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This study explores the possibility of applying high-gravity rotating packed bed (HGRPB) in removing H 2 S and CO 2  from biogas. Ca(OH) 2  aqueous solution was used as the absorbent in this study. Different experimental conditions including solution pH, rotating speed ( RS ) of HGRPB, gas flow rate ( QG ), and liquid flow rate ( QL ) were investigated with respect to the removal efficiency ( E ) of H 2 S and CO 2 . The experimental and simulated results show that the optimal removal efficiency of H 2 S and CO 2  using HGRPB achieved nearly the same as 99.38 and 99.56% for removal efficiency of H 2 S and 77.28 and 77.86% for removal efficiency of CO 2 , 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).

Simultaneous removal efficiency of H 2 S and CO 2 by high-gravity rotating packed bed: Experiments and simulation