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Onset Investigation on Dynamic Change of Biohythane Generation and Microbial Structure in Dual-chamber versus Single-chamber Microbial Electrolysis Cells
Water Research ( IF 12.8 ) Pub Date : 2021-06-04 , DOI: 10.1016/j.watres.2021.117326
Shuai Luo 1 , Fubin Liu 2 , Boya Fu 1 , Kai He 3 , Heng Yang 3 , Xiaoyuan Zhang 1 , Peng Liang 1 , Xia Huang 1
Affiliation  

Biohythane is alternative fuel to replace fossil fuel for car combustion, and biohythane generation could be potential pathway for energy recovery from wastewater treatment. Microbial electrolysis cell (MEC) is electrochemical technique to convert waste to methane and hydrogen gas for biohythane generation, but the feasibility and stability of MEC needs further investigation to assure sustainable energy recovery. System configuration is paramount factor for electrochemical reaction and mass transfer, and this study was to investigate the configuration impact (single vs dual chamber) of MEC for biohythane generation rate and stability. This study showed that dual-chamber MEC could separate methane and hydrogen gas production in the anode and cathode, and combined both together to produce biohythane. To reduce ohmic resistance for higher current, cation exchange membrane (CEM) was removed from dual-chamber to single-chamber MEC. However, free hydrogen diffusion was allowed in the single chamber since CEM was removed. The diffused hydrogen and substrate towards the cathode would favor the methanogen growth, and thus the hydrogen was consumed to reduce the biohythane generation and energy recovery efficiency (i.e., 7.5 × 10−3 reduced to 5.7 × 10−3 kWh kg−1 degraded COD day−1 after converting dual-chamber to single-chamber MEC). Absolute abundance of methanogen in single-chamber MEC was greatly boosted, as Methanosarcina and Methanobacteriale on the anode surface, increased by 132% and 243%, respectively, while the original dual-chamber MEC could maintain Geobacter growth for high current generation. This is the keystone study to demonstrate the importance of dual-chamber MEC for the feasibility and stability for the biohythane generation, building up the foundation to use electrochemical device to convert the organic waste to the alternative biohythane.



中文翻译:

双室与单室微生物电解池中生物乙烷生成和微生物结构动态变化的初步研究

生物乙烷是替代化石燃料用于汽车燃烧的替代燃料,而生物乙烷的产生可能是从废水处理中回收能量的潜在途径。微生物电解槽 (MEC) 是一种将废物转化为甲烷和氢气以产生生物甲烷的电化学技术,但 MEC 的可行性和稳定性需要进一步研究以确保可持续的能量回收。系统配置是电化学反应和传质的首要因素,本研究旨在研究 MEC 的配置影响(单室与双室)对生物乙烷生成速率和稳定性的影响。该研究表明,双室 MEC 可以在阳极和阴极中分离甲烷和氢气的产生,并将两者结合在一起产生生物甲烷。为了降低欧姆电阻以获得更高的电流,阳离子交换膜(CEM)从双室到单室MEC。然而,由于去除了 CEM,在单室中允许自由氢扩散。向阴极扩散的氢和底物将有利于产甲烷菌的生长,因此消耗氢以降低生物乙烷的产生和能量回收效率(即 7.5 × 10-3减少到 5.7 × 10 -3  kWh kg -1在将双室 MEC 转换为单室 MEC 后降低 COD 天-1)。单室MEC中产甲烷菌的绝对丰度大大提高,阳极表面的甲烷八叠球菌甲烷杆菌分别增加了132%和243%,而原来的双室MEC可以维持地杆菌生长以产生高电流。这是证明双室MEC对生物乙烷产生的可行性和稳定性的重要性的基石研究,为使用电化学装置将有机废物转化为替代生物乙烷奠定了基础。

更新日期:2021-06-18
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