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首页> 外文期刊>Applied Microbiology and Biotechnology >Kinetics of consumption of fermentation products by anode-respiring bacteria
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Kinetics of consumption of fermentation products by anode-respiring bacteria

机译：阳极呼吸细菌消耗发酵产物的动力学

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We determined the kinetic response of a community of anode-respiring bacteria oxidizing a mixture of the most common fermentation products: acetate, butyrate, propionate, ethanol, and hydrogen. We acclimated the community by performing three consecutive batch experiments in a microbial electrolytic cell (MEC) containing a mixture of the fermentation products. During the consecutive-batch experiments, the coulombic efficiency and start-up period improved with each step. We used the acclimated biofilm to start continuous experiments in an MEC, in which we controlled the anode potential using a potentiostat. During the continuous experiments, we tested each individual substrate at a range of anode potentials and substrate concentrations. Our results show low current densities for butyrate and hydrogen, but high current densities for propionate, acetate, and ethanol (maximum values are 1.6, 9.0, and 8.2 A/m2, respectively). Acetate showed a high coulombic efficiency (86%) compared to ethanol and propionate (49 and 41%, respectively). High methane concentrations inside the MEC during ethanol experiments suggest that methanogenesis is one reason why the coulombic efficiency was lower than that of acetate. Our results provide kinetic parameters, such as the anode overpotential, the maximum current density, and the Monod half-saturation constant, that are needed for model development when using a mixture of fermentation products. When we provided no electron donor, we measured current due to endogenous decay of biomass (~0.07 A/m2) and an open-cell potential (?0.54 V vs Ag/AgCl) associated with biomass components active in endogenous respiration.
机译：我们确定了阳极呼吸细菌群落氧化最常见发酵产物混合物的动力学响应：乙酸盐，丁酸盐，丙酸盐，乙醇和氢气。我们通过在包含发酵产物混合物的微生物电解池（MEC）中进行三个连续的分批实验来使社区适应环境。在连续批生产实验中，库仑效率和启动时间随每个步骤而提高。我们使用适应的生物膜开始在MEC中进行连续实验，其中我们使用恒电位仪控制阳极电位。在连续实验过程中，我们在一定范围的阳极电势和基质浓度下测试了每种基质。我们的结果表明，丁酸和氢气的电流密度较低，而丙酸酯，乙酸盐和乙醇的电流密度较高（最大值分别为1.6、9.0和8.2 A / m2 ）。与乙醇和丙酸酯（分别为49％和41％）相比，乙酸盐显示出较高的库仑效率（86％）。在乙醇实验中，MEC内部的甲烷浓度较高，这表明甲烷生成是库仑效率低于乙酸盐的原因之一。我们的结果提供了动力学参数，例如阳极过电势，最大电流密度和Monod半饱和常数，这些参数对于使用发酵产物的混合物进行模型开发是必需的。当我们不提供电子供体时，我们测量的电流是由于生物质的内源性衰变（〜0.07 A / m2 ）和开孔电势（与Ag / AgCl相关的？0.54 V vs Ag / AgCl）引起的，内源性呼吸活动。

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