Abstract: During the service life of landfills, large amounts of methane will be released due to the degradation of organic matter by microorganisms. Even with the gas collection devices, methane still escapes into the atmosphere. Methane gas is one of the important gases that cause the greenhouse effect. Methane-oxidizing bacteria is a microorganism that takes methane as the only carbon source, and has an excellent methane oxidation efficiency. In small and medium-sized landfills, old landfills and large
landfills where it is no longer economical to turn on gas collecting devices, the landfill final cover soil can be mixed with methaneoxidizing bacteria to oxidize methane gas and reduce the release of methane from landfill, so as to reduce the greenhouse effect and achieve the purpose of environmental protection The relevant research on methane oxidation efficiency of methane oxidizing bacteria at home and abroad was reviewed. The classification of methane-oxidizing bacteria and its mechanism of methane oxidation, the factors that affect the oxidation efficiency of methane-oxidizing bacteria and the application of methane-oxidizing bacteria in landfill sites are summarized, and the future research and application area of methane-oxidizing bacteria is outlined.

Key words: Landfills, methane, methane oxidizing bacteria, amended cover layer, methane bio-oxidation, biochar