Degradation Characteristics of Hydrogen Sulfide, Methanethiol, Dimethyl Sulfide and Dimythyl Disulfide by Thiobacillus thioparus DW44 Isolated from Peat Biofilter

概要

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A bacterium, capable of the degradation of hydrogen sulfide(H_2S), methanethiol(MT), and dimethyl sulfide(DMS), as well as dimethyl disulfide(DMDS), was isolated on a thiosulfate plate from a suspension of DMDS-acclimated peat. The isolate was identified as Thiobacillus thioparus on the basis of its morphological, physiological and chemotaxonomical characteristics. The specific uptake rates(g-S・cell^<-1>・h^<-1>)of these sulfur compounds in the basal medium were determined as 7.49×10^<-14> for H_2S, 3.45×10^<-14> for MT, 4.14×10^<-15> for DMS and 1.23×10^<-14> for DMDS. When this strain was inoculated in sterilized fibrous peat, the maximum removal rates(V_m; g-S・kg-dry peat^<-1>・d^<-1>)of each gas singly by the peat biofilter were obtained by the application of the Michaelis-Menten equation : V_m(H_2S)=5.52,V_m(MT)=1.16,V_m(DMS)=0.50 and V_m(DMDS)=1.02. The specific uptake rates estimated for these compounds by this strain on the fibrous peat were similar to those in the basal medium. This strain also simultaneously degraded H_2S, MT and DMS in a mixture of the three gases, although the removal ratio of DMS in the mixed gases decreased compared with that in the case of the single gas. The removability of DMS was inhibited by the presence of MT, but accelerated by the presence of H_2S.
社団法人日本生物工学会の論文
1991-06-25