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Electricity generation from artificial wastewater using an upflow microbial fuel cell

机译：使用上流微生物燃料电池从人造废水中发电

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The upflow microbial fuel cell (UMFC) was developed to generate electricity while simultaneously treating wastewater. During a five-month period of feeding a sucrose solution as the electron donor, the UMFC continuously generated electricity with a maximum power density of 170 mW/m(2). To achieve this power density, the artificial electron-mediator hexacyanoferrate was required in the cathode chamber. The power density increased with increasing chemical oxygen demand (COD) loading rates up to 2.0 g COD/ L/day after which no further increases in power density were observed, indicating the presence of limiting factors. The overarching limiting factor for the UMFC in this study was the internal resistance, which was estimated as 84 Q at the maximum power density, and restricted the power output by causing a significant decrease in operating potential. Low Coulombic efficiencies varying from 0.7 to 8.1% implied that the electron-transfer bacteria were incapable of converting all of the available organics into electricity, so the excessive substrate created niches for the growth of methanogens. We found that the soluble COD (SCOD) removal efficiencies remained over 90% throughout the operational period, mainly because of methanogenic activity, which accounted for 35 to 58% of the SCOD removed at a loading rate of 1.0 g COD/L/ day. Additionally, transport limitation due to insufficient substrate diffusion was shown by cyclic voltammetry (CV).
机译：开发了上流式微生物燃料电池（UMFC）来发电，同时处理废水。在以蔗糖溶液作为电子供体的五个月内，UMFC连续发电，最大功率密度为170 mW / m（2）。为了达到该功率密度，在阴极室中需要使用人工电子介体的六氰基高铁酸盐。功率密度随化学需氧量（COD）加载速率的增加而增加，最高达到2.0 g COD / L / day，此后未观察到功率密度的进一步增加，表明存在限制因素。在这项研究中，UMFC的最大限制因素是内部电阻，在最大功率密度下，其内部电阻估计为84 Q，并通过引起工作电位的显着降低来限制功率输出。库仑效率低至0.7％至8.1％不等，这意味着电子转移细菌无法将所有可用的有机物转化为电，因此过量的底物为产甲烷菌的生长创造了机会。我们发现，在整个操作期间，可溶性COD（SCOD）去除效率保持超过90％，这主要是由于产甲烷活性，在1.0 g COD / L / day的装载量下，其占去除率的35％至58％。此外，循环伏安法（CV）显示了由于底物扩散不足而引起的运输限制。

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