Introduction Of Microfiltration

     The microfiltration begins from mid-19th century，and in 20th century this technology has been made large scale research，then it has rapid development in  20th century 60s。

     Microfiltration filter has three theories: screening, cake filtration, deep bed filtration. MF is generally believed that the separation mechanism is the screening mechanism, the physical structure of membranes play a decisive role. In addition, factors such as adsorption and electrical properties also have an impact on the rejection rate. The effective separation range is 0.1-10μm, operating static pressure difference is 0.01-0.2MPa.

     Microfiltration can retain micron particles between 0.1 to 1um, micro-filtration membrane allows molecules of organic substances and dissolved solids (salts), etc. but it can stop the suspended solids, bacteria, some viruses and large-scale colloid , micro-membrane pressure difference on both sides of the running (effective driving force) is generally 0.7bar.

    Followed is the membrane material:

    1) The sintered metal porous membrane (such as stainless steel);

    2) inorganic porous membrane (such as alumina, glass, silica, etc.);

    3) The organic polymer microporous membrane (such as polyethylene, polysulfone, polyamide, cellulose acetate, etc.).

     Now the mainly product of the microfiltration is membrane filter and syringe filter, both of them can be used in laboratory for microfiltration。The microfiltration is used to retent micron and submicron small suspended solids, microorganisms, particulates, bacteria, yeast, red blood cells, contamination, etc from the gas and liquid retention, to achieve the purpose of separation, purification and enrichment 。