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KMID : 1094720000050010048
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Biotechnology and Bioprocess Engineering
2000 Volume.5 No. 1 p.48 ~ p.48
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Characterization of sulfur oxidation by an autotrophic sulfur oxidizer,Thiobacillus sp. ASWW-2
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Lee Eun-Young
Cho Kyung-Suk
Ryu Hee-Wook
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Abstract
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An autotrophic sulfur oxidizer,Thiobacillus sp. ASWW-2, was isolated from activated sludge, and its sulfur oxidation activity was characterized.Thiobacillus sp. ASWW-2 could oxidize elemental sulfur on the broad range from pH 2 to 8. When 5?50 g/L of elemental sulfur was supplemented as a substrate, the growth and sulfur oxidation activity ofThiobacillus sp. ASWW-2 was not inhibited. The specific sulfur oxidation rate of strain ASWW-2 decreased gradually until sulfate was accumulated in medium up to 10 g/L. In the range of sulfate concentration from 10 g/L to 50 g/L, the sulfur oxidation rate could keep over 2.0 g-S/g-DCW-d. It indicated thatThiobacillus sp. ASWW-2 has tolerance to high concentration of sulfate.
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KEYWORD
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autotrophic sulfur oxidizing bacterium, elemental sulfur, tolerance to sulfate, biofilter
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