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The function and working principle of activated carbon filter
- May 03, 2018 -

In some water treatment systems, filter devices are often applied. The activated carbon filter is one of the more widely used filtration equipment. Especially in the water quality pretreatment system, the activated carbon filter can adsorb residual chlorine that cannot be removed in the pre-stage filtration to prevent oxidation degradation of the post-stage reverse osmosis membrane, and also adsorbs contaminants such as small-molecule organics leaked from the preceding stage. .


Because of these characteristics, the active carbon filter can effectively remove offensive odors, colloids, and pigments, heavy metal ions, and the like, and also have a function of reducing COD. In practical applications, the device can further reduce the SDI value of the RO inlet water to ensure SDI<5, TOC<2.Oppm. So, what is the working principle of this device?


In fact, the filtration effect of the activated carbon filter is mainly based on the carbon bed to achieve the purpose of filtration and removal. We know that the activated carbon particles that make up the carbon bed have a lot of micropores and a large specific surface area and have a strong physical adsorption capacity. Water passes through the carbon bed and the organic pollutants in the water are effectively adsorbed by the activated carbon. In addition, there are some oxygen-containing functional groups on the non-crystalline part of the activated carbon surface, so that the organic pollutants in the water passing through the carbon bed are effectively adsorbed by the activated carbon.


Through the above introduction, we can understand that the activated carbon filter can be regarded as a relatively common water treatment equipment. As a water treatment desalination system pre-treatment can effectively guarantee the service life of the rear-end equipment, improve the quality of effluent, prevent pollution, especially prevent the free oxygen poisoning pollution of the reverse osmosis membrane, ion exchange resin and other free state.


It should be noted that during the operation process, the adsorption effect and service life of the activated carbon filter are mainly affected by such factors as the type and concentration of the contaminant, the residence time of the air flow in the filter material, and the temperature and humidity of the air. Therefore, when selecting an activated carbon filter, it is necessary to consider conditions such as the types of pollutants, concentration, and air volume.