Granular Activated Carbon (GAC) – Chemical Additive For Adsorption Of Impurities In Water And Other Fluids

Granular Activated Carbon, also called Granular Activated Charcoal, is a form of carbon processed to have small, low volume pores that increase the surface area available for adsorption of impurities present in water or other fluids.

Due to its high level of porosity, one gram of Granular Activated Carbon (GAC) can be processed to attain surface area in excess of 1000 square meters.

A method of filtering that uses a bed of activated carbon to remove contaminants and impurities, is called carbon filtering

GAC can be produced from a wide range of carbonaceous materials including wood, coal, peat and coconut shell. However, GAC made from coconut shell are hard as compared to other carbons and have a higher surface area and thus give more adsorption.

Granular Activated Carbons find application in a wide range of industries:

  1. Drinking Water Purification
  2. Effluent Treatment Plants
  3. Waste Water Treatment
  4. Swimming Pools
  5. Purification of industrial gas
  6. Adsorption of dissolved organic matter
  7. Alcoholic beverage purification

GACs are usually graded on the basis of their adsorption capacity measured in terms of iodine value. Commercially, iodine values ranging from 450 to 1200 are more popular.

Granular Activated Carbon can also be impregnated with inorganic impregnates to impart special properties. For example, silver impregnated activated carbon is used for drinking water application due to its anti-bacterial properties.

ACURO’s RADOCARB range of Granular Activated Carbons and RADOSIL range of silver impregnated carbons are well accepted in the market for their excellent and consistent quality.


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