| Bacterial Assimilation of Carbon Dioxide by Electrochemical Bioreactor |
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| Abstract |
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A two-compartmented electrochemical bioreactor was designed to induce regeneration of NADH and generation
of hydrogen. Electric energy produced from solar cells charged to rechargeable battery. Anaerobic bacterial
consortium was cultivated in cathode compartment to enrich bacterial cells capable of growing with
carbon dioxide and hydrogen as a carbon and energy source. When bacterial cells were cultivated in the conventional
bioreactor to which electricity was not charged, no bacterial growth was observed and no metabolite
was produced. However, the bacterial cells cultivated in the electrochemical bioreactor produced acetate as a
metabolite and accumulated PHB(poly-β-hydroxy butyrate) in cytoplasm. When glucose was added to the electrochemical
bioreactor, butyrate concentration was greatly increased but PHB was not produced. In this study,
we found that carbon dioxide may be assimilated into acetate and PHB, which is a new technology for biological
fixation of carbon dioxide with natural energy. |
| Key Words:
Electrochemical bioreactor, NADH regeneration, solar energy, carbon dioxide fixation, anaerobic
bacterial consortium |
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