Department of Chemical Engineering, Durban University of Technology, Green Engineering Research Group, Faculty of Engineering and the Built Environment, Steve Biko, S4 Level 1, Durban, 4000, South Africa.
Department of Chemical Engineering, Mangosuthu University of Technology, Environmental Pollution and Remediation Research Group, Faculty of Engineering, P.O. Box 12363, Durban, 4026, South Africa.
Chem Asian J. 2023 Jul 3;18(13):e202300256. doi: 10.1002/asia.202300256. Epub 2023 Jun 1.
The selectivity of catalytic materials suitable for oxygen reduction potential of bio-electrochemical systems is very affluent. Therefore, exploring magnetite and static magnetic field as alternative option to promote microbial electron transfer comes in handy. In this study, the application of magnetite-nanoparticles and a static magnetic field on a microbial fuel cell (MFC) in anaerobic digestion was investigated. The experimental set-up included four 1 L biochemical methane potential tests: a) MFC, b) MFC with magnetite-nanoparticles (MFCM), c) MFC with magnetite-nanoparticles and magnet (MFCMM), and d) control. The highest biogas production obtained was 545.2 mL/g VS in the MFCMM digester, which was substantially greater than the 117.7 mL/g VS of the control. This was accompanied by high contaminant removals for chemical oxygen demand (COD) of 97.3%, total solids (TS) of 97.4%, total suspended solids (TSS) of 88.7%, volatile solids (VS) 96.1%, and color of 70.2%. The electrochemical efficiency analysis revealed greater maximum current density of 12.5 mA/m and coulombic efficiency of 94.4% for the MFCMM. Kinetically, the cumulative biogas produced data obtained were well fitted on the modified Gompertz models and the greatest coefficient of determination (R =0.990) was obtained in the MFCMM. Therefore, the application of magnetite-nanoparticles and static magnetic field on MFC showed a high potential for bioelectrochemical methane production and contaminant removal for sewage sludge.
催化材料对生物电化学系统的氧还原电位具有很高的选择性。因此，探索磁铁矿和静磁场作为促进微生物电子传递的替代选择是很有帮助的。本研究考察了磁铁矿纳米粒子和静磁场在厌氧消化中的微生物燃料电池（MFC）中的应用。实验装置包括四个 1 L 生化甲烷潜能测试：a）MFC、b）MFC 中添加磁铁矿纳米粒子（MFCM）、c）MFC 中添加磁铁矿纳米粒子和磁铁（MFCMM）和 d）对照。在 MFCMM 消化器中获得的最大沼气产量为 545.2 mL/g VS，比对照的 117.7 mL/g VS 有了显著提高。同时，化学需氧量（COD）、总固体（TS）、总悬浮固体（TSS）、挥发性固体（VS）和颜色的去除率也很高，分别为 97.3%、97.4%、88.7%、96.1%和 70.2%。电化学效率分析表明，MFCMM 的最大电流密度为 12.5 mA/m，库仑效率为 94.4%。动力学分析表明，获得的累积沼气产量数据很好地拟合了修正的 Gompertz 模型，在 MFCMM 中获得了最大的决定系数（R =0.990）。因此，磁铁矿纳米粒子和静磁场在 MFC 中的应用具有很高的生物电化学甲烷产生和污水污泥污染物去除潜力。
