The most utilised methods for municipal waste disposal in France are landfilling and incineration. Storage of organic waste materials to landfill in anaerobic conditions produces landfill gas, which contains enough methane for combustion and energy recovery; however, landfill gas also contains trace compounds that can be corrosive, aggressive and hazardous to the environment. Among these compounds, we were particularly interested in the main sulfur compound, H2S, which in addition, causes olfactory nuisances. Incineration produces mainly one solid waste: Municipal Solid Waste Incinerator (MSWI) bottom ash, which needs to be stored or reused after treatment. This study, supported by the Novergie company, focuses on a new way of reusing MSWI bottom ash in the treatment and purification of landfill gas. The overall study concerned the purification capacities of bottom ash either alone or as a part of a mixture (with coke) towards H2S and other potentially harmful landfill gas compounds. Only results concerning H2S are discussed in this paper. A pilot experimentation unit was developed and operated at the Biovale company engineered landfill (Loire). The purification potential of bottom ash from North-Lyon incineration plant was experimented on real landfill gas. The additional study of interactions between bottom ash and the two main compounds of landfill gas (methane and carbon dioxide) is particularly interesting within the context of a full scale implementation in an engineered landfill.