Removal of Hydrogen Sulfide by Sulfate-Resistant Acidithiobacillus thiooxidans AZ11(ENVIRONMENTAL BIOTECHNOLOGY)
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概要
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Toxic H_2S gas is an important industrial pollutant that is applied to biofiltration. Here, we examined the effects of factors such as inlet concentration and space velocity on the removal efficiency of a bacterial strain capable of tolerating high sulfate concentrations and low pH conditions. We examined three strains of Acidithiobacillus thiooxidans known to have sulfur-oxidizing activity, and identified strain AZ11 as having the highest tolerance for sulfate. A. thiooxidans AZ11 could grow at pH 0.2 in the presence of 74gl^<-1> sulfate, the final oxidation product of elemental sulfur, in the culture broth. Under these conditions, the specific sulfur oxidation rate was 2.9 g-S g-DCW (dry cell weight)^<-1> d^<-1>. The maximum specific sulfur oxidation rate of A. thiooxidans AZ11 was 21.2 g-S g-DCW^<-1> d^<-1>, which was observed in the presence of 4.2 g-SO_4^<2->l^<-1> and pH 1.5, in the culture medium. To test the effects of various factors on biofiltration by this strain, A. thiooxidans AZ11 was inoculated into a porous ceramic biofilter. First, a maximum inlet loading of 670 g-S m^<-3> h^<-1> was applied with a constant space velocity (SV) of 200 h^<-1> (residence time, 18s) and the inlet concentration of H_2S was experimentally increased from 200 ppmv to 2200 ppmv. Under these conditions, less than 0.1 ppmv H_2S was detected at the biofilter outlet. When the inlet H_2S was maintained at a constant concentration of 200ppmv and the SV was increased from 200 h^<-1> to 400 h^<-1> (residence time, 9s), an H_2S removal of 99.9% was obtained. However, H_2S removal efficiencies decreased to 98% and 94% when the SV was set to 500 h^<-1> (residence time, 7.2s) and 600 h^<-1> (residence time, 6s), respectively. The critical elimination capacity guaranteeing 96% removal of the inlet H_2S was determined to be 160g-S m^<-3> h^<-1> at a space velocity of 600 h^<-1>. Collectively, these findings show for the first time that a sulfur oxidizing bacterium has a high sulfate tolerance and a high sulfur oxidizing activity below pH 1.
- 社団法人日本生物工学会の論文
- 2006-04-25
著者
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LEE Eun
Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan College of
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LEE Nae
Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo
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Lee E
Department Of Food Science And Technology Kyungsung University
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Cho K‐s
Department Of Environmental Science And Engineering Ewha Womans University
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Cho Kyung-suk
Department Of Environmental Science And Engineering Ewha Womans University
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Ryu Hee
Department of Food Engineering, College of Engineering, Yonsei University
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Ryu H
Department Of Chemical And Environmental Engineering Soong Sil University
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Ryu Hee
Department Of Chemical And Environmental Engineering Soongsil University
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Lee Nae
Department Of Environmental Science And Engineering Ewha Womans University
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Lee Nae
Department Of Chemistry And Biotechnology School Of Engineering The University Of Tokyo
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Ryu Hee
Department Of Chemical And Environmental Engineering Soong Sil University
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Lee Eun
Department Of Anesthesiology And Pain Medicine Asan Medical Center University Of Ulsan College Of Me
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LEE Nae
Department of Advanced Materials Engineering, Sejong University
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