The Effect of Corncob-Active Carbon Adsorbent Mass on Methane and Carbon Dioxide Content on Biogas Purification

The use of biogas is now starting to be considered as the fuel of choice. However, the concentration of methane (CH₄) and carbon dioxide (CO₂) in biogas is very low. Therefore, biogas requires treatment to reduce the carbon dioxide content so that the CH₄ concentration increases, by carrying out biogas purification. The research, the use of adsorbents from corncob waste containing lignocellulose as activated carbon has the potential to reduce CO₂ levels. Samples from biogas purification were tested by gas chromatography–mass spectrometry (GC–MS) to determine the CO₂ and CH₄ content of biogas. The 2³-factorial design analysis was used to determine the variables including the adsorbent mass, biogas flow rate, and time during purification that affects the CO₂ and CH₄ concentrations of biogas purification. The results showed that increasing the mass of corncob-activated carbon as an adsorbent decreased the CO₂ concentration of biogas and increased the CH₄ ratio of biogas from biogas purification.