Middle-thermophilic sulfur-oxidizing bacteria Thiomonas sp. RAN5 strain for hydrogen sulfide removal

Ryoki Asano, Kayako Hirooka, Yutaka Nakai

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Hydrogen sulfide (H2S) is one of the most toxic and offensively odorous gases and is generated in anaerobic bioreactors. A middle-thermophilic sulfur-oxidizing bacterium (SOB), Thiomonas sp. strain RAN5, was isolated and applied for H2S removal from both artificial and anaerobically digested gas. When a bioreactor containing medium inoculated with RAN5 was aerated continuously with artificial gas (containing 100 ppm H2S) at 45 ° C for 156 hr, the H2S concentration in the vented gas was reduced by 99%. This was not affected by the presence of other microbes in the bioreactor. The H2S removal efficiency of the RAN5 bioreactor for anaerobically digested gas was greater than 99% at influent H2S concentrations ranging from 2 to 1800 ppm; the efficiency decreased to 90% at influent H2S concentrations greater than 2000 ppm. Thiomonas sp. strain RAN5 cannot survive at room temperature, and thus its leakage from a wastewater treatment plant would not damage sewage systems. These data suggest that Thiomonas sp. strain RAN5 may be a useful microorganism for H2S removal.

Original languageEnglish
Pages (from-to)38-43
Number of pages6
JournalJournal of the Air and Waste Management Association
Issue number1
Publication statusPublished - 2012 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Management, Monitoring, Policy and Law
  • Waste Management and Disposal
  • Medicine(all)
  • Pollution
  • Atmospheric Science


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