Simultaneous removal of NO and SO2 from simulated flue gas using Fe (II) EDTA coupled with catalytic regeneration

Bal Raj Deshwal, Neha Kundu

Abstract

Experiments were performed in a packed column to investigate the absorption of NO and SO2 into Fe (II) EDTA complex. The effect of various operating variables such as amount of activated carbon, pH, liquid flow rate, temperature, O2 content, and sulfite/bisulfite on the absorption of NO and SO2 by Fe (II) EDTA solution was examined. Fe (II) EDTA was regenerated by catalytic reduction of Fe (III) EDTA by sulfite ions in the presence of activated carbon. SO2 is almost 100% absorbed in the scrubbing solution during all the experiments. The rate of NO absorption increased with the amount of activated carbon. Absorption of NO increased with pH and reached to the maximum value at a pH of ~7.5 and decreased thereafter. The rate of NO absorption increased with the liquid flow rate and decreased with increasing O2 content. However, NO absorption decreased with the increasing temperature in the absence of activated carbon and increased in the presence of activated carbon. Further, the rate of NO Absorption improved with the sulfite/bisulfite concentration.