Activated carbon material is the amorphous carbon obtained by processing. It has a large specific surface area, and has good adsorption ability to inorganic or organic substances and colloidal particles in gas and solution. Activated carbon materials mainly include activated carbon (Activated, Carbon, A, C) and activated carbon fiber (Activated, Carbon, Fibers, ACF) and so on. Activated carbon, as an excellent adsorbent, is mainly determined by its unique adsorption, surface structure and surface chemical properties. The chemical properties of the activated carbon is stable, high mechanical strength, heat resistance, acid and alkali, insoluble in water and organic solvent, can be used for regeneration, has been widely used in various chemical, food processing, environmental protection, metallurgy, medicine, military and other fields of refined chemical protection. At present, modified activated carbon materials are widely used in wastewater treatment, air pollution control and other fields, and in the treatment of environmental pollution has increasingly shown its attractive bright future.
More than 80%-90% of activated carbon is composed of carbon elements, which is also the reason why activated carbon is hydrophobic adsorbent. In addition to carbon, it also contains two kinds of admixtures: one is the combination of chemical elements, mainly hydrogen and oxygen, these elements are due to incomplete carbonization and the residue in the carbon, or in the process of activation, non carbon and activated carbon surface chemical foreign combination, such as water vapor activation and the surface of activated carbon is oxidized or water vapor oxidation; another kind of admixture is ash, it is the inorganic part of activated carbon.
The main raw material of activated carbon can be almost all organic materials rich in carbon, such as coal, wood, shell, coconut shell, walnut shell, apricot shell, jujube shell, etc.. These carbonaceous materials are converted into activated carbon by pyrolysis in activated furnaces at high temperatures and under certain pressures. In the activation process, large surface area and pore structure of the complex formed gradually, and the adsorption process is conducted on the surface in the pore, the pore size of the activated carbon has the role of selective adsorption to the adsorbate, this is due to the large molecules cannot enter than activated carbon pore small pores within it for the sake of. Activated carbon is a hydrophobic adsorbent made from carbon containing material as raw material and carbonized and activated at high temperature. Contains a lot of microporous activated carbon, has a huge surface area, can effectively remove the color, smell, can remove most of the organic pollutants in water two and some inorganic substances, including some toxic heavy metals.
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The work of the activated carbon filter is done through a carbon bed. Components Carbon bed Activated carbon particles have many micropores and huge specific surface area, with strong physical adsorption capacity. Water through the carbon bed, the water in the organic pollutants through the activated carbon adsorption effective. In addition, the noncrystalline part of the activated carbon surface has some oxygen functional groups, which are effective in the adsorption of organic pollutants through the activated carbon through the carbon bed.
Activated carbon filter is a more commonly used water treatment equipment for the water treatment desalination system can effectively ensure that the latter pretreatment stage equipment life, improve water quality, prevent pollution, especially to prevent reverse osmosis membrane, ion exchange resin More than free oxygen poisoning. The main factors that affect the adsorption and service life of carbon filtration are the type and concentration of pollutants, the retention time of air filter material, the temperature and humidity of air.
The actual choice is based on the type of pollutants, concentration and treatment, such as air conditions, to determine the filter form and the type of activated carbon. Activated carbon filters and downstream should have a good dust filter, the efficiency of the specification shall not be lower than F7. The upstream filter prevents dust from clogging the activated carbon material; the downstream filter stops the activated carbon itself from dusting.
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