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What Kind of Activated Carbon Filter Should You Select?

Apr. 29, 2022


Activated carbon is a kind of microcrystalline carbon material made of carbonaceous material with black appearance, well-developed pore structure, large specific surface area and strong adsorption capacity. It is a commonly used adsorbent, catalyst or catalyst carrier. Good activated carbon must have the characteristics of large adsorption capacity, long service life, high mechanical strength, low ash content, easy washing and good effluent quality. It can not only remove peculiar smell, odor and improve chroma, but also has a high level removal rate of pollutants such as chlorine, phenol, mercury, lead, arsenic, chloride, detergent, pesticide, fertilizer and other pollutants in water.

Activated carbon has a negative electric charge which attracts the molecules of many contaminants. While some chemicals like sodium and nitrates pass right through an activated water filter, organic and carbon-based impurities are efficiently bound to the surface. Let see what kinds of carbon filter could we choose for water filtration.

1. UDF Granular Activated Carbon Filter

Granular Activated Carbon Filter is made of nut shell activated carbon or medium activated carbon, and some also use coconut shell. It has a lot of micropores and specific surface area, so it has a strong adsorption capacity, which can effectively adsorb organic pollutants, chemical pesticides, residual chlorine, different colors and odors in water. 

Activated carbon particle is filled in plastic filter housing without any chemical additives. There are multiple layers of microfiber non-woven fabrics at the upper entrances and lower exists of the shell to prevent the release of carbon powder. The shell is produced by ultrasonic welding process of ABS material. Since the liquid flows from the bottom to the top, ensuring long time and wide area of contact between liquid and activated carbon particle layer. Usually use period is about 3~6 months.


2. CTO Extruded Carbon Block Cartridge Filters

CTO is named after the shape, and its processing has several molding modes: sintering, compression and extrusion. Coal-based or coconut-based carbon with an iodine contents of more than 900 is used as a filter material, and is sintered and compressed with a food-grade binder. CTO Carbon Filter is used in water treatment equipment to remove residual chlorine, chemical pesticides, different colors, odors, and filter fine impurities. It is used in the third stage in the pure water machine to protect the RO membrane, and the service life is about 3~6 months.


3. Carbon Impregnated Cellulose Filter Cartridges 

Carbon impregnated cellulose filter not only have the inherent essential characteristics of carbon materials, but also have the soft processability of textile fibers, which is a new generation of adsorption materials. More than 80% of the carbon atoms of the Carbon Impregnated Cellulose Filters are located on the inner and outer surface, forming a unique adsorption structure, which is called surface solid. Combined with the dual-function of activated carbon adsorption, the outer layer of the filter element is lined with precision fiber filter material, and then surrounded by activated carbon fiber cloth. As the liquid flows through the filter material, the outer layer of the deep fiber filter material structure can block the pollutant particles.

Carbon impregnated cellulose filter are widely used in water purification, color removal, odor removal, organic removal, air purification devices, ozone filters, nuclear pollution air purification devices, gasoline traps and other industries.


4. Activated Carbon Pleated Filter Cartridges

Activated carbon pleated filter is composed of a high quality activated carbon fibers, activated carbon impregnated fibers, and some use fiber paper. It is a deep filtration with large flux and has heat resistance, acid and alkali resistance. It has a strong adsorption capacity for chlorine, organic matter, odor, etc. And no harmful substances are precipitated.

Activated carbon pleated filter solve the problem of carbon rod leakage and fracture during transportation and filtration. Combining the blocking effect of fiber and the adsorption effect of activated carbon, it can effectively remove particles, oil stains, pigments, gas molecules, etc.


5. Composite Activated Carbon Filter

Some activated carbon filter add a certain amount of PP melt blown fiber in the design process, so that it not only has the function of activated carbon, but also has the advantage of sediment filter. This filter is called activated carbon and PP composite filter, or referred to as composite activated carbon filter. It can not only retain large particles such as yellow sand, rust, and small insects, but also remove residual chlorine, pigments and odors well.

The main technical indicators are as follow:

Granularity (10~24 mesh, 2~0.8mm)≥95% 
Note: The smaller the particle size of activated carbon, the larger the specific surface area, that is, the better the adsorption effect 
Iodine adsorption value≥1000mg/g
Note: The higher the iodine adsorption value, the stronger the adsorption capacity of activated carbon
Decolorization power≥10mL/g
Note: The stronger the decolorization ability, the better the activated carbon performance
Wear resistance≥95%
Note: That is, resistance to wear or friction, the higher the strength, the better the activated carbon performance
Loss on drying≤10%
Note: drying loss refers to moisture, the lower the value, the better the quality of activated carbon
Burning residue≤3%
Note: Burning residue refers to ash, the lower the value, the better the quality of activated carbon
Filling specific gravity0.48-0.55g/mL
Note: The filling specific gravity refers to the density, the smaller the density, the better the adsorption capacity of activated carbon
PH value6~8

Application areas of activated carbon filter:

I. Electronics and Power Industry: pure water, gas, electrolytic fluid, printing line plate, etc.

II. Chemical and Petrochemical: solvents, coatings, magnetic paste, detergents, liquid waxes, etc.

III. Pharmaceutical Industry: hospital water, pharmaceutical injections, oral liquids, etc.

IV. Food Industry: food, beverage, drinking water, alcohol, etc.

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