Process for processing flue gas which is produced during the combustion of carbon-containing fuels, in which at least one reactive oxygen species is generated electrochemically and in which the flue gas is treated with the reactive oxygen species, characterized by the following process steps: generation of flue gas by burning a carbon-containing fuel; - Liberation of the flue gas from solid particles and / or sulfur-containing components and / or components containing nitrogen oxide; - Generation of hydroxyl radicals in an electrolysis tank by electrolysis of an electrolyte consisting at least partially of at least one ionic liquid using a boron-doped diamond electrode; - Introduction of the flue gas into the electrolysis tank.- Treatment of the gaseous and / or dissolved components of the flue gas with the hydroxyl radicals in the electrolysis tank.
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