When bio gas is cleaned what is taken out?

When biogas is cleaned, several impurities are removed to enhance its quality for use as a renewable energy source. Key components taken out include carbon dioxide (CO2), hydrogen sulfide (H2S), moisture, and other trace gases. The cleaning process can involve methods such as scrubbing, adsorption, and membrane separation, resulting in a purer form of methane (CH4) suitable for combustion or injection into the gas grid.