Selective inhibition of methanogenesis by acetylene in single chamber microbial electrolysis cells.
Selective inhibition of methanogenesis by acetylene in single chamber microbial electrolysis cells.
复制标题
DOI：
10.1016/j.biortech.2018.12.039
复制
发表时间：
2019-02
影响因子：
11.4
通讯作者：
Luguang Wang;S. Trujillo;Hong Liu
中科院分区：
文献类型：
--
作者：
Luguang Wang;S. Trujillo;Hong Liu
与许多其他生物制氢技术相比，用于制氢的微生物电解池（MEC）在底物的多功能性和氢气产量方面表现出巨大的优势。然而，产甲烷菌对氢气和乙酸盐的清除对单室 MEC 在混合培养中的应用提出了巨大的挑战。在这项研究中，我们研究了使用乙炔（一种低成本燃料和化学构件）选择性抑制单室 MEC 中产甲烷的可行性。结果表明，定期注射低浓度乙炔（1% 和 5%）可以成功抑制以乙酸盐和葡萄糖为底物的 MEC 中的产甲烷作用。然而，外产电的电流产生以及发酵细菌和外产电之间的互养并没有受到负面影响。与经典的产甲烷菌抑制剂 2-溴乙磺酸盐 (BES) 相比，低浓度乙炔在 MEC 中表现出优异的有效性。这些结果证明了使用乙炔作为一种经济有效的 MEC 产甲烷抑制剂的巨大潜力。
Microbial electrolysis cells (MECs) for hydrogen production exhibit great advantages over many other biohydrogen production techniques in terms of versatility of substrate and hydrogen yield. However, hydrogen and acetate scavenging by methanogens puts forward a great challenge to the application of single chamber MECs when using mixed culture. In this study, we investigated the feasibility of using acetylene, a low-cost fuel and chemical building block, to selectively inhibit methanogenesis in single chamber MECs. Results demonstrate that the periodical injection of low concentration acetylene (1% and 5%) can successfully inhibit methanogenesis in MECs using both acetate and glucose as substrates. Current generation by exoelectrogens and the syntrophy between fermentative bacteria and exoelectrogens, however, were not negatively affected. Compared with the classic methanogen inhibitor, 2-Bromoethanesulfonate (BES), the low concentration acetylene demonstrates superior effectiveness in MECs. These results demonstrate the great potential of using acetylene as a cost-effective inhibitor against methanogenesis in MECs.