Abstract
Because H2S emitted by landfill sites has seriously endangered human health, its removal is urgent. H2S removal by use of an autotrophic denitrification landfill biocover has been reported. In this process, nitrate-reducing and sulfide-oxidizing bacteria use a reduced sulfur source as electron donor when reducing nitrate to nitrogen gas and oxidizing sulfur compounds to sulfate. The research presented here was performed to investigate the possibility of endogenous mitigation of H2S by autotrophic denitrification of landfill waste. The sulfide oxidation bioprocess accompanied by nitrate reduction was observed in batch tests inoculated with mineralized refuse from a landfill site. Repeated supply of nitrate resulted in rapid oxidation of the sulfide, indicating that, to a substantial extent, the bioprocess may be driven by functional microbes. This bioprocess can be realized under conditions suitable for the autotrophic metabolic process, because the process occurred without addition of acetate. H2S emissions from landfill sites would be substantially reduced if this bioprocess was introduced.
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This work was financially supported by the National Natural Science Foundation of China (41471408, and 41101453) and the Natural Science Foundation of Zhejiang Province (LY14D010001).
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Fang, Y., Du, Y., Feng, H. et al. Sulfide oxidation and nitrate reduction for potential mitigation of H2S in landfills. Biodegradation 26, 115–126 (2015). https://doi.org/10.1007/s10532-015-9720-y
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DOI: https://doi.org/10.1007/s10532-015-9720-y