Granular activated carbon (GAC) into particles shaped and unshaped. Mainly in coconut shells, husks and coal as raw material, and is formed by series production finishing. Products are widely used in drinking water, industrial water, wine, waste processing, bleaching, drying, gas cleaning and so on. Granular activated carbon made of high quality anthracite as raw materials, refined processing by using advanced technology, appearance of black amorphous granules have developed pore structure, good adsorption performance, high mechanical strength, easily regenerated, low cost used for purification of toxic gases, waste processing, industrial and domestic water purification, solvent recovery, and so on.
Granular activated carbon (GAC) has a relatively larger particle size compared to powdered activated carbon and consequently, presents a smaller external surface. Diffusion of the adsorbate is thus an important factor. These carbons are suitable for adsorption of gases and vapors, because gaseous substances diffuse rapidly. Granulated carbons are used for air filtration and water treatment, as well as for general deodorization and separation of components in flow systems and in rapid mix basins.Granular activated carbon can be obtained in either granular or extruded form.Granular activated carbon is designated by sizes such as 8×20, 20×40, or 8×30 for liquid phase applications and 4×6, 4×8 or 4×10 for vapor phase applications. A 20×40 carbon is made of particles that will pass through a U.S. Standard Mesh Size No. 20 sieve (0.84 mm) (generally specified as 85% passing) but be retained on a U.S. Standard Mesh Size No. 40 sieve (0.42 mm) (generally specified as 95% retained). AWWA (1992) B604 uses the 50-mesh sieve (0.297 mm) as the minimum GAC size. The most popular aqueous-phase carbons are the 12×40 and 8×30 sizes because they have a good balance of size, surface area, and head loss characteristics.