Biological Processes are used to remove undesirable components from industrial waste gases by means of micro-organisms. Waste gases are forced through layers of high quality filter material on which micro-organisms have been deposited.
After absorption in the filter material, the micro-organisms beak down the polluting components and transform them into harmless products such as cabron dioxide, water and mineral salts.
Biological processes are increasingly being applied in the purification of waste gases because they generally have the advantage that pollutants are not transferred to another phase and therefore, new environmental problems are not created, or where they are created are usually minimal.
Moreover, the processes are cheap and reliable and do not usually require complex process facilities.
The three primary types of biological processes are: