Enhanced methane production in an anaerobic digestion and microbial electrolysis cell coupled system with co-cultivation of Geobacter and Methanosarcina.
Enhanced methane production in an anaerobic digestion and microbial electrolysis cell coupled system with co-cultivation of Geobacter and Methanosarcina.
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DOI：
10.1016/j.jes.2015.07.006
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发表时间：
2016-04
影响因子：
6.9
通讯作者：
Q. Yin;Xiaoyu Zhu;G. Zhan;Tao Bo;Yanfei Yang;Y. Tao;Xiao-hong He;Da-ping Li;Zhiying Yan
中科院分区：
文献类型：
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作者：
Q. Yin;Xiaoyu Zhu;G. Zhan;Tao Bo;Yanfei Yang;Y. Tao;Xiao-hong He;Da-ping Li;Zhiying Yan
厌氧消化(AD) -微生物电解池（MEC）耦合系统已被证明是一种很有前途的生物甲烷生产工艺。本研究发现，在AD-MEC耦合体系中，geobacteri与methanosarcinain共培养，甲烷产率进一步提高24.1%，达到360.2 mL/g-COD，与厌氧消化器的理论甲烷产率相当。与未添加geobacter相比，添加geobacter后，最大化学需氧量（COD）去除率（216.8 mg COD/(L·hr)）和电流密度（304.3 A/m3）分别提高了1.3倍和1.8倍，整体能源效率达到74.6%。群落分析表明，geobacteri和methanosarcini可以共存于生物膜中，并通过循环伏安法证实了两者的电化学活性。我们的研究观察到，有geobacterter的AD反应器产生的总气体中二氧化碳含量仅为没有geobacter的相同反应器产生的二氧化碳含量的一半，这表明methanosarcinamay可能获得从geobacterter转移的电子，将二氧化碳还原为甲烷。综上所述，geobacteri不仅可以改善MEC系统的性能，还可以提高甲烷产量。
The anaerobic digestion (AD) and microbial electrolysis cell (MEC) coupled system has been proved to be a promising process for biomethane production. In this paper, it was found that by co-cultivatingGeobacterwithMethanosarcinain an AD–MEC coupled system, methane yield was further increased by 24.1%, achieving to 360.2 mL/g-COD, which was comparable to the theoretical methane yield of an anaerobic digester. With the presence ofGeobacter, the maximum chemical oxygen demand (COD) removal rate (216.8 mg COD/(L·hr)) and current density (304.3 A/m3) were both increased by 1.3 and 1.8 fold compared to the previous study withoutGeobacter, resulting in overall energy efficiency reaching up to 74.6%. Community analysis demonstrated thatGeobacterandMethanosarcinacould coexist together in the biofilm, and the electrochemical activities of both were confirmed by cyclic voltammetry. Our study observed that the carbon dioxide content in total gas generated from the AD reactor withGeobacterwas only half of that generated from the same reactor withoutGeobacter, suggesting thatMethanosarcinamay obtain the electron transferred fromGeobacterfor the reduction of carbon dioxide to methane. Taken together,Geobacternot only can improve the performance of the MEC system, but also can enhance methane production.