Dept. of Environmental Engineering, Chungbuk National University, Cheongju, Republic of Korea.
Jeonbong Co. Ltd. Cheongju, Republic of Korea.
Bioresour Technol. 2017 Jun;234:273-280. doi: 10.1016/j.biortech.2017.02.022. Epub 2017 Feb 8.
Microbial electrolysis cells (MECs) are being studied to improve the efficiency of anaerobic digesters and biogas production. In the present study, we investigated the effects of electrochemical reactions in AD-MEC (anaerobic digester combined with MECs) on changes in the microbial communities of bulk sludge through 454-pyrosequencing analysis, as well as the effect of these changes on anaerobic digestion. Methanobacterium beijingense and Methanobacterium petrolearium were the dominant archaeal species in AD, while Methanosarcina thermophila and Methanobacterium formicicum were dominant in AD-MEC at steady-state. There were no substantial differences in dominant bacterial species. Clostridia class was more abundant than Bacteroidia class in both reactors. Compared to AD, AD-MEC showed a 40% increase in overall bacterial population, increasing the removal of organic matters and the conversion of volatile fatty acids (VFAs). Thus, the MEC reaction more effectively converts organic matters to VFAs and activates microbial communities favorable for methane production.
微生物电解池（MEC）被研究用于提高厌氧消化器和沼气生产的效率。在本研究中，我们通过 454 焦磷酸测序分析，研究了 AD-MEC（厌氧消化器与 MEC 结合）中的电化学反应对大量污泥微生物群落变化的影响，以及这些变化对厌氧消化的影响。北京甲烷杆菌和石油甲烷杆菌是 AD 中的主要古菌种类，而嗜热甲烷古菌和产甲烷杆菌在稳态的 AD-MEC 中占优势。优势细菌种类没有显著差异。在两个反应器中，梭菌纲比拟杆菌纲更丰富。与 AD 相比，AD-MEC 显示出总细菌种群增加了 40%，这增加了有机物的去除和挥发性脂肪酸（VFAs）的转化。因此，MEC 反应更有效地将有机物转化为 VFAs，并激活有利于甲烷生成的微生物群落。
