Factors Affecting the filtration Effect of Coal-based Activated Carbon
Although coal-based activated carbon has a good effect of filtering impurities in water. However, in the actual use of coal-based activated carbon, the filtering effect of coal-based activated carbon will be affected in many ways.
For example, the particle size of the filter material, the acidity and alkalinity of the water quality, and the water temperature and other factors. This will affect the filtering effect of coal-based activated carbon.
The particle size of filter material
The coal-based activated carbon filter material used for water treatment shall have three requirements: large adsorption capacity, fast adsorption speed, and good mechanical strength. In addition to other internal conditions, the adsorption capacity of carbon is mainly related to the specific surface of the carbon. The adsorption rate is mainly related to particle size and pore distribution. The transition pore (radius 20-1000a) of carbon for water treatment is relatively developed, which is conducive to the transition of adsorbate (water pollutant) to micro. The smaller the particle size, the faster the adsorption speed, but the greater the head loss, generally 8-30 mesh is appropriate.
Acidity and alkalinity of water
When the water is acidic, the adsorption capacity of coal-based activated carbon to anionic substances is relatively weakened. When the water quality is alkaline, the adsorption capacity of coal-activated carbon to cationic substances is weakened. Therefore, the unstable ph value of water quality will also affect the adsorption capacity of coal-based activated carbon.
Water temperature factor
The adsorption capacity of coal-based activated carbon filter material is related to water temperature and water quality. The higher the water temperature, the stronger the adsorption capacity of coal-based activated carbon. When the water temperature reaches 30 ℃, the higher the adsorption capacity, the lower the adsorption capacity. 当When the water quality is acidic, the adsorption capacity of activated carbon for anionic substances is relatively weak. When the water quality is alkaline, the adsorption capacity of coal-activated carbon for cationic substances is weakened. Therefore, the instability of water quality HM will also affect the adsorption capacity of coal-based activated carbon.
Usage time
Generally speaking, we need to clean the coal-activated carbon filter material once. Clean water is pure water because tap water contains calcium, magnesium, and other substances, which will be charged by carbon. If running water is used, clean it and clean the toner on the surface. Don’t wash it too long to avoid absorbing too much calcium and magnesium in water. Because coal-based activated carbon absorbs too many impurities and loses its function, it is replaced about once a month. There is one way to make the ineffective carbon recovery effect, that is, boil it in water to make it absorb again, but it should not be reused. It is recommended to replace the coal-activated carbon filter material at least once every two months.
Although coal-based activated carbon has been widely used in the field of water treatment, it has to be said that coal-based activated carbon filter material still has many defects and deficiencies in performance. Sometimes, in water treatment, it is often impossible to achieve the desired filtering effect by using only one filter material. Therefore, it is necessary to use multiple water treatment filter materials at the same time if the water quality is relatively high.