HYDROGEN SULFIDE GENERATION SUPPRESION BY VARIOUS TYPES OF OXYGEN ADDITION – APPLICATION TO SOLID WASTE LANDFILL SITE

Abstract

 In Japan, some 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 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 at a landfill site, the extent of H₂S suppression and organic carbon reduction by NO₃ or gaseous oxygen addition were quantitatively estimated. H₂S generation ratio was decreased to below 0.1 and organic carbon reduction rate was increased by NO₃ reagent or gaseous oxygen addition. However, NO₃ extracted from compost had no suppression nor organic carbon reduction effect.