Bacterial Assimilation of Carbon Dioxide by Electrochemical Bioreactor
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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.
Abstract
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.
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