Removal of ozone from air by absorption in a rotating packed bed

Abstract

This work investigated the feasibility of ozone (O 3) absorption by H 2O 2 solution in a rotating packed bed (RPB). The overall volumetric gas-phase mass transfer coefficients ( K Ga) were determined as functions of pH of H 2O 2 solution, O 3 concentration, H 2O 2 concentration, RPB speed, gas flow rate, liquid flow rate, and RPB type. The K Ga values were highly dependent on the pH of H 2O 2 solution. Also, the K Ga values increased with O 3 concentration and H 2O 2 concentration. As expected, the RPB speed positively affected the K Ga values for all RPBs. Furthermore, the obtained results indicated that the K Ga values increased as the inner radius of the bed was increased and the outer radius of the bed was decreased. Moreover, the K Ga values increased with an increasing liquid flow rate and an increasing gas flow rate for all RPBs. The dependences of K Ga on the gas flow rate and the liquid flow rate indicated that the resistance to mass transfer in the gas-phase for O 3 absorption was higher than that in the liquid phase in the RPB.