Metal chelate absorption coupled with microbial reduction for the removal of NOx from flue gas

A novel process for the removal of NOx from flue gas by a combined Fe(II)EDTA absorption and microbial reduction has been demonstrated. Fe(II)EDTA-NO and Fe(III)EDTA (EDTA: ethylenediaminetetraacetate) can be effectively reduced to the active Fe(II)EDTA in the reactor containing microorganisms. In a steady-state absorption and regeneration process, the final removal efficiency of NO is up to 88%. The effects of four main parameters (i.e. NOx O-2 and SO2 concentrations, and the amount of cyclic solution) on NOx removal efficiency were experimentally investigated at 50 degrees C. The results provide some insight into conditions required for the successful removal of NOx from flue gas using the approach of Fe(II)EDTA absorption combined with microbial reduction. (c) 2005 Society of Chemical Industry