Green Engineering Research Group, Department of Chemical Engineering, Faculty of Engineering and The Built Environment, Steve Biko Campus, Durban University of Technology, S4 Level 1, Durban 4000, South Africa.
Department of Chemical Engineering, Faculty of Engineering, Mangosuthu University of Technology, P.O. Box 12363, Durban 4026, South Africa.
Molecules. 2022 May 24;27(11):3372. doi: 10.3390/molecules27113372.
This study examined the application of an electromagnetic field to anaerobic digestion by using an electromagnetic system (ES), a microbial electrolysis cell (MEC), and a control with no external force. The experimental work was performed by carrying out biochemical methane potential (BMP) tests using 1 L biodigesters. The bioelectrochemical digesters were supplied with 0.4 V for 30 days at 40 °C. The electromagnetic field of the ES was generated by coiling copper wire to form a solenoid in the BMP system, whereas the MEC consisted of zinc and copper electrodes inside the BMP system. The best performing system was the MEC, with a yield of 292.6 mL CH4/g chemical oxygen demand removed (CODremoved), methane content of 86%, a maximum current density of 23.3 mA/m2, a coulombic efficiency of 110.4%, and an electrical conductivity of 180 µS/cm. Above 75% removal of total suspended solids (TSS), total organic carbon (TOC), phosphate, and ammonia nitrogen (NH3-N) was also recorded. However, a longer exposure (>8 days) to higher magnetic intensity (6.24 mT) on the ES reduced its overall performance. In terms of energy, the MEC produced the greatest annual energy profit (327.0 ZAR/kWh or 23.36 USD/kWh). The application of an electromagnetic field in anaerobic digestion, especially a MEC, has the potential to maximize the methane production and the degradability of the wastewater organic content.
本研究通过使用电磁场系统（ES）、微生物电解池（MEC）和无外力控制的对照，考察了电磁场在厌氧消化中的应用。实验工作是通过使用 1 L 生物消化器进行生化甲烷潜力（BMP）测试来进行的。生物电化学消化器在 40°C 下施加 0.4 V 电压 30 天。ES 的电磁场是通过在 BMP 系统中缠绕铜丝形成螺线管产生的，而 MEC 则由 BMP 系统内的锌和铜电极组成。表现最好的系统是 MEC，其产甲烷量为 292.6 毫升 CH4/克化学需氧量去除（CODremoved），甲烷含量为 86%，最大电流密度为 23.3 mA/m2，库仑效率为 110.4%，电导率为 180 µS/cm。还记录了超过 75%的总悬浮固体（TSS）、总有机碳（TOC）、磷酸盐和氨氮（NH3-N）的去除。然而，在 ES 上长时间（>8 天）暴露于更高的磁场强度（6.24 mT）会降低其整体性能。就能源而言，MEC 产生了最大的年度能源收益（327.0 南非兰特/千瓦时或 23.36 美元/千瓦时）。电磁场在厌氧消化中的应用，特别是 MEC，有可能最大限度地提高甲烷产量和废水有机含量的可降解性。
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