Patent ID: 6905664
Filing Date: 2005-06-14
Classification: B01D

Abstract:
1. A method for the removal of micro-pollutants, in particular PCDD and PCDF, from combustion gases resulting from incineration of chlorinated organic wastes, said gases containing acidic products and traces of metals and being subjected to treatment with catalytically active reactants in a catalytic treatment unit, wherein said catalytically active reactants are obtained from said gases during treatment and are fed back to the catalytic treatment unit under conditions such that said reactants act as effective pollutant removal agents, said treatment comprising the steps of: a) quenching and saturating said combustion gases with a recirculating acidic liquid containing at least one catalytically active metal; b) absorbing PCDD/PCDF micro-pollutants from said combustion gases into said recirculating acidic liquid containing at least one catalytically active metal; c) concentrating said PCDD/PCDF micro-pollutants in said recirculating acidic liquid containing at least one catalytically active metal; d) obtaining said acidic liquid containing at least one catalytically active metal by absorbing said metal(s) from said combustion gases with the aid of an acid absorption medium; and e) recovering hydrochloric acid gas by absorption from the combustion gases and using a portion of such hydrochloric acid to produce the acid absorption medium, thereby forming a quenching and wet scrubbing sequence for removing not only macro-pollutants such as suspended solids, hydrochloric acid gas and metals, but also PCDD/PCDF micro-pollutants.