Overview is expressed as back washed and

Overview

 

Brief
Overview

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Activated
carbon, also called activated charcoal, activated coal, or carbo activatus, is
a form of carbon processed to be riddled with small, low-volume pores that
increase the surface area available for adsorption or chemical reactions. The
increased surface area of activated carbon makes the material suitable for
adsorption, a process by which impurities in substances such as fluids, vapors
or gas are removed. Impure molecules are held within the carbon’s internal pore
structure by electrostatic attraction or chemisorption. The adsorption process
helps carbon reduce dangerous matter, activate chemical reactions, and act as a
carrier of biomass and chemicals.

 

Activated carbon products can be characterized by physical properties and
activity properties. Both physical and activity properties become important
factors in the specification of commercial carbons for POU applications.
Important physical properties are surface area, product density; mesh size,
abrasion resistance and ash content. In water treatment applications, carbon
density is expressed as back washed and drained (BWD) or bulk density. This
establishes the number of pounds of carbon required to fill a back washable
filter, and is expressed in terms of pounds per cubic foot.

 

 

 

 

 

Applications

 

Gas
Purification

Granular
activated carbon has a wide range of uses in both gas and exhaust air treatment
applications. As a carrier medium for special impregnating agents or catalysts,
Activated carbon is useful in the recovery of solvents, in the purification of
process gases, in the removal of dioxins, heavy metals, organic impurities. To
remove pollutants in Air conditioner and exhaust system and to remove odorous
substances in kitchen exhaust food and refrigerator filters.

 

Environmental
usage

Activated
carbon is used in waste water treatment for air purification, reduction in the
level of Biological oxygen demand (BOD) and Chemical oxygen demand (COD).
Having a safe BOD level in wastewater is essential in producing quality
effluent. If the BOD level is too high, then the water could be at risk for
further contamination, interfering with the treatment process and affecting the
end product.COD is an application that is usually used in industrial settings;
however, municipalities treating wastewater with chemical pollutants may use it
as well.