The methane produced by a waste lagoon is considered “dirty” because it often contains impurities like water vapor, hydrogen sulfide, and other gases mixed in with the methane. If not cleaned, these impurities can make the raw biogas corrosive, smelly, and less efficient for energy use.
Before methane can be used as fuel for electricity, heating, or vehicles, it usually needs to be purified through a process called gas cleaning or upgrading. This removes the unwanted components, leaving mostly pure methane, which burns cleaner and works better in engines or turbines.
