Activated carbon, also called activated charcoal, is a form of carbon processed to have small, low-volume pores that increase the surface area available for adsorption or chemical reactions. Those derived from coal and coke are referred as activated coal and activated coke respectively. Activated Carbon works via a process called adsorption, whereby pollutant molecules in the fluid to be treated are trapped inside the pore structure of the Carbon substrate.
Carbon filtering is commonly used for water purification, in air purifiers and industrial gas processing, for example the removal of Siloxanes and Hydrogen Sulfide from Biogas. It is also used in a number of other applications, including respirator masks, the purification of sugarcane and in the recovery of precious metals, especially gold. It is also used in cigarette filters.
Active Charcoal Carbon filters are most effective at removing Chlorine, sediment, volatile organic compounds (VOCs), taste and odor from water. They are not effective at removing minerals, salts, and dissolved inorganic compounds. Typical particle sizes that can be removed by carbon filters range from 0.5 to 50 micrometres. The particle size will be used as part of the filter description. The efficacy of a Carbon filter is also based upon the flow rate regulation. When the water is allowed to flow through the filter at a slower rate, the contaminants are exposed to the filter media for a longer amount of time. Green Water Concepts is one of the largest suppliers of activated carbon of different grades across Kerala.