Coal Granular Activated Carbon

Coal granular activated carbon is an inert solid adsorption material, which is usually used to remove various pollutants dissolved in water and treat industrial waste gas. It is made from almost any carbonaceous feedstock, including coconut shells and coal feedstocks.

Adsorption is the accumulation of a gas or liquid on the surface of another liquid or solid substrate. It is the opposite of absorption, where foreign substances enter the body of the substrate.

Coal-based granular activated carbon is porous, low-cost, and as a sorbent, it is plug-and-play and can provide a surface area large enough to remove contaminants. Compared with any other material used for physical adsorption, coal-based granular activated carbon has a larger effective specific surface area per unit. In fact, a teaspoon of activated charcoal has more surface area than an American football field.

For industrial pollution with higher likelihood and frequency, more activated carbon needs to be prepared to deal with possible emergencies. Granular or extra large carbon granular activated carbon is used to control volatile pollutant gases such as hydrogen sulfide and other gases in municipal sewage. Granular activated carbon also reduces the variability of the filter bed, and purification is achieved by passing the exhaust gas flow through the carbon bed, which also reduces potential energy consumption such as fans that pass the exhaust gas through the dense filter bed.

Using conventional coal-based granular activated carbon, mobile hydrogen sulfide can also be oxidized to immobile elemental sulfur, which will accumulate on the carbon surface. At present, some people have studied the use of the generated sulfur element as an indicator of whether the activated carbon filter bed needs to be replaced. Furthermore, coal-based granular activated carbon can be used as a catalyst to catalyze hydrogen peroxide, which can effectively remove organic impurities in waste sulfuric acid, and the recovered sulfuric acid can be reused directly or after concentration.