Simplifying microbial electrosynthesis reactor design.
Simplifying microbial electrosynthesis reactor design.
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DOI：
10.3389/fmicb.2015.00468
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发表时间：
2015
影响因子：
5.2
通讯作者：
Butler CS
中科院分区：
文献类型：
--
作者：
Giddings CG;Nevin KP;Woodward T;Lovley DR;Butler CS
微生物电合成是一种人工形式的光合作用，可以有效地将二氧化碳转化为有机商品；然而，这一过程之前只在具有可能成为扩大规模障碍的特点的反应堆中得到了证明。因此，以卵孢菌生物膜为研究对象，探讨了通过去除阴极的恒电位控制和阳极与阴极的分离膜来简化反应器设计的可能性。S. ovata将二氧化碳还原为醋酸盐，并作为普通石墨棒阴极的微生物催化剂作为电子供体。在传统的“H-cell”反应器中，阳极和阴极室由质子选择膜分开，当阴极的电子传递由直流电源供电而不是以前研究中使用的恒电位器平衡阴极供电时，微生物电合成的速率和柱状效率仍然很高。无膜反应器采用直流电源，阴极和阳极的位置避免了阴极的氧气暴露，保持了高的醋酸酯生产速率以及高的columbic和energetic效率。微生物电合成是可行的，没有隔膜分离阳极和阴极，再加上一个直流电源为电子传递提供能量，预计将大大简化未来的反应器设计和降低建设成本。
Microbial electrosynthesis, an artificial form of photosynthesis, can efficiently convert carbon dioxide into organic commodities; however, this process has only previously been demonstrated in reactors that have features likely to be a barrier to scale-up. Therefore, the possibility of simplifying reactor design by both eliminating potentiostatic control of the cathode and removing the membrane separating the anode and cathode was investigated with biofilms of Sporomusa ovata. S. ovata reduces carbon dioxide to acetate and acts as the microbial catalyst for plain graphite stick cathodes as the electron donor. In traditional ‘H-cell’ reactors, where the anode and cathode chambers were separated with a proton-selective membrane, the rates and columbic efficiencies of microbial electrosynthesis remained high when electron delivery at the cathode was powered with a direct current power source rather than with a potentiostat-poised cathode utilized in previous studies. A membrane-less reactor with a direct-current power source with the cathode and anode positioned to avoid oxygen exposure at the cathode, retained high rates of acetate production as well as high columbic and energetic efficiencies. The finding that microbial electrosynthesis is feasible without a membrane separating the anode from the cathode, coupled with a direct current power source supplying the energy for electron delivery, is expected to greatly simplify future reactor design and lower construction costs.