Microbial fuel cells (MFCs) are a recent biotechnology that can simultaneously produce electricity and treat wastewater. As the nature of industrial wastewater is very complex, and it may contain a variety of substrates—such as carbohydrates, proteins, lipids, etc.—previous investigations dealt with treatment of individual pollutants in MFCs; the potential of acetic acid, sucrose, albumin, blood, and their mixture has rarely been reported. Hence, the current investigation explored the contribution of each substrate, both separately and in mixture. The voltage generation potential, current, and power density of five different substrates—namely, acetic acid, sucrose, albumin, blood, and a mixture of all of the substrates—was tested in a dual-chambered, anaerobic MFC operated at 35 °C. The reaction time of the anaerobic batch mode MFC was 24 h, and each substrate was treated for 7 runs under the same conditions. The dual-chambered MFC consisted of anode and cathode chambers; the anode chamber contained the biocatalyst (sludge), while the cathode chamber contained the oxidizing material (KMnO₄). The maximum voltage of 769 mV was generated by acetic acid, while its corresponding values of current and power density were 7.69 mA and 347.85 mW, respectively. Similarly, being a simple and readily oxidizable substrate, acetic acid exhibited the highest COD removal efficiency (85%) and highest Coulombic efficiency (72%) per run. The anode accepted the highest number of electrons (0.078 mmol/L) when acetic acid was used as a substrate. The voltage, current, and power density generated were found to be directly proportional to COD concentration. The least voltage (61 mV), current (0.61 mA), and power density (2.18 mW) were observed when blood was treated in the MFC. Further research should be focused on testing the interaction of two or more substrates simultaneously in the MFC.

中文翻译：

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白蛋白、乙酸、蔗糖和血液在处理合成废水的微生物燃料电池中的生物能源潜力

微生物燃料电池 (MFC) 是一种最新的生物技术，可以同时发电和处理废水。由于工业废水的性质非常复杂，可能含有多种底物——如碳水化合物、蛋白质、脂质等——以前的研究涉及MFCs中单个污染物的处理；醋酸、蔗糖、白蛋白、血液及其混合物的潜在性鲜有报道。因此，当前的研究探索了每种底物的贡献，分别是单独的和混合的。在 35 °C 下运行的双室厌氧 MFC 中测试了五种不同底物（即乙酸、蔗糖、白蛋白、血液和所有底物的混合物）的电压产生电位、电流和功率密度. 厌氧间歇模式 MFC 的反应时间为 24 h，并且在相同条件下对每个基材处理7次。双室MFC由阳极室和阴极室组成；阳极室包含生物催化剂（污泥），而阴极室包含氧化材料（KMnO₄）。醋酸产生的最大电压为 769 mV，而其对应的电流和功率密度值分别为 7.69 mA 和 347.85 mW。同样，作为一种简单且易氧化的底物，乙酸在每次运行中表现出最高的 COD 去除效率 (85%) 和最高的库仑效率 (72%)。当使用乙酸作为底物时，阳极接受最高数量的电子 (0.078 mmol/L)。发现产生的电压、电流和功率密度与 COD 浓度成正比。当在 MFC 中处理血液时，观察到的电压 (61 mV)、电流 (0.61 mA) 和功率密度 (2.18 mW) 最低。进一步的研究应侧重于在 MFC 中同时测试两种或多种底物的相互作用。