Multiple anodic chambers sharing an algal raceway pond to establish a photosynthetic microbial fuel cell stack: Voltage boosting accompany wastewater treatment.
Multiple anodic chambers sharing an algal raceway pond to establish a photosynthetic microbial fuel cell stack: Voltage boosting accompany wastewater treatment.
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DOI：
10.1016/j.watres.2019.114955
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发表时间：
2019-08
期刊：
影响因子：
12.8
通讯作者：
Zhigang Yang;Lijie Zhang;Changliang Nie;Qingjie Hou;Shasha Zhang;Haiyan Pei
中科院分区：
文献类型：
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作者：
Zhigang Yang;Lijie Zhang;Changliang Nie;Qingjie Hou;Shasha Zhang;Haiyan Pei
光合作用微生物燃料电池(PMFC)可以利用废水生产可再生能源。然而，系统规模扩大仍然是阻碍PMFC用于实际应用的主要挑战。在这里，建立了一个由多个安装在藻类回旋池(ARP)中的阳极室组成的pMFC电池组，以在原型电容器电路的帮助下从厌氧消化出水中回收能量。该电堆的最高输出电压达到了1.4VPMFC单元和四个电容器。该系统通过控制充放电频率可以产生稳定的电压，当时间间隔减小到2 S时，输出电压稳定在0.60 V左右。在长期运行中，有电容器的电堆的最高功率密度达到2.34 W/m~3，比没有电容器的(1.32 W/m~3)高出77%。阳极液中约98%的铵被去除，这是由于铵的迁移效应造成的。电容电路对细菌群落组成的动态影响不大，有电容器的电堆比无电容器的电堆具有更稳定的细菌群落。随着功率密度的变化，细菌群落组成的变化表明，梭状芽胞杆菌和β变形杆菌的成员与发电有关。当功率密度较高时，附属于类杆菌的细菌受到抑制，尽管它们的数量在工艺结束时得到了丰富。本研究为PMFC技术的实用化提供了一种实用的方法，并通过对整个过程中的阳极细菌群落的分析，进一步揭示了在发电过程中起关键作用的主要细菌。
Photosynthetic microbial fuel cells (PMFCs) allow renewable energy production from wastewater. However, system scale-up is still a major challenge hindering the use of PMFCs for practical applications. Herein, a PMFC stack, which consisted of multiple anodic chambers installed in an algal raceway pond (ARP), was established to recovery energy from anaerobically digested effluent with the assistance of a prototypical capacitor circuit. The highest voltage output of the stack reached 1.4 V with four PMFC units and four capacitors. The system can produce stable voltages through controlling charging and discharging frequencies and the voltage output remained stable around 0.60 V when the time interval decreased to 2 s. During long-term operation, the highest power density of the stack with capacitors reached 2.34 W/m3, which was 77% higher than that without capacitors (1.32 W/m3). About 98% of the ammonium in the anolyte was removed, resulting from the ammonium migration effect. The dynamics of bacterial community compositions were not greatly influenced by the capacitor circuit, and the stack with capacitors had a more stable bacterial community compared to the stack without capacitors. The variations in bacterial community composition following power density changes indicated that members of the Clostridia and Betaproteobacteria were related to power generation. Bacteria affiliated to Bacteroidetes were inhibited when power density was high, though their numbers were enriched at the end of the process. This study promotes a practical method for developing the PMFC technology into real-world applications, and furthermore reveals the main bacteria that play vital roles in power generation by analysing the anodic bacterial community during the whole process.