Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
Department of Energy and Refrigerating Air-Conditioning Engineering and Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors, National Taipei University of Technology, Taipei 10608, Taiwan.
J Hazard Mater. 2020 Jan 15;382:121046. doi: 10.1016/j.jhazmat.2019.121046. Epub 2019 Aug 20.
Understanding the electrode configuration is vital for the successful application of bioelectrochemical system (BES) in recalcitrant wastewater treatment. Especially in those traditional anaerobic processes that integrate with BES to construct effective hybrid bioreactors. Hybrid bioreactors employed granular graphite as electrode material achieved 86.62 ± 1.83% decolorization efficiency of azo dye acid orange 7 (AO7) at influent AO7 loading rate of 800 g/(m∙d) and it was about 6% higher than that with carbon fiber brush electrodes. Such electrodes were positioned above the anaerobic sludge layer and higher efficiency (8%) than the reactors with electrodes placed beneath the sludge layer was observed. Tracer experiments and modeling of residence time distribution indicated that the fluid pattern in hybrid bioreactors was modified to plug flow pattern and had a better consummate mixing ability compared to the conventional anaerobic reactor. Simulation using computational fluid dynamics technique showcased favorable mass transfer near electrode modules. The hydrodynamics of simulation and experimental results were connected by simplifying electrode module as a porous media model. This study thus proved that hybrid bioreactors can effectively enhance wastewater treatment comprehensively through the analysis of decolorization performance and hydrodynamics.
理解电极构型对于生物电化学系统（BES）在难处理废水处理中的成功应用至关重要。特别是在那些将 BES 与传统厌氧工艺集成以构建有效混合生物反应器的情况下。混合生物反应器采用颗粒状石墨作为电极材料，在进水偶氮染料酸性橙 7（AO7）负荷率为 800g/（m·d）的情况下，实现了 86.62±1.83%的脱色效率，比碳纤维刷电极高出约 6%。这些电极位于厌氧污泥层上方，与位于污泥层下方的反应器相比，观察到效率提高了 8%。示踪剂实验和停留时间分布模拟表明，混合生物反应器中的流体模式被修改为塞流模式，与传统厌氧反应器相比具有更好的完全混合能力。使用计算流体动力学技术进行模拟展示了电极模块附近良好的传质效果。通过将电极模块简化为多孔介质模型，将模拟的流体动力学与实验结果联系起来。因此，这项研究通过分析脱色性能和流体动力学，证明了混合生物反应器可以有效地全面增强废水处理效果。
