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首页> 外文期刊>Bioprocess and Biosystems Engineering >Hydrogen production by hup(-) mutant and wild-type strains of Rhodobacter capsulatus from dark fermentation effluent of sugar beet thick juice in batch and continuous photobioreactors
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Hydrogen production by hup(-) mutant and wild-type strains of Rhodobacter capsulatus from dark fermentation effluent of sugar beet thick juice in batch and continuous photobioreactors

机译：分批和连续光生物反应器从甜菜浓汁的深色发酵废水中通过hup（-）突变株和野生型荚膜红细菌菌株产氢

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Photofermentative production of hydrogen is a promising and sustainable process; however, it should be coupled to dark fermentation to become cost effective. In order to integrate dark fermentation and photofermentation, the suitability of dark fermenter effluents for the photofermentative hydrogen production must be demonstrated. In this study, thermophilic dark fermenter effluent (DFE) of sugar beet thick juice was used as a substrate in photofermentation process to compare wild-type and uptake hydrogenase-deficient (hup (-)) mutant strains of Rhodobacter capsulatus by means of hydrogen production and biomass growth. The tests were conducted in small-scale (50 mL) batch and large-scale (4 L) continuous photobioreactors in indoor conditions under continuous illumination. In small scale batch conditions, maximum cell concentrations were 0.92 gdcw/L (c) and 1.50 gdcw/L (c), hydrogen yields were 34 % and 31 %, hydrogen productivities were 0.49 mmol/(L (c)center dot h) and 0.26 mmol/(L-c center dot h), for hup (-) and wild-type cells, respectively. In large-scale continuous conditions, maximum cell concentrations were 1.44 gdcw/L (c) and 1.87 gdcw/L (c), hydrogen yields were 48 and 46 %, and hydrogen productivities were 1.01 mmol/(L (c)center dot h) and 1.05 mmol/(L (c)center dot h), for hup (-) and wild-type cells, respectively. Our results showed that Rhodobacter capsulatus hup (-) cells reached to a lower maximum cell concentration but their hydrogen yield and productivity were in the same range or superior compared to the wild-type cells in both batch and continuous operating modes. The maximum biomass concentration, yield and productivity of hydrogen were higher in continuous mode compared to the batch mode with both bacterial strains.
机译：氢的光发酵生产是一个有前途且可持续的过程。但是，应将其与暗发酵结合使用以提高成本效益。为了整合暗发酵和光发酵，必须证明暗发酵废水适合光发酵制氢。在这项研究中，甜菜浓汁的嗜热黑发酵液（DFE）被用作光发酵过程中的底物，以比较通过产氢的荚膜红球菌的野生型和摄取氢酶缺陷型（hup（-））突变菌株。和生物量的增长。在室内条件下在连续照明下以小批量（50 mL）和大型（4 L）连续光生物反应器进行测试。在小批量生产条件下，最大电解池浓度为0.92 gdcw / L（c）和1.50 gdcw / L（c），氢气产率分别为34％和31％，氢气生产率为0.49 mmol /（L（c）中心点h） hup（-）细胞和野生型细胞分别为0.26 mmol /（Lc中心点h）。在大规模连续条件下，最大电池浓度为1.44 gdcw / L（c）和1.87 gdcw / L（c），氢气产率分别为48％和46％，氢气生产率为1.01 mmol /（L（c）中心点h ）和hup（-）细胞和野生型细胞的1.05 mmol /（L（c）中心点h）。我们的结果表明，在分批和连续操作模式下，荚膜红细菌hup（-）细胞均达到较低的最大细胞浓度，但与野生型细胞相比，它们的氢产率和生产率都处于相同范围或更高。与两种细菌菌株的分批模式相比，连续模式下的最大生物质浓度，氢气产率和生产率更高。

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