METHOD FOR NITROGEN OXIDES-CONTAINING WASTE GAS SCRUBBING

摘要

The invention relates to a method and equipment for scrubbingof nitrogen oxides-containing waste gases. The waste gas isscrubbed by recirculation washing liquid containing a chelate oftransition metals such as Fe (II) EDTA and the complex produced bythe above chelate and/or the treated chelate of a transition metalare biologically regenerated in the presence of an electronicdonor where the nitrogen oxide is reduced to molecular nitrogen.The biological reactor can be combined with a gas scrubber. Theelectronic donor is either hydrogen or methanol but it can also besulphite which originates from the sulphur dioxide in the wastegas.12 claims, 5 figures