Activated Carbon Air Filter

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Activated carbon air filters, sometimes also referred to as activated charcoal filters, are used to combat nuisance odours, or volatile organic compounds (VOCs) and other harmful airborne chemicals released from industrial processes.

Part of the EXEON mission is to supply workplaces with clean air through the design, installation and servicing of activated carbon filter fan extract systems. Our expert advice, innovative design and practical solutions ensure you can benefit from an activated carbon air filter system that protects both your workforce and local environment.

We can design and install a complete activated carbon air filter system to meet your specific requirements. We can advise on the options following a detailed assessment.

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An introduction

Activated carbon has been used since the First World War to protect infantry against chemical gas attack.

The base material can be coal, wood or even peat, but the best quality carbon uses coconut shells. The material is chemically or thermally treated, usually with superheated steam, to expose the internal pore structure. This increases the surface area by over 100 times. A teaspoonful of carbon can have the surface area of a football pitch.

The vast surface area and tortuous route through the pore structure encourages molecular to surface collisions. “Van der Waal” forces cause molecules to attract and remain within the carbon structure, this is known as “adsorption”.

The carbon is typically in pellet or granular form in beds,
arranged so that air can pass through. The time the air is in
contact with the carbon is known as “dwell” or “contact”
time. Typical dwell times range from 0.1 seconds to 1
second or more in large “deep bed” adsorbers.

When the bed is “saturated” with contaminant, then
“breakthrough” is experienced, with emissions rising. This
means the bed is exhausted and no further adsorption can
take place.

Technical Design Service

We have facilities for full CAD design of systems on a site-by-site basis and can provide both 3D visuals and
detailed working drawings. We can also carry out dispersion modelling and odour
testing.