.001 and 0.1 microns. Ultrafiltration is a membrane separation technology that can purify, separate, and concentrate solutions. Under a certain pressure, when water flows through the membrane surface, only water and small molecules smaller than the membrane pore size are allowed to pass through, so as to achieve the purpose of purification, separation and concentration of the solution. HONGTEK's ultrafiltration membrane materials include Polyvinyl Chloride (PVC) and Polyvinylidene Fluoride (PVDF).

3. Nanofiltration

Nanofiltration is a membrane separation technology between ultrafiltration and reverse osmosis. The membrane pore size is 0.0001~0.001 microns, its molecular weight cut-off is in the range of 80~1000, and the pore size is a few nanometers, so it is called nanofiltration. Based on the superior characteristics of nanofiltration separation technology, it has shown broad application prospects in pharmaceutical, biochemical, food industry and many other fields.

4. Reverse Osmosis

Reverse osmosis is a membrane that uses the selective permeability of reverse osmosis membranes to only permeate solvents (usually water) while retaining ionic substances or small molecules. The static pressure on both sides of the membrane is used as the driving force to separate liquid mixtures. At present, reverse osmosis membranes have been widely used in many industries such as medicine, electronics, chemicals, food, and desalination. Reverse osmosis technology has become the preferred water treatment technology in modern industry.

Water plays an important role in our lives. It is the source of mankind and one of the most important material resources indispensable for human survival and development. Filtering is widely used in our daily life, and it is also an essential technology in our lives. The filtering technology will continue to be innovated and improved in the future.

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Allen Su - Hongtek Filtration Co.,Ltd.

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