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Active carbon has the dual characteristics of physical adsorption and chemical adsorption, and can selectively adsorb various substances in tap water to achieve decolorization, deodorization, and removal of chemical pollution and volatile organic compounds.
Types of activated carbon filters:
1-Powder-activated carbon filter
Powdered activated carbon is actually granular activated carbon with finer particle size. Due to its small particle size and large specific surface area, its adsorption effect is better than that of commonly used granular activated carbon.
2-Granular activated carbon filter
This is the activated carbon commonly used in water purifiers. The smaller the particles, the better the adsorption capacity, but the greater the resistance of the water (the pressure difference between the inlet and the outlet), the easier it is to leak carbon, so the water purifier manufacturer should choose the particles with the appropriate particle size. In large-scale water treatment equipment, 10-24 mesh (diameter 0.8-2.0mm) is often used. Small household water purifiers are recommended to use 16-32 mesh (diameter) due to the short carbon column height, fast flow rate, and short contact time between water and activated carbon. 0.6—1.3mm).
3-Activated carbon fiber felt
Different raw materials, there are two kinds of it: one is made of viscose fiber filament as raw material, processed into cloth, carbonized, activated, and processed at high temperature; Felt is made by pre-oxidation, carbonization, activation, and high-temperature treatment. The average aperture is 17-26A for the former and 10-20A for the latter.
Activated carbon fibers are often made of felts with a thickness of 1-5mm. It has more micropores than granular activated carbon, a larger specific surface area (1000-1600m2/g), a larger adsorption capacity (2-6 times higher), and a faster adsorption speed. It is fast, has good regeneration performance, has fast desorption speed, and can be reused.
4-Sintered activated carbon filter
Sintered activated carbon filter (CTO) is also known as a carbon rod filter or compressed activated carbon filter. It is formed by adding a binder (such as PE resin) with granular activated carbon and heating, sintering, and extrusion. The outer layer of the filter element is often covered with white polypropylene (PP) non-woven fabric. The sintered activated carbon filter has two functions of adsorption and filtration (average pore size 3-20um), but its filtering function is lower than that of PP melt-blown filter, and its adsorption function is lower than that of a granular activated carbon filter.