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KMID : 0903519970400010058
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1997 Volume.40 No. 1 p.58 ~ p.64
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H2 Production by a Purple Sulfur Bacterium Blooming in Lake Kaiike
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Abstract
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H₂ production by Chromatium sp., a large purple sulfur bacterium blooming in lake Kaiike, under various environmental conditions was examined. Chromatium sp. produced Hz only in the presence of light and HZS. Maximum H₂ production (0.01 μ㏖/hr/(㎎ dry cell weight)) was obtained in the solution of 20 ㎎ H₂S-S/ℓ under low light intensity (1000 lux) at 30℃. H₂ production was severely inhibited by the presence of N₂ or NH₄^+. The rate observed for Chromatium sp. was relatively low compared to that of other phototrophic bacteria. Chromatium sp. is probably a most potent H₂ producing species in lake Kaiike, since the bacterium readily produced H₂ photoautotrophically even at low light intensities by the application of suboptimal H₂S concentrations. Based on the photoautotrophic characteristics of bacterial Hz production, it is suggested that Chromatium sp. can be an economic and practical species for biological H₂ production system, particularly in temperate region.
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