Activated carbon plays a significant role in the deep purification of municipal drinking water, and is effective in removing a large number of water-soluble organic pollutants (DOC), odour and ammonia nitrogen. Activated carbon adsorption method to remove pollutants in water. Generally, choose coal granular activated carbon. We can judge the quality of activated carbon according to iodine value, methylene blue value, but coal activated carbon according to the production process is not necessary, can be divided into agglomerated and directly crushed granular activated carbon.
The following is the difference between the two:
Compared with columnar activated carbon, tar is not used as binder in the production process, and it is directly pressed by coal blending and milling, and then crushed and divided into different particle sizes according to the needs after carbonisation and activation. Since no tar is used in the production process of briquetted granular activated carbon, it is less polluting. Raw coal crushed granular activated carbon is made by directly charring and activating raw coal and then crushing it into different sizes according to the demand.
The surface of coal-based activated carbon made by re-agglomerated method is rougher than the rounded surface of raw coal directly crushed carbon, and microorganisms are easier to attach and produce on its surface. As shown in the following picture, the scanning electron microscope shows the surface morphology of briquette crushed granular activated carbon and raw coal direct crushed carbon into biofilm under the condition of applying ozone-bioactivated carbon process, respectively. The surface of the briquette crushed granular carbon is very rough under magnified conditions and there are colonies formed, like a porous sponge, while the raw coal directly crushed carbon can be seen that the surface is relatively smooth, unlike the briquette crushed granular carbon where there are a large number of colonies formed on the surface.
Activated carbon pore volume and pore structure distribution uniformity determines the regulation to the microbial food supply capacity, through the coal method for the briquette crushing activated carbon pore volume and pore size distribution regulation than the original coal crushing granular activated carbon is stronger.
The floatation rate of coal-based activated carbon produced by the briquetting method is much lower than that of directly crushed activated carbon from raw coal. In liquid phase adsorption applications (e.g., water treatment), activated carbon with a high floatation rate tends to collect on the liquid surface rather than being evenly distributed in the water column. This reduces the contact area of the activated carbon with the pollutant and affects the adsorption effect.
The stack density of briquette crushed granular activated carbon is higher than that of raw coal directly crushed activated carbon, and the stack density of activated carbon will affect the backwash efficiency, thermal regeneration efficiency and the amount of product put into the filter at one time. Because the input of activated carbon into the filter is measured by volume, while sales and purchases are calculated by mass, i.e. a higher density means a more activated carbon product per unit volume. Higher density activated carbon can withstand faster backwash water flow rates and has better performance recovery during regeneration.
Briquetted granular activated carbon is stronger than raw coal direct crushed activated carbon, and activated carbon with high hardness and abrasion strength has lower losses during transport, conveying, backwashing and regeneration. If a high temperature thermal regeneration process is used, the strength is very important for the reproduction rate, which saves costs.
To sum up, the performance of briquette crushed granular activated carbon in municipal drinking water application is much higher than that of raw coal direct crushing activated carbon, although the price is higher than that of raw coal direct crushing activated carbon, but in terms of the service life and purification effect, its cost-effectiveness is still higher than that of raw coal direct crushing activated carbon.
Huamei Activated Carbon is one of the top 10 activated carbon manufacturers in China, with rich experience in activated carbon production and extensive product application knowledge, we provide professional purchasing advice and services for activated carbon buyers all over the world, if you have any questions about activated carbon, please contact us.
