Overview is expressed as back washed and
Overview BriefOverview Activatedcarbon, also called activated charcoal, activated coal, or carbo activatus, isa form of carbon processed to be riddled with small, low-volume pores thatincrease the surface area available for adsorption or chemical reactions. Theincreased surface area of activated carbon makes the material suitable foradsorption, a process by which impurities in substances such as fluids, vaporsor gas are removed. Impure molecules are held within the carbon’s internal porestructure by electrostatic attraction or chemisorption. The adsorption processhelps carbon reduce dangerous matter, activate chemical reactions, and act as acarrier of biomass and chemicals.
Activated carbon products can be characterized by physical properties andactivity properties. Both physical and activity properties become importantfactors 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, carbondensity is expressed as back washed and drained (BWD) or bulk density.
Thisestablishes the number of pounds of carbon required to fill a back washablefilter, and is expressed in terms of pounds per cubic foot. Applications GasPurificationGranularactivated carbon has a wide range of uses in both gas and exhaust air treatmentapplications. As a carrier medium for special impregnating agents or catalysts,Activated carbon is useful in the recovery of solvents, in the purification ofprocess gases, in the removal of dioxins, heavy metals, organic impurities. Toremove pollutants in Air conditioner and exhaust system and to remove odoroussubstances in kitchen exhaust food and refrigerator filters.
EnvironmentalusageActivatedcarbon is used in waste water treatment for air purification, reduction in thelevel of Biological oxygen demand (BOD) and Chemical oxygen demand (COD).Having a safe BOD level in wastewater is essential in producing qualityeffluent. If the BOD level is too high, then the water could be at risk forfurther contamination, interfering with the treatment process and affecting theend product.COD is an application that is usually used in industrial settings;however, municipalities treating wastewater with chemical pollutants may use itas well.