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Effect of applied voltage on membrane fouling in the amplifying anaerobic electrochemical membrane bioreactor for long-term operation
RSC Advances ( IF 3.9 ) Pub Date : 2021-09-22 , DOI: 10.1039/d1ra05500c Mengjing Cao 1, 2 , Yongxiang Zhang 1, 2 , Yan Zhang 1, 2
RSC Advances ( IF 3.9 ) Pub Date : 2021-09-22 , DOI: 10.1039/d1ra05500c Mengjing Cao 1, 2 , Yongxiang Zhang 1, 2 , Yan Zhang 1, 2
Affiliation
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A novel and amplifying anaerobic electrochemical membrane bioreactor (AnEMBR, R2) was constructed and operated for a long time (204 days) with synthetic glucose solution having an average chemical oxygen demand (COD) of 315 mg L−1, at different applied voltages and room temperatures. More than twice sodium bicarbonate was added for maintaining a pH of around 6.7 in the supernatant of the reactor R2, close to that of a control reactor called anaerobic membrane bioreactor (AnMBR, R1), after 138 days. And the transmembrane pressure (TMP) for the R2 system was only 0.534 bar at the end of operation and 0.615 bar for the R1 system. Although the electrostatic repulsion force contributed to pushing away the pollutants (proteins, polysaccharose and inorganic salt deposits, and so on), more microorganisms adsorbed and accumulated on the membrane surface after the whole operation, which might result in a rapid increase in membrane filtration resistance in the long-term operation. There were much more exoelectrogenic bacteria, mainly Betaproteobacteria, Deltaproteobacteria and Grammaproteobacteria, on the cathode and the dominant methanogen Methanothrix content on the cathode was three times higher than the AnMBR. The study provides an important theoretical foundation for the application of AnEMBR technology in the treatment of low organic strength wastewater.
中文翻译：
外加电压对长期运行放大厌氧电化学膜生物反应器膜污染的影响
一种新型的放大厌氧电化学膜生物反应器（AnEMBR，R2）被构建并运行了很长时间（204天），合成葡萄糖溶液的平均化学需氧量（COD）为315 mg L -1，在不同的施加电压和室温下。在 138 天后，添加超过两倍的碳酸氢钠以维持反应器 R2 的上清液中的 pH 值在 6.7 左右，接近称为厌氧膜生物反应器 (AnMBR，R1) 的对照反应器的 pH 值。R2 系统的跨膜压力 (TMP) 在运行结束时仅为 0.534 bar，而 R1 系统为 0.615 bar。虽然静电斥力有助于推开污染物（蛋白质、多糖和无机盐沉积物等），但在整个操作过程中，更多的微生物吸附并聚集在膜表面，可能导致膜过滤阻力迅速增加在长期运行中。有更多的产电细菌，主要是 Betaproteobacteria，阴极上的Methanothrix含量是 AnMBR 的三倍。该研究为AnEMBR技术在低有机浓度废水处理中的应用提供了重要的理论基础。
更新日期：2021-09-22
中文翻译：
外加电压对长期运行放大厌氧电化学膜生物反应器膜污染的影响
一种新型的放大厌氧电化学膜生物反应器（AnEMBR，R2）被构建并运行了很长时间（204天），合成葡萄糖溶液的平均化学需氧量（COD）为315 mg L -1，在不同的施加电压和室温下。在 138 天后，添加超过两倍的碳酸氢钠以维持反应器 R2 的上清液中的 pH 值在 6.7 左右，接近称为厌氧膜生物反应器 (AnMBR，R1) 的对照反应器的 pH 值。R2 系统的跨膜压力 (TMP) 在运行结束时仅为 0.534 bar，而 R1 系统为 0.615 bar。虽然静电斥力有助于推开污染物（蛋白质、多糖和无机盐沉积物等），但在整个操作过程中，更多的微生物吸附并聚集在膜表面，可能导致膜过滤阻力迅速增加在长期运行中。有更多的产电细菌，主要是 Betaproteobacteria，阴极上的Methanothrix含量是 AnMBR 的三倍。该研究为AnEMBR技术在低有机浓度废水处理中的应用提供了重要的理论基础。
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