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首页> 外文期刊>Environmental Science & Technology >Fate of H_2 in an Upflow Single-Chamber Microbiai Electrolysis Cell Using a Metal-Catalyst-Free Cathode
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Fate of H_2 in an Upflow Single-Chamber Microbiai Electrolysis Cell Using a Metal-Catalyst-Free Cathode

机译：使用无金属催化剂的上流单室微偏压电解槽中H_2的命运

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摘要

With the goal of maximizing the H_2-harvesting efficiency, we designed an upflow single-chamber microbiai electrolysis cell (MEC) by placing the cathode on the top of the MEC and carried out a program to track the fate of H_2 and electron equivalents in batch experiments. When the initial acetate concentration was 10 mM in batch-evaluation experiments lasting 32 h, the cathodic conversion efficiency (CCE) from coulombs (i.e., electron equivalents in current from the anode to the cathodel to H_2 was 98 ± 2%, the Coulombic efficiency (CE) was 60 ± 1%, the H_2 yield was 59 ± 2%, and methane production was negligible. However, longer batch reaction time (～ 7 days) associated with higher initial acetate concentrations (30 or 80 mM) led to significant H_2 loss due to CH_4 accumulation: up to 14 ± 1% and 16 ± 2% of the biogas at 30 and 80 mM of acetate, respectively. Quantitative PCR proved that no acetoclastic methanogens were present but that hydrogenotrophic methanogens (i.e., Methanobacteriales) were present on both electrodes. The hydrogenotrophic methanogens decreased the CCE by diverting H_2 generated at the cathode to CH_4 in the upflow single-chamber MEC. In some experiments, the CE was greater than 100%. The cause was anode-respiring bacteria oxidizing H_2 and producing current, which recycled H_2 between the cathode and the anodes, increasing CE to over 100%, but with a concomitant decline in CCE, despite negligible CH_4 formation.
机译：为了最大程度地提高H_2的捕集效率，我们通过将阴极放在MEC的顶部设计了一个上流单室微偏压电解槽（MEC），并执行了一个程序来跟踪H_2和电子当量的命运实验。在持续32 h的批次评估实验中，当初始乙酸盐浓度为10 mM时，库仑的阴极转化效率（CCE）（即，从阳极到阴极到H_2的电流中的电子当量为98±2％，库仑效率） （CE）为60±1％，H_2产率为59±2％，甲烷生成量可忽略不计，但较长的批反应时间（〜7天）与较高的初始乙酸盐浓度（30或80 mM）相关，由于CH_4积累导致的H_2损失：分别在30 mM和80 mM乙酸盐下分别达到沼气的14±1％和16±2％。定量PCR证明不存在破乳产甲烷菌，但存在氢营养型甲烷菌（即甲烷菌）。氢营养型产甲烷菌通过将在阴极上产生的H_2转移到上流单室MEC中的CH_4上来降低CCE，在某些实验中，CE大于100％，其原因是阳极呼吸细菌氧化。 H_2产生并产生电流，使H_2在阴极和阳极之间循环，使CE增至100％以上，但尽管形成的CH_4很小，但CCE却随之下降。

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  • 来源
    《Environmental Science & Technology》 |2009年第20期|7971-7976|共6页
  • 作者

    HYUNG-SOOL LEE; CESAR I. TORRES; PRATHAP PARAMESWARAM; BRUCE E. RITTMANN;

  • 作者单位

    Center for Environmental Biotechnology, The Biodesign Institute at Arizona State University, 1001 S. McAllister Ave. Tempe, Arizona 85287-5701;

    Center for Environmental Biotechnology, The Biodesign Institute at Arizona State University, 1001 S. McAllister Ave. Tempe, Arizona 85287-5701;

    Center for Environmental Biotechnology, The Biodesign Institute at Arizona State University, 1001 S. McAllister Ave. Tempe, Arizona 85287-5701;

    Center for Environmental Biotechnology, The Biodesign Institute at Arizona State University, 1001 S. McAllister Ave. Tempe, Arizona 85287-5701;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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