Semi-continuous anolyte circulation to strengthen CO2 bioelectromethanosynthesis with complex organic matters as the e-/H+ donor for simultaneous biowaste refinery
Semi-continuous anolyte circulation to strengthen CO2 bioelectromethanosynthesis with complex organic matters as the e-/H+ donor for simultaneous biowaste refinery
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半连续阳极电解液循环，以复杂有机物作为同步生物废物精炼厂的e-/H供体，强化CO2生物电甲烷合成
DOI：
10.1016/j.cej.2021.133123
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发表时间：
2021-10
影响因子：
15.1
通讯作者：
Xu K.-Q.
中科院分区：
文献类型：
--
作者：
Zhen G.;Zheng S.;Han Y.;Zhang Z.;Lu X.;Xu K.-Q.
CO2生物电甲烷合成是一种很有前途的CO2捕集和利用策略。在此过程中，阳极氧化过程中电子（e-）和质子（H+）的连续产生对阴极CO2的高效电还原和过程稳定性至关重要。然而，质子交换膜（PEM）的污染很容易阻碍质子传递。在微生物电解池（MEC）中，通过人工通道强化阳极室质子向阴极室的传递，并将富含H+的阳极液半连续地循环至阴极室，为CO2的电还原提供质子。结果表明，阴极电解液循环（18.5mL/d·L-反应器）的甲烷日产量是无循环（2.9mL/d·L-反应器）的5.4倍。同时，阳极氧化对有机物的降解效率较高，COD、蛋白质和多糖的去除率分别达到95.6 ± 1.9%、96.3 ± 3.7%和99.1 ± 0.2%，为CO2的电转化提供了连续的e-/H+供体. 16 S rRNA基因焦磷酸测序分析表明，阳极生物膜中存在大量的蛋白质利用菌（Bacteroidetes）（14.11%）和多糖利用菌（Thermotogae）（18.49%），有利于有机组分的生物降解。阴极生物膜中甲烷菌的丰度较高（81.07%），表明阴极生物膜中存在着高浓度的甲烷生物电合成。在双电极系统中建立了互养共生关系，为生物废弃物的处理和CO2的电甲烷合成提供了一个有利的环境和节能途径。
CO2bioelectromethanosynthesis represents a promising strategy for the capture and utilization of CO2. In such process, the continuous generation of electron (e-) and proton (H+) in anodic oxidation are of prime importance for the efficient cathodic CO2electroreduction and process stability. Proton transfer, however, is very easy to be hindered due to the fouling of proton exchange membrane (PEM). In this study, an artificial channel in microbial electrolysis cell (MEC) was proposed to strengthen the transport of protons from anodic to cathodic compartment, and H+-rich anolyte was semi-continuously circulated to the cathodic chamber to provide protons for CO2electroreduction. The results indicated that the daily CH4yield in cathode with anolyte circulation (18.5 mL/d·L-reactor) was 5.4-fold higher than that without circulation (2.9 mL/d·L-reactor). Meanwhile, efficient anodic biodegradation of organic components was observed with COD, proteins and polysaccharides removal of up to 95.6 ± 1.9%, 96.3 ± 3.7% and 99.1 ± 0.2% respectively, which supplied a continuous e-/H+donor for CO2electroconversion. 16S rRNA gene pyrosequencing analysis identified a large number of proteins-utilizingBacteroidetes(14.11%) and polysaccharides-consumingThermotogae(18.49%) in anodic biofilm, conductive to the biodegradation of organic components. Moreover, a high abundance ofMethanobacterium(81.07%) was detected to prevail in cathodic biofilm, demonstrating the occurrence of highly enhanced CH4bioelectrosysthesis. The syntrophic and symbiotic relationship was established in the dual-bioelectrode system, creating a beneficial environment and an energy-efficient approach for biowaste refinery and CO2electromethanosynthesis.
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