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Activated Carbon Adsorption Method
Date:2013-07-31

 Adsorption media:
Activated carbon, prepared by pyrolizing coconut shells, coal or resin beads removes chlorine by a catalytic mechanism and dissolved organics by adsorption and is often found at two locations in a water purification system. The carbon can be used as granules or more conveniently in block form. As thin-film composite reverse osmosis membranes could be damaged by excessive exposure to free chlorine, and, to a lesser degree, fouled by dissolved organics, activated carbon is often placed prior to the RO membrane to remove these contaminants.


Activated carbon filters are also often placed in the polishing loop of a water purification system to remove trace amounts of dissolved organics, prior to final ion exchange.


RephiLe’s cartridges filled with LeFil™ and OrganeFil™ media. Those media are composed of nuclear grade ion exchange resins and nuclear grade activated carbon to remove specific types of water contaminants.

 

 What are the benefits of Activated Carbon?
· Activated carbon (AC) = very small particulates with small pores inside à very important developed surface. 1,000 m² / gram
· Activated carbon in Lab Water applications :
    ▲Reduction of chlorine: as a protection for the RO membranes – Natural Activated carbon. 
    ▲Removal of organic substances by non specific binding

      

 natural activated carbon       artificial activated carbon


 What are the Limitations of Activated Carbon?
· Very little effect on other contaminants (except some particulates removed by depth filtration).  
· Once all active sites are occupied, an equilibrium is established and organics start leaching.
· Bacteria may develop after several months.
· Efficiency depending on flow rate

 

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