An important part of flue gas purification is the removal of particulates from the exhaust gas. These dusts are partly produced during the incineration process, but also by the individual components of the flue gas cleaning process - such as the spray absorber, by spraying activated carbon and lime milk.

Different methods are available for this, such as filtration of particles through porous materials or separation by means of centrifugal force. Another option is to charge the dust particles electrostatically, which can also be combined with wet cleaning.

A number of system components can be made use of for the solids separation process. To a certain degree, they are also effective when used for the separation of gaseous pollutants.