The Influence of Light/Dark Cycle at Low Light Frequency on the Desulfurization by a Photosynthetic Microorganism

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概要

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• H_2S dissolved in water can be converted to elementary sulfur or sulfate by the photosynthetic bacterium Chlorobium thiosulfatophilum. The effects of the light/dark cycle on cell growth and the rate of sulfide removal were investigated to develop an appropriate fermentation strategy. Dark fermentation was also studied without addition of H_2S and CO_2 as electron and carbon sources. Average specific growth rates of bacterial cultures with a continnous supply of H_2S and CO_2 both in light and dark conditions were occurred in the range of 0.008 to 0.009h^<-1> indicating little dependence on the light/dark cycle, but about 25% of the growth rate that was occurred only in the presence of light. Average H_2S removal capacities for cultures grown under the light/dark cycles of 14/10, 12/12, and 9/15h, respectively, with a continuous supply of feed gases, were 0.08, 0.07, and 0.04μmol H_2S・min^<-1>/mg protein・l^<-1> in the dark, and was slightly less than those in the light. H_2S removal capacity with variation of the light/dark cycle was about 30-60% of that obtained in the continuously illuminated cultures. ATP concentration in the dark decreased from 0.43 to 0.37 mg ATP・mg protein^<-1> as the daily dark duration decreased from 15 to 10h. The production rate for lactic acid from a culture grown without a supply of mixtures of H_2S and CO_2 gases was 0.218g lactic acid・l^<-1>・h^<-1> much more than that grown with a supply of feed gas mixtures. Time-averaged concentrations of lactic acid produced overall during the light and dark periods were 13.7g lactic acid・l^<-1> during the light/dark cycle of 14/10h without a supply of feed gas, and 3.1 and 2.4g lactic acid・l^<-1> during the cycles of 9/15 and 14/10h, respectively, with a supply of feed gas.

• 公益社団法人日本生物工学会の論文
• 1999-04-25

著者

• Kim Byung-woo

  Department Of Chemical Engineering Sungkyunkwan University

• Jeong Guy-soo

  Department Of Chemical Engineering Sungkyunkwan University

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