Hydrogen Sulfide Generation Suppression by Nitrate Addition – Application to Solid Waste Landfill Site
American Journal of Environmental Protection
Volume 3, Issue 5, October 2014, Pages: 267-274
Received: Oct. 22, 2014; Accepted: Oct. 31, 2014; Published: Nov. 10, 2014
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Authors
Shumpei Kitazaki, Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Nagasaki, Japan
Kai Xiao, Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Nagasaki, Japan
Kei Nakagawa, Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Nagasaki, Japan
Tomonori Kindaichi, Department of Civil and Environmental Engineering, Hiroshima University, Hiroshima, Japan
Hiroshi Asakura, Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Nagasaki, Japan
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Abstract
In Japan, three deaths were reported at an inert solid waste landfill site after exposure to hydrogen sulfide (H2S) generated at the site. H2S gas is produced when sulfate-reducing bacteria (SRB) convert sulfate derived from waste gypsum board under anaerobic conditions. The recommended countermeasure is to supply oxygen by installing gas venting pipes. However, a large cost is necessary for pipe installation and the pipes are not applicable to coastal landfill sites. On the other hand, H2S generation suppression by nitrate (NO3) addition has been reported in sewage systems. In this study, in order to develop a method to suppress H2S generation by NO3 addition at a landfill site, the extent of suppression was quantitatively estimated. When NO3 reagent was added at the rate of 0.46 mmol-NO3/(L•d) into a liquid from which H2S gas was generated at the rate of 0.21 ± 0.05 mmol-H2S/(L•d), H2S generation rate was decreased to approximately 1/4 of the original rate. Although it was difficult to maintain the concentration of NO3 because it tended to disappear rapidly, the frequent addition of NO3 reagent to maintain the concentration of approximately 430 mg-NO3/L enabled us to control H2S concentration to below 1000 ppmv for one month and H2S generation rate to below 1/20 of the original rate.
Keywords
Landfill Site, Waste Gypsum Board, Hydrogen Sulfide, Generation Suppression, Nitrate
To cite this article
Shumpei Kitazaki, Kai Xiao, Kei Nakagawa, Tomonori Kindaichi, Hiroshi Asakura, Hydrogen Sulfide Generation Suppression by Nitrate Addition – Application to Solid Waste Landfill Site, American Journal of Environmental Protection. Vol. 3, No. 5, 2014, pp. 267-274. doi: 10.11648/j.ajep.20140305.20
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