Granular Activated Carbon vs Powdered Activated Carbon
While both Granular Activated Carbon and Powdered Activated Carbon are equally important, choosing the right particle size depends on various factors.
- Equipment / Reactors
Application & Efficiency
For example when it comes to application : GAC is more widely used in Water filtration and PAC is used in food decolorisation . PAC having a high surface area due to natural laws of chemistry : and most PAC being manufactured from wood make it excellent to adsorb the large molecular size of color on food / pharmaceuticals and bulk drugs. On the other GAC is good in water filtration as most GAC is made from Coconut / Coal. Both having good hardness : GAC does not crumble or break under high pressure and flow rate. It also has the ability of being regenerated and used severals times vs PAC. Regeneration of PAC is a challenge.
Disposal & Regeneration
Most GAC can be used several times before regeneration. On the other hand Powdered Activated Carbon ( while there is a possibility of regeneration), regeneration is a challenging operation and normally a high disposal cost is paid
Equipment and Handling
Based on what kind of equipment and handling is required or permitted in the plant : we can choose type of carbon to be used. If filter presses are used and are able to squeeze out the filtrate from the powdered carbon : PAC is preferred else tall reactors to accommodate GAC would be used to avoid Cake formation and high filtration pressure. PAC also has the risk of dusting during operations : hence de-dusting equipment / dust collectors are required to carry operations with PAC.