In this study, H2S removal by 2% potassium iodide (KI) impregnated
activated carbon adsorption was selected and introduced to
a biogas-to-electricity generation system set-up in a small pig farm
in Thailand. With the average inlet H2S concentration of about
2400 ppm to the adsorption unit, the adsorption tests showed that
the H2S removal efficiency could reach 100%. For the breakthrough
capacity of each batch (of two kilograms fresh adsorbent), the time
to reach 50 ppm for the best conditions used was in average 35 h,
which is equivalent to the adsorption capacity of 0.062 kg of H2S/
kg of adsorbent.