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首页> 外文期刊>Bioprocess and Biosystems Engineering >Two stirred-tank bioreactors in series enable continuous production of alcohols from carbon monoxide with Clostridium carboxidivorans
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Two stirred-tank bioreactors in series enable continuous production of alcohols from carbon monoxide with Clostridium carboxidivorans

机译：串联的两个搅拌釜式生物反应器可与一氧化碳梭菌（Clostridium carboxidivorans）从一氧化碳连续生产醇

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Microbial batch production of alcohols by fermentation of CO-rich gases with Clostridia is limited by low volumetric productivities due to the need for formation of organic acids first (acidogenic phase) followed by re-consumption of the acids to form alcohols (solventogenic phase). Continuous autotrophic production of alcohols was made possible with C. carboxidivorans by use of two continuously operated stirred-tank bioreactors in series without cell retention. The pH in the first reactor was controlled to pH 6.0 for continuous growth of the cells. Steady-state concentrations of 3.0 g L-1 acetate and 0.1 g L-1 butyrate were measured at a mean hydraulic residence time of 8.3 h. The pH in the second reactor was controlled to pH 5.0 for enhancing continuous formation of alcohols resulting in steady-state concentrations of 6.1 g L-1 ethanol, 0.7 g L-1 butanol, and 0.1 g L-1 hexanol at a mean hydraulic residence time of 12.5 h. Continuous formation of alcohols from CO was already observed in the first stirred-tank reactor parallel to the formation of acids, whereas re-consumption of acids as well as de-novo syntheses of alcohols from CO was shown in the second stirred-tank reactor. Thus, high final alcohol- to-acid ratios of 3.9 g(ethanol) g(acetate)(-1) and 4.4 g(butanol) g(butyrate)(-1) were achieved in the continuous syngas-fermentation process with C. carboxidivorans.
机译：由于需要首先形成有机酸（产酸相），然后重新消耗酸以形成醇（产溶剂相），因此通过梭状芽胞杆菌发酵富含一氧化碳的气体进行微生物分批生产醇受到了低容积生产率的限制。通过使用两个连续操作的连续搅拌罐式生物反应器，无细胞滞留，可以使用卡维衣藻（C.carboxidivorans）连续自养生产醇。将第一反应器中的pH控制为pH 6.0以使细胞连续生长。在8.3 h的平均水力停留时间下测量了3.0 g L-1乙酸盐和0.1 g L-1丁酸盐的稳态浓度。将第二个反应器中的pH值控制为pH 5.0，以增强醇的连续形成，从而在平均水力停留时间下获得6.1 g L-1乙醇，0.7 g L-1丁醇和0.1 g L-1己醇的稳态浓度。时间12.5小时。在第一个搅拌釜反应器中已经观察到由CO连续形成醇，与酸的形成平行，而在第二个搅拌釜反应器中显示出酸的重新消耗以及从CO中的新合成醇。因此，在使用C进行的连续合成气发酵过程中，获得了3.9 g（乙醇）g（乙酸盐）（-1）和4.4 g（丁醇）g（丁酸盐）（-1）的高最终醇酸比。碳氧化石。

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