Biogas is produced by anaerobic digestion with methanogens or anaerobic organisms, which digest material inside a closed system, or perform fermentation of biodegradable materials. How does methanogen help in producing biogas?

Explanation

Some bacteria, such as methanogens, are commonly found in the anaerobic sludge during the sewage treatment. Biogas is a mixture of gases produced during the microbial activities and which is used as fuel. The type of the gas that is produced depends upon the type of microbes and the organic substrates they utilise. Methanogens produce methane, `CO_2`, hydrogen gas by anaerobic digestion of cellulosic plant part.