High strength wastewater treatment accompanied by power generation using air cathode microbial fuel cell
High strength wastewater treatment accompanied by power generation using air cathode microbial fuel cell
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DOI：
10.1016/j.apenergy.2012.12.037
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发表时间：
2013-05
期刊：
影响因子：
11.2
通讯作者：
S. Sevda;X. Dominguez-Benetton;K. Vanbroekhoven;H. Wever;T. R. Sreekrishnan;D. Pant
中科院分区：
文献类型：
--
作者：
S. Sevda;X. Dominguez-Benetton;K. Vanbroekhoven;H. Wever;T. R. Sreekrishnan;D. Pant
微生物燃料电池为同时进行生物发电和废水处理提供了一种新的方法。采用膜-电极组合的空气阴极MFC进行了3个周期(共160天)的运行试验，结果表明，该系统可用于处理化学需氧量为9978 mg/L的糖蜜混合废水(高浓度废水)作为基质产生生物电。以三种不同成分的废水为基质。以原废水、半稀释废水和离心废水为底物，制备MFCs。运行第14天，原废水的最大电压输出为762 mV，最大功率密度为382.5 mW/m2(5.06W/m~3)。在此过程中，系统的内阻可达0.93cmCOD~2，总Ω_(−)的去除可达59%。离心废水的发电量很低(0.12 mW/m~2或4.2 mW/m~3)，这可能是由于有机基质的限制。在稀释废水上运行的MFC的功率密度为56.17 mW/m~2(2.25 mW/m~3)，COD的去除效率为70%。能量色散X射线能谱(EDX)分析结合其他表征方法证实了废水中有机物的分解，EDX和扫描电子显微镜(SEM)显示了所用材料的表面形貌，并显示了长期MFC工艺后电极和膜组成的变化。变性梯度凝胶电泳(DGGE)图谱显示，电化学活性细菌周围存在混合菌群，这些细菌在阳极表面建立了生物膜，因此与阳极介质中的悬浮细菌群落不同。这些结果表明，复杂的废水可以作为MFC发电的基质，并且可以得到较高的COD去除效率。
Microbial fuel cells (MFCs) present a novel method for simultaneous bioelectricity generation and wastewater treatment. In this study, an air–cathode MFC with membrane-electrode assembly was operated over three batch cycles (total of 160days) and results indicated that molasses mixed sewage wastewater (high strength wastewater) containing 9978mg/L of chemical oxygen demand (COD) could be used as substrate to produce bioelectricity with this system. Three different compositions of wastewater were used as substrate. The original wastewater, half-diluted wastewater and centrifuged wastewater were used as substrate in MFCs. Maximum voltage output of 762mV and maximal power density of 382.5mW/m2(5.06W/m3) were obtained with the original wastewater by the 14thday of operation. During this time the system evolved to 0.93Ωcm−2internal resistance and 59% removal of the total COD were achieved. Centrifuged wastewater showed poor performance in terms of power production (0.12mW/m2or 4.2mW/m3), presumably due to organic substrate limitations. The MFC running on diluted wastewater showed a power density of 56.17mW/m2(2.25mW/m3), with 70% COD removal. Energy-Dispersive X-ray spectroscopy (EDX) analysis, together with other characterization methods, confirmed the breakdown of organic compounds in the wastewater, EDX and Scanning Electron Microscopy (SEM) revealed the surface morphology of the materials utilized and showed the evolution in electrode and membrane composition after the long term MFC processes. Denaturing Gradient Gel Electrophoresis (DGGE) profiles showed the presence of mixed populations enclosing the electrochemically-active bacteria that established a biofilm on the anode surface and as such differed from the suspended bacterial community in the anode medium. These results demonstrate that complex wastewater can be used as a substrate for power generation in MFCs and also can be treated with high COD removal efficiencies.