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首页> 外文期刊>Environmental Science & Technology >Production of electricity from acetate or butyrate using a single-chamber microbial fuel cell
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Production of electricity from acetate or butyrate using a single-chamber microbial fuel cell

机译：使用单室微生物燃料电池由乙酸盐或丁酸盐发电

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Hydrogen can be recovered by fermentation of organic material rich in carbohydrates, but much of the organic matter remains in the form of acetate and butyrate. An alternative to methane production from this organic matter is the direct generation of electricity in a microbial fuel cell (MFC). Electricity generation using a single-chambered MFC was examined using acetate or butyrate. Power generated with acetate (800 mg/L) (506 mW/m(2) or 12.7 mW/ L) was up to 66% higher than that fed with butyrate (1000 mg/L) (305 mW/m(2) or 7.6 mW/L), demonstrating that acetate is a preferred aqueous substrate for electricity generation in MFCs. Power output as a function of substrate concentration was well described by saturation kinetics, although maximum power densities varied with the circuit load. Maximum power densities and half-saturation constants were P-max = 661 mW/m(2) and K-s = 141 mg/L for acetate (218 Omega) and P-max = 349 mW/m(2) and K-s = 93 mg/L for butyrate (1000 Omega). Similar open circuit potentials were obtained in using acetate (798 mV) or butyrate (795 mV). Current densities measured for stable power output were higher for acetate (2.2 A/m(2)) than those measured in MFCs using butyrate (0.77 A/m(2)). Cyclic voltammograms suggested that the main mechanism of power production in these batch tests was by direct transfer of electrons to the electrode by bacteria growing on the electrode and not by bacteria-produced mediators. Coulombic efficiencies and overall energy recovery were 10-31 and 3-7% for acetate and 8-15 and 2-5% for butyrate, indicating substantial electron and energy losses to processes other than electricity generation. These results demonstrate that electricity generation is possible from soluble fermentation end products such as acetate and butyrate, but energy recoveries should be increased to improve the overall process performance.
机译：可以通过发酵富含碳水化合物的有机物质来回收氢，但是许多有机物仍以乙酸盐和丁酸盐的形式保留。由这种有机物生产甲烷的另一种方法是在微生物燃料电池（MFC）中直接发电。使用乙酸或丁酸酯检查了使用单腔MFC的发电。乙酸盐（800 mg / L）（506 mW / m（2）或12.7 mW / L）产生的功率比丁酸酯（1000 mg / L）（305 mW / m（2）或7.6 mW / L），表明乙酸盐是MFC中发电的首选水性底物。尽管最大功率密度随电路负载而变化，但饱和动力学很好地描述了作为底物浓度的函数的功率输出。最大功率密度和半饱和常数为乙酸盐（218 Omega）的P-max = 661 mW / m（2）和Ks = 141 mg / L，P-max = 349 mW / m（2）和Ks = 93 mg / L表示丁酸盐（1000Ω）。使用乙酸盐（798 mV）或丁酸盐（795 mV）可获得类似的开路电势。乙酸盐（2.2 A / m（2））的稳定功率输出电流密度高于使用丁酸酯的MFC（0.77 A / m（2））。循环伏安图表明，在这些批量测试中，产生电能的主要机理是通过电极上生长的细菌而不是细菌产生的介体将电子直接转移到电极上。醋酸盐的库仑效率和总能量回收率分别为10-31和3-7％，丁酸盐为8-15和2-5％，这表明除发电以外的其他过程会损失大量电子和能量。这些结果表明，可溶性发酵终产物（例如乙酸盐和丁酸盐）可以发电，但应提高能量回收率以改善整个工艺性能。

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