to circumvent the O2 inhibition, Melis and co-workers [2] introduced 2-stage photobiological ... Cyanobacteria also harbor bidirectional and uptake ... hydrogen under anaerobic, nitrogen-limited conditions, utilizing light as energy source.
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with anaerobically digested municipal biosolids that had been heat treated at 100°C for 15 minutes. During operation, repeated heat treatments of the biomass ...
Mar 12, 1982 - ... University, De Dreijen 11, 6703 BC Wageningen, ITe Netherlands .... the surfactant sensitizer, respectively; Ce(Me)sNBr, cetyltrimethyl-.
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Presentation Abstract Abstract Title:
Photofermentative Hydrogen Production by Rhodobacter sphaeroides Using Ethanol Fermentation Waste
Author Block:
L. Gabrielyan, H. Sargsyan, A. Trchounian; Yerevan State Univ., Yerevan, Armenia
Background: Purple non-sulfur bacteria such as Rhodobacter species are perspective candidates for the hydrogen (H2) production from food, sugars or alcohol-distilling technologies wastes. Ethanol fermentation waste from grain (distillers grains waste) is rich with various amino acids, proteins, sugars, as well as trace elements such as iron, magnesium, manganese, and others, which are essential for bacterial growth and H2 production. However, using of distillers grains waste for H2 production has not been considered yet. Methods: In the present work H2 production by Rh. sphaeroides MDC6521 from Armenian mineral spring during photo-fermentation of distillers grains has been investigated. Distillers grains were diluted at 2-, 5- or 10-folds using distilled water. Rh. sphaeroides was cultivated in anaerobic conditions upon illumination on Ormerod medium. Growth rate was determined as 0.693/doubling time with optical density. The H2 yield was calculated by the decrease of redox potential to negative values during bacterial growth. Results: Growth rate of Rh. sphaeroides has decreased during growth on distillers grains media in dilution-dependent manner, in compare to control cells grown in Ormerod medium. 5-10-folds dilutions gave ~1.4-fold suppressed growth rate. H2 production control cells was detected at 48 h growth, whereas in diluted (2-10-folds) distillers grains media H2 production was started at 24 h and continued during the growth up to 96 h. H2 production was not observed, when undiluted distillers grains were used. The H2 yield in
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Rh. sphaeroides from distillers grains was higher than that of control: the H2 yields in 2-5-folds diluted media after 48 h anaerobic growth were ~4.6- to 6.3-folds higher in compare to the control. That is possible due to the utili ation of available substrates and can be connected with formation of reductive power and ATP synthesis. Distillers grains can affect the activity of nitrogenase, the key H2 producing en yme of purple bacteria. onclusions: Thus, using of ethanol fermentation waste by Rh. sphaeroides can provide inexpensive H2 energy generation and simultaneous waste utili ation.
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