Effects of gas flow rate and beam voltage on the radiolytic decomposition of H2S by electron beam in the continuous flow system

Recently, electron beam processes for treating gas pollutant have been studied extensively. However, only a limited number of studies have investigated the effects of operating parameters such as gas flow rate, beam voltage, and beam current which are particularly important in continuous flow electron beam systems. This study investigated the radiolytic decomposition of hydrogen sulfide (H 2 S) under continuous flow conditions, with a specific focus on the effects of gas flow rate and beam voltage on H 2 S removal. When removal efficiency was evaluated as a function of absorbed dose, the efficiency increased with increasing gas flow rate, and the effect of beam voltage was not significantly. In contrast, when removal efficiency was expressed as a function of beam current, a different trend emerged. Removal efficiency decreased as gas flow rate increased, and increased as beam voltage increased. These observations highlight the importance of considering beam current intensity, in addition to absorbed dose, when studying radiolytic decomposition phenomena in continuous flow electron beam processes. Furthermore, the radiolytic decomposition of H 2 S in this system followed a 2nd-order kinetic model rather than a 1st-order model. • Electron beam process for the decomposition of H 2 S in the continuous flow was studied. • Current intensity of electron beam significantly affected the removal efficiency of H 2 S. • Radiolytic decomposition of H 2 S in the continuous flow electron beam process showed the 2nd-order reaction kinetics.