Coal based activated carbonIt is developed through a series of processes including carbonization, cooling, activation, and washing. Its appearance is generally black roundcolumnar activated carbonAmorphous coal particlesactivated carbonAlso known as broken charcoal. Cylindrical activated carbon, also known as columnar carbon, is generally made by mixing and extruding powdered raw materials and binders, followed by carbonization, activation and other processes. It can also be usedpowdered activated carbonSqueeze molding with adhesive. It has developed pore structure, good adsorption performance, high mechanical strength, easy to regenerate repeatedly, and low cost; Used for the purification of toxic gases, exhaust gas treatment, purification of industrial and domestic water, solvent recovery, and other aspects.

Coal based granular activated carbon has high strength, well-developed pores, large specific surface area, and especially unique advantages due to its large micropore volume. Coal based activated carbon has strong adsorption capacity for organic matter, free chlorine in various types of water, and harmful gases in the air. It is an excellent adsorbent for deep purification of urban drinking water and is used to remove bacteria and toxic gases from the air. Coal based activated carbon has a developed pore structure, good chemical stability, and mechanical strength, making it an excellent broad-spectrum carbonaceous adsorbent material. According to their different appearances, coal based activated carbon can be mainly divided into coal based granular activated carbon and coal based powdered activated carbon. Granular activated carbon is further divided into coal based formed carbon [including columnar carbon, pressed block carbon (or compressed sheet carbon), spherical carbon, and raw coal crushing activated carbon]. Depending on their uses, activated carbon can be divided into various applications such as water purification, air purification, decolorization, solvent recovery, injection, and protection. Due to its acid, alkali, and heat resistance, and the fact that granular activated carbon can be easily regenerated after adsorption saturation, activated carbon is an essential carbonaceous adsorbent material in modern industrial production and environmental protection.

The adsorption of solute molecules in water by coal particle activated carbon is a complex process, which is the result of the combined action of several forces, including ion attraction, van der Waals force, chemical impurities, and forces. According to the dual rate diffusion theory of adsorption, adsorption is a dual rate process consisting of two stages: rapid diffusion and slow diffusion. Rapid diffusion is completed within a few hours, utilizing 60% to 80% of the adsorption capacity of coal based granular activated carbon. Rapid diffusion is the process in which solute molecules diffuse uniformly along the radial direction in large pores with low resistance within carbon particles. These large pores generate radial diffusion resistance. When molecules diffuse further from the macropores into the micropores connected to the macropores, they experience significant resistance due to the narrow pore size, resulting in extremely slow diffusion. Micro pores are also uniformly distributed within carbon particles, but do not constitute radial diffusion resistance. The factors affecting the adsorption of coal particle activated carbon involve solute molecular polarity, molecular weight size, and spatial structure, which depend on the characteristics of the water source quality. Coal particle activated carbon has selective adsorption properties for different substance molecules.

Advantages

1) The main characteristics of the application of coal based granular activated carbon are low equipment investment, low price, fast adsorption speed, and strong adaptability to short-term and sudden water pollution.

2) Adding coal based granular activated carbon has a significant effect on removing chromaticity. It has been reported that the removal of chromaticity can reach up to 70%. Low chromaticity indicates high efficiency in removing organic matter, and good results in removing iron and manganese.

3) Adding coal based granular activated carbon has a significant effect on removing odors.

4) Adding coal based granular activated carbon helps to remove anionic detergents.

5) Adding coal based granular activated carbon helps to remove algae. The addition of coal particle activated carbon blocks the light absorption of algae and has a significant coagulation effect in sources with low turbidity, which helps to remove algae in coagulation sedimentation.

6) The addition of coal based granular activated carbon significantly reduces chemical oxygen demand and five-day biochemical oxygen demand, which are positively correlated with the degree of organic pollution in water bodies. The decrease in these characteristic indicators indicates the degree of removal of toxic and harmful substances in water bodies.

7) Adding coal based granular activated carbon has a good effect on the removal of phenols.

8) Adding coal based granular activated carbon powder significantly reduces the turbidity of the effluent and improves the quality of tap water.

9) The effect of adding coal based granular activated carbon on the mutagenicity of water can effectively remove organic pollutants. It is a simple way to improve the quality of drinking water through conventional processes.

After adding powdered activated carbon, a considerable amount of organic matter in the water is removed, the content of gelatinous substances in the water decreases, and the surface viscosity decreases. Adsorption of powdered activated carbon on flocs facilitates bridging of flocs and improves their structure. Therefore, for water bodies with low turbidity and severe pollution, adding coal particle activated carbon not only has a good ability to remove organic pollution, but also has a good coagulation effect, greatly improving the effluent quality. It is a relatively small investment and fast return, especially for large-scale old water plants, and is a reliable purification process for treating polluted water sources.

Coal particle activated carbon is made from high-quality smokeless coal as raw material, refined and processed using advanced technology, and has a black particle appearance; It has the characteristics of reasonable pore structure, good adsorption performance, high mechanical strength, easy to regenerate repeatedly, and low cost. Coal based granular activated carbon is mainly used for the purification of toxic gases, exhaust gas treatment, industrial and domestic water purification. It is suitable for the purification of raw water and tap water in power plants, especially in the filtration and purification of chemical wastewater and the treatment of chloride ions in bitter and salty water used in power plant boilers. It has good treatment effects.

The main performance of coal particle activated carbon is adsorption, which is related to the pore structure of activated carbon. The specific surface area and specific volume of micropores are both very large. Therefore, micropores largely determine the adsorption capacity of activated carbon. On the surface of solid activated carbon, there are mainly two types of adsorption, namely physical adsorption and chemical adsorption. Chemical adsorption is a single molecular layer adsorption that can remove polar pollutants and some metal ions from wastewater and exhaust gas. Physical adsorption can form multi molecular layer adsorption, which can effectively adsorb organic pollutants in wastewater and exhaust gas. When a certain adsorbate comes into contact with the surface of the adsorbent, whether physical adsorption or chemical adsorption occurs depends on the surface activity of the adsorbent, the properties of the adsorbate, temperature, and other factors. In addition to adsorption capacity, industrial activated carbon also requires: ① high mechanical strength and good wear resistance; ② Low energy required for detachment and easy regeneration; ③ Stable structure, minimal carbon loss during regeneration, etc