ACTIVATED CARBON AIR TREATMENT – THE SCIENCE

activated carbon air filter

What is Activated Carbon?

Activated carbon (also referred to as an activated charcoal), is used in various forms for odour & Emission control.

Systems using carbon filtration media banks are used to control these emissions and other harmful airborne chemicals released from industrial processes. Activated carbon is highly effective at removing odours from a number of industrial processes when used correctly.

Activated Carbon Filtration System Designed To Your Needs

We can design and install a complete system to meet your specific requirements, following a detailed assessment. Read more about our range of Deep Bed Carbon filter systems here.

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How it works

activated charcoal filter

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”.

A carbon block filter 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 block is known as “dwell” or “contact” time. Typical dwell times range from 0.2 seconds to 10 seconds, depending on the application.

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.