When a substance is attached to a surface is is called adsorption, is this case the substance is attached to the internal surface of active carbon. When a substance is absorbed in a different medium it is called absorption. ... Figure 1 gives a specific adsorption isotherm for active carbon.

What is GAC adsorption?

Adsorption is the primary mechanism by which GAC works and the primary reason it is widely used to reduce undesirable taste, odor and color and to improve the safety of drinking water by also effectively removing common disinfection byproducts (THMs), organic contaminants like chlorinated solvents and other industrial ...

How does GAC filtration work?

A filter with granular activated carbon (GAC) is a proven option to remove certain chemicals, particularly organic chemicals, from water. ... The activated carbon removes certain chemicals that are dissolved in water passing through a filter containing GAC by trapping (adsorbing) the chemical in the GAC.