Removing H 2 S from biogas that is produced from anaerobic digestion of palm oil mill effluent is a crucial step in order for the biogas to be utilized as a source of energy. In this study, palm shell activated carbon (PSAC) prepared by steam activation was used to adsorb H 2 S from simulated biogas. The parameters studied were H 2 S concentration, adsorption temperature and space velocity. The effect of these parameters towards breakthrough adsorption capacity was studied using statistical

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... ysis with Design Expert Software. H 2 S concentration and space velocity were found to be significant in affecting the breakthrough adsorption capacity.Adsorption temperature on its own was found not to have significant effect on the breakthrough adsorption capacity but its interaction with other parameters was found to be significant. Characterization of fresh and spent PSAC confirmed and provided further information on the adsorption of sulfur species on PSAC pore surface.