Upgrading Biogas to Biomethane by Physical Absorption Process

Biogas is generated from anaerobic digestion of organic wastes by micro organisms. It is a relatively simple and economical method to produce a fuel from waste. It has a composition of methane as the main component with 50–70 percent, carbon dioxide around 30–40 percent and, hydrogen sulphide and moisture in trace quantities. The composition of biogas varies depending upon the substrates used. The raw biogas from the biogas digesters is properly scrubbed and purified to remove the unwanted gases like CO₂, H₂S and moisture upto a certain required level. In this work, a biogas upgrading system of 2 m³/h capacity has been developed for the removal of carbon dioxide and hydrogen sulphide from biogas, is indispensable to get biomethane. Developed biogas upgrading system, upgrades the biogas up to 96- 97% biomethane at 10 bar column-operating pressure with 1.5- 2.5 m³/h of biogas in-flow rate and 1.75 m³/h of water inflow rate.