4 typical questions about VOCs
What are VOCs?
The abbreviation VOCs stands for ‘Volatile Organic Compounds’. They are organic chemicals with a high vapour pressure at room temperature. An easier statement to comprehend: these components have a low boiling point which means that they evaporate quickly.
An example is acetone, sometimes used in nail polish remover. This component boils at a much lower temperature than water. It is very volatile and quickly goes to the air. That is one of the reasons why you smell it so quickly even if you open the bottle only for a few seconds.
Where do VOCs come from?
Some VOCs are biologically generated as they are emitted by plants and animals. These molecules can help to attract insects to pollinate or even work as defensive mechanism. An example of a biogenic VOC is alpha-pinene. This gives your Christmas tree its distinctive smell.
Other VOCs are man-made, also known as anthropogenic VOCs. Major sources are the production and use of fossil fuels, such as mineral oil. Some VOCs are also widely used in industry as solvent in coatings and chemical processes.
What is the environmental impact of VOCs?
There are thousands of different VOCs, each with their own properties and impact on the environment as a result. Some improve pollination by insects while others contribute to the formation of smog and ozone.
Also, health effects vary widely from no health effects at all, to irritation to the airways, but some molecules impact human health quite severely while others enhance global warming or depletion of the ozone layer.
How can VOCs be removed?
VOC concentrations tend to be much higher indoors. Regularly opening a window at home can help you to improve your indoor air quality.
For industry, the answer to this question is of course very different! They are often legally obliged to treat or limit their VOC emissions. A lot of different technologies are available to do this. Some examples are scrubbers, biofilters, thermal oxidisers and activated carbon adsorption - DESOTEC’s expertise. We are always available to answer all your questions!
At DESOTEC’s facilities, all used carbon is analysed so the right measures can be taken for handling and removing the saturated carbon out of the mobile filters. Used carbon which meets DESOTEC's acception criteria can be reactivated.
This means that all molecules that were adsorbed on the activated carbon at the customers’ site are desorbed inside DESOTEC’s reactivation furnaces. These contaminants are then fully destroyed, in accordance with National and European legislation, by an incineration and neutralisation setup. The entire installation and its emissions are under continuous online monitoring, which guarantees that only harmless water vapour is seen exiting the chimney.
In case the saturated carbon does not meet our acceptation criteria, it is being sent for specialized external disposal.