title: Middle-thermophilic sulfur-oxidizing bacteria Thiomonas sp. RAN5 strain for hydrogen sulfide removal.
abstract: 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 degrees 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.
authors.affiliation: Graduate School of Agricultural Science Tohoku University, Miyagi, Japan.
authors.forename: Ryoki
authors.initials: R
authors.lastname: Asano
authors.forename: Kayako
authors.initials: K
authors.lastname: Hirooka
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nakai
mesh_terms: D000393:Air Pollutants / Q000737:chemistry / Q000378:metabolism*; D000693:Anaerobiosis; D020562:Betaproteobacteria / Q000145:classification* / Q000378:metabolism*; D019149:Bioreactors; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006862:Hydrogen Sulfide / Q000737:chemistry / Q000378:metabolism*
chemical_list: D000393:Air Pollutants; D006862:Hydrogen Sulfide