Describe the processes of transformation of Biogas into Renewable Natural Gas.

Biogas is primarily produced through the anaerobic digestion of organic materials such as agricultural waste, food scraps, and wastewater sludge. It mainly consists of methane (CH4), carbon dioxide (CO2), and trace amounts of other gases like hydrogen sulfide (H2S) and ammonia (NH3). While biogas can be used directly for energy production, transforming it into Renewable Natural Gas (RNG) enhances its quality and makes it suitable for a wider range of applications, such as injection into the natural gas grid or use as a vehicle fuel. The process of converting biogas into RNG involves several key stages: upgrading, purification, and conditioning.

1. Biogas Upgrading: The first step in the conversion process is upgrading the raw biogas. Biogas typically contains 50–70% methane, but the presence of impurities, particularly CO2, dilutes its energy ________ ____ ___ ___ _______ ________ _____.
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