Boosting biomethane yield and production rate with graphene: The potential of direct interspecies electron transfer in anaerobic digestion
Boosting biomethane yield and production rate with graphene: The potential of direct interspecies electron transfer in anaerobic digestion
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DOI：
10.1016/j.biortech.2017.05.017
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发表时间：
2017-09-01
影响因子：
11.4
通讯作者：
Murphy, Jerry D.
中科院分区：
文献类型：
--
作者：
Lin, Richen;Cheng, Jun;Murphy, Jerry D.
细菌与古菌之间的种间电子传递对提高厌氧消化的能量效率起着至关重要的作用。评估导电碳材料（即石墨烯纳米材料和活性炭）以增强乙醇（藻类产酸后的关键中间产物）的AD。添加石墨烯（1.0 g/L）导致最高的生物甲烷产率（695.0 +/- 9.1 mL/g）和生产速率（95.7 +/- 7.6 mL/g/d），对应于生物甲烷产率提高25.0%和生产速率提高19.5%。在石墨烯存在下，乙醇降解常数相应地提高了29.1%。微生物分析表明，产电细菌的Geetum和假单胞菌沿着与古菌甲烷杆菌和甲烷菌可能参与直接种间电子转移（DIET）。理论计算证明，石墨烯基DIET可以维持比常规氢转移高得多的电子转移通量。(C)2017爱思唯尔有限公司版权所有
Interspecies electron transfer between bacteria and archaea plays a vital role in enhancing energy efficiency of anaerobic digestion (AD). Conductive carbon materials (i.e. graphene nanomaterial and activated charcoal) were assessed to enhance AD of ethanol (a key intermediate product after acidogenesis of algae). The addition of graphene (1.0 g/L) resulted in the highest biomethane yield (695.0 +/- 9.1 mL/g) and production rate (95.7 +/- 7.6 mL/g/d), corresponding to an enhancement of 25.0% in biomethane yield and 19.5% in production rate. The ethanol degradation constant was accordingly improved by 29.1% in the presence of graphene. Microbial analyses revealed that electrogenic bacteria of Geobacter and Pseudomonas along with archaea Methanobacterium and Methanospirillum might participate in direct interspecies electron transfer (DIET). Theoretical calculations provided evidence that graphene-based DIET can sustained a much higher electron transfer flux than conventional hydrogen transfer. (C) 2017 Elsevier Ltd. All rights reserved.