Abstract

The gas flow rate for hazardous air pollutants (HAPs) emission is generally high and their concentrations are low (in ppm levels). When the high flow-rate and low concentration gases are treated, the size of the equipment and the operating cost become large. The new concept - plasma desorption - was investigated, which is able to convert the high flow-rate and low concentration to the low flow-rate and high-concentration emission using the nonthermal plasma. The fundarnental characteristics of plasma desorption and regeneration for NO was investigated to achieve the new way of controlling NOx emissions. The experimental study showed that the higher adsorption was achieved with repeated adsorption due to the redistribution towards the surface. In addition, the gas concentration increased 15 times and the flow rate was reduced to 1/167. Further improvement can be attained using the intermittent plasma desorption with the high flow rate.