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首页> 外文期刊>RSC Advances >Deciphering the electron transfer mechanisms for biogas upgrading to biomethane within a mixed culture biocathode
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Deciphering the electron transfer mechanisms for biogas upgrading to biomethane within a mixed culture biocathode

机译：破解混合培养生物阴极中沼气转化为沼气的电子转移机制

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Biogas upgrading is an expanding field dealing with the increase in methane content of the biogas to produce biomethane. Biomethane has a high calorific content and can be used as a vehicle fuel or directly injected into the gas grid. Bioelectrochemical systems (BES) could become an alternative for biogas upgrading, by which the yield of the process in terms of carbon utilisation could be increased. The simulated effluent from a water scrubbing-like unit was used to feed a BES. The BES was operated with the biocathode poised at -800 mV vs. SHE to drive the reduction of the CO2 fraction of the biogas into methane. The BES was operated in batch mode to characterise methane production and under continuous flow to demonstrate its long-term viability. The maximum methane production rate obtained during batch tests was 5.12 +/- 0.16 mmol m(-2) per day with a coulombic efficiency (CE) of 75.3 +/- 5.2%. The production rate increased to 15.35 mmol m(-2) per day (CE of 68.9 +/- 0.8%) during the continuous operation. Microbial community analyses and cyclic voltammograms showed that the main mechanism for methane production in the biocathode was hydrogenotrophic methanogenesis by Methanobacterium sp., and that electromethanogenesis occurred to a minor extent. The presence of other microorganisms in the biocathode, such as Methylocystis sp. revealed the presence of side reactions, such as oxygen diffusion from the anode compartment, which decreased the efficiency of the BES. The results of the present work offer the first experimental report on the application of BES in the field of biogas upgrading processes.
机译：沼气升级是一个不断扩大的领域，涉及增加沼气中的甲烷含量以生产沼气。生物甲烷的热量含量很高，可以用作车辆燃料或直接注入燃气网中。生物电化学系统（BES）可以成为沼气升级的替代方案，通过这种方法可以提高过程的碳利用率。来自类似水洗涤装置的模拟流出物被用于给BES供料。 BES在生物阴极相对于SHE保持在-800 mV的条件下运行，以推动将沼气的CO2馏分还原为甲烷。 BES以间歇模式运行以表征甲烷的产生，并在连续流动下证明其长期可行性。批处理测试期间获得的最大甲烷生产率为每天5.12 +/- 0.16 mmol m（-2），库仑效率（CE）为75.3 +/- 5.2％。在连续操作过程中，生产率提高到每天15.35 mmol m（-2）（CE为68.9 +/- 0.8％）。微生物群落分析和循环伏安图表明，生物阴极中甲烷生成的主要机理是甲烷杆菌的氢营养甲烷化作用，而电甲烷的产生则很小。生物阴极中存在其他微生物，例如甲基囊藻。揭示了副反应的存在，例如氧气从阳极室扩散，这降低了BES的效率。本工作的结果提供了关于BES在沼气提质工艺领域中的应用的第一份实验报告。

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