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H2S emission from landfill site has seriously endangered human health and need urgent disposal.Functional microbe like nitrate-reducing,sulfide-oxidizing bacteria(NR-SOB)could achieve simultaneous denitrification and desulfurization by using nitrate and sulfide as electron acceptors and electron donors,respectively.In this study,the behavior of denitrification and desulfurization was studied in two simulated landfill with different operation modes,namely conventional landfill(CL)and leachate directly recirculated landfill(RL).