Simultaneous removal efficiency of H2S and CO2 by high-gravity rotating packed bed: Experiments and simulation

This study explores the possibility of applying high-gravity rotating packed bed (HGRPB) in removing H S and CO from biogas. Ca(OH) aqueous solution was used as the absorbent in this study. Different experimental conditions including solution pH, rotating speed ( ) of HGRPB, gas flow rate ( ), and liquid flow rate ( ) were investigated with respect to the removal efficiency ( ) of H S and CO . The experimental and simulated results show that the optimal removal efficiency of H S and CO using HGRPB achieved nearly the same as 99.38 and 99.56% for removal efficiency of H S and 77.28 and 77.86% for removal efficiency of CO , respectively. Such efficiencies corresponded with the following optimal conditions: a solution pH of 12.26, HGRPB reactor with the rotating speed of 1,200 rpm, the gas flow rate of 2.46 (L/min), and the liquid flow rate of 0.134 (L/min).