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首页> 外文期刊>Frontiers in Energy Research >Toward an Energy Efficient Wastewater Treatment: Combining a Microbial Fuel Cell/Electrolysis Cell Anode With an Anaerobic Membrane Bioreactor
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Toward an Energy Efficient Wastewater Treatment: Combining a Microbial Fuel Cell/Electrolysis Cell Anode With an Anaerobic Membrane Bioreactor

机译：迈向高效节能废水处理：将微生物燃料电池/电解池阳极与厌氧膜生物反应器相结合

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Recently, it has been shown that combining a bioelectrochemical system (BES) with an anaerobic membrane bioreactor (AnMBR) to produce electricity can reduce the overall energy consumption of wastewater treatment. In this study, we tested the recently proposed concept that integrates a microbial anode into an AnMBR, under application relevant conditions, for the treatment of synthetic brewery wastewater. We developed two system configurations: a filtering anode with stainless steel filter plate; and a hybrid anode, in which a polymeric membrane is combined with stainless steel mesh. As fouling is problematic in AnMBRs, we investigated the effect of two fouling mitigation methods, namely electrochemical cleaning and application of a turbulence promotor, on the permeate fluxes and current densities. We also investigated the effect of cathode (counter electrode) position on the permeate fluxes and current densities in filtering and hybrid anode. Our results revealed that permeate fluxes were influenced by the membrane pore size; and dropped below 5 L m-2 hr-1 on day 3 with filter grade 0.5 ??m; whereas similar values of permeate flux were observed after five days of operation with the membrane with filter grade 0.1 ??m. COD removal across the membrane reached up to 644 mg L-1 indicating improvement in energy efficiency and effluent quality of the AnMBR. The location of cathode did not influence permeate fluxes and current densities, but permeate pH was largely affected. Electrochemical cleaning improved permeate fluxes more than two-fold (18.9 L m-2 hr-1 after 7 days of operation) compared to the operation of the 0.1 ??m membrane without a cleaning procedure. Application of a turbulence promotor increased permeate fluxes and current densities in filtering anode. The hybrid anode resulted in similar current densities, but higher permeate fluxes as compared to the filtering anode, which dropped below 20 L m-2 hr-1 only after 8 days of operation. The hybrid anode configuration is an attractive option that combines high permeate fluxes on conventional non-conductive filters with current generation on an inexpensive conductive material. In summary, our results demonstrate that combining BES with AnMBR is a promising approach towards an energy efficient wastewater treatment.
机译：近来，已经表明，将生物电化学系统（BES）与厌氧膜生物反应器（AnMBR）结合使用来发电可以减少废水处理的总能耗。在这项研究中，我们测试了最近提出的概念，该概念在应用相关条件下将微生物阳极集成到AnMBR中，用于处理合成啤酒废水。我们开发了两种系统配置：带不锈钢滤板的过滤阳极;杂化阳极，其中聚合物膜与不锈钢网结合。由于AnMBR中的结垢是有问题的，因此我们研究了两种结垢缓解方法（即电化学清洗和湍流促进剂的应用）对渗透通量和电流密度的影响。我们还研究了阴极（对电极）位置对过滤和混合阳极中渗透通量和电流密度的影响。我们的结果表明，渗透通量受膜孔径的影响。并在第3天降到5 L m-2 hr-1以下，过滤器等级为0.5 ?? m;而使用滤清器等级为0.1 ?? m的膜操作5天后，观察到相似的渗透通量值。整个膜上的COD去除量高达644 mg L-1，表明AnMBR的能效和出水质量得到改善。阴极的位置不影响渗透通量和电流密度，但渗透pH受到很大影响。与没有清洗程序的0.1 ?? m膜的操作相比，电化学清洗将渗透通量提高了两倍多（操作7天后为18.9 L m-2 hr-1）。湍流促进剂的应用增加了过滤阳极中的渗透通量和电流密度。混合阳极的电流密度相近，但与过滤阳极相比，其渗透通量更高，而过滤阳极仅在运行8天后降至20 L m-2 hr-1以下。混合阳极配置是一种有吸引力的选择，它结合了常规非导电过滤器上的高渗透通量与廉价导电材料上的电流生成。总而言之，我们的结果表明，将BES与AnMBR结合使用是实现节能废水处理的一种有前途的方法。

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