Nourbakhsh Fatemeh, Pazouki Mohammad, Mohsennia Mohsen
NonMetallic Materials Research Group, Niroo Research Institute (NRI), End of Dadman Street, Tehran Province 1468613113, Iran.
Young Researchers and Elite Club, Karaj Branch, Islamic Azad University, Karaj, Iran.
Iran J Biotechnol. 2020 Apr 1;18(2):e2292. doi: 10.30498/IJB.2020.137279.2308. eCollection 2020 Apr.
The use of Microbial Fuel Cells (MFCs) has been expanded in recent years due to their ability in producing bioelectricity and treating wastewater simultaneously. However, there are still some obstacles to use MFC on an industrial scale. Regardless of the restriction of electrodes applied in the electron transferring process, there are also some other factors having strong roles in reducing the power density of MFCs.
In this paper, the effect of three categories of limiting factors such as kinds of microorganisms ( and .), substrate type (Glucose and acetate), and features reactor components have been investigated on the power density generation. Simultaneous investigation of these parameters and demonstration of which parameters would induce more power density can help to improve the scale‑up of MFCs.
Two types of MFCs with different designs were constructed and inoculated with pure cultures of PTCC 5269 and The OCV (Open Circuit Voltage) and polarization curves of MFCs were measured when the quasi‑steady‑state condition was observed.
Based on results, utilizing acetate in the presence of both microorganisms led to approximately 60% higher power density compared to glucose. The comparison of maximum power densities of different reactor designs indicated an approximately 17-70 % increase of power generation. However, the resultant shows modification of reactor design even when other parameters are not optimal can increase power density more than three times.
Actually, reactor design has the most important role in the power density with the MFC while the effects of substrate and microorganism parameters are not inappreciable.
近年来，微生物燃料电池（MFCs）的应用不断扩展，因为它们能够同时产生生物电和处理废水。然而，在工业规模上使用MFC仍存在一些障碍。除了电子转移过程中所用电极的限制外，还有其他一些因素对降低MFC的功率密度有很大影响。
本文研究了三类限制因素，即微生物种类（和.）、底物类型（葡萄糖和乙酸盐）以及反应器组件特性对功率密度产生的影响。同时研究这些参数并证明哪些参数会产生更高的功率密度，有助于改进MFC的放大应用。
构建了两种不同设计的MFC，并接种了PTCC 5269和的纯培养物。当观察到准稳态条件时，测量MFC的开路电压（OCV）和极化曲线。
结果表明，在两种微生物存在的情况下，使用乙酸盐比使用葡萄糖产生的功率密度高出约60%。不同反应器设计的最大功率密度比较表明，发电量增加了约17% - 70%。然而，结果表明，即使其他参数不是最优的，改变反应器设计也能使功率密度提高三倍以上。
实际上，反应器设计对MFC的功率密度起着最重要的作用，而底物和微生物参数的影响也不可忽视。
