Rajesh P P, Noori Md T, Ghangrekar M M
PK Sinha Centre for Bioenergy, Indian Institute of Technology, Kharagpur 721302, India.
Department of Agriculture and Food Engineering, Indian Institute of Technology, Kharagpur 721302, India.
Water Sci Technol. 2018 Jun;77(9-10):2491-2496. doi: 10.2166/wst.2018.206.
Methanogenic substrate loss is reported to be a major bottleneck in microbial fuel cell (MFC), which significantly reduces the power production capacity and coulombic efficiency (CE) of this system. Nitroethane is found to be a potent inhibitor of hydrogenotrophic methanogens in rumen fermentation process. Influence of nitroethane pre-treated sewage sludge inoculum on suppressing the methanogenic activity and enhancing the electrogenesis in MFC was evaluated. MFC inoculated with nitroethane pre-treated anodic inoculum demonstrated a maximum operating voltage of 541 mV, with CE and maximum volumetric power density of 39.85% and 20.5 W/m, respectively. Linear sweep voltammetry indicated a higher electron discharge on the anode surface due to enhancement of electrogenic activity while suppressing methanogenic activity. A 63% reduction in specific methanogenic activity was observed in anaerobic sludge pre-treated with nitroethane, emphasizing the significance of this pre-treatment for suppressing methanogenesis and its utility for enhancing electricity generation in MFC.
据报道，产甲烷底物损失是微生物燃料电池（MFC）的一个主要瓶颈，这显著降低了该系统的发电能力和库仑效率（CE）。已发现硝基乙烷是瘤胃发酵过程中氢营养型产甲烷菌的有效抑制剂。评估了硝基乙烷预处理的污水污泥接种物对抑制MFC中产甲烷活性和增强产电的影响。接种硝基乙烷预处理阳极接种物的MFC的最大工作电压为541 mV，CE和最大体积功率密度分别为39.85%和20.5 W/m³。线性扫描伏安法表明，由于产电活性增强同时抑制了产甲烷活性，阳极表面的电子放电更高。在用硝基乙烷预处理的厌氧污泥中，观察到比产甲烷活性降低了63%，强调了这种预处理对于抑制产甲烷的重要性及其在增强MFC发电方面的效用。
