Carbon Fiber-Based Flow-Through Electrode System (FES) for Water Disinfection via Direct Oxidation Mechanism with a Sequential Reduction-Oxidation Process

Liu Hai; Ni Xin-Ye; Huo Zheng-Yang; Peng Lu; Li Guo-Qiang; Wang Chun; Wu Yin-Hu; Hu Hong-Ying

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Carbon Fiber-Based Flow-Through Electrode System (FES) for Water Disinfection via Direct Oxidation Mechanism with a Sequential Reduction-Oxidation Process

机译：碳纤维基流通电极系统（FES），用于通过直接氧化机理和顺序还原-氧化过程进行水消毒的水

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Flow-through configuration for electrochemical disinfection is considered as a promising approach to minimize the formation of toxic byproducts and energy consumption via the enhanced convective mass transport as compared with conventional flow-by one. Under this hydrodynamic condition, it is essential to ascertain the effect of sequential electro-redox processes with the cathode/anode then anode/cathode arrangements on disinfection performance. Here, carbon fiber felt (CFF) was utilized to construct two flow-through electrode systems (FESs) with sequential reduction-oxidation (cathode-anode) or oxidation-reduction (anode-cathode) processes to systematically compare their disinfection performance toward a model Escherichia coli (E. coli) pathogen. In-situ sampling and live/dead backlight staining experiments revealed that E. coli inactivation mainly occurred on anode via an adsorption-inactivation-desorption process. In reduction-oxidation system, after the cathode-pretreatment, bulk solution pH increased significantly, leading to the negative charge of E. coli cells. Hence, E. coli cells were adsorbed and inactivated easily on the subsequent anode, finally resulting in its much better disinfection performance and energy efficiency than the oxidation-reduction system. Application of 3.0 V resulted in similar to 6.5 log E. coli removal at 1500 L m(-2) h(-1) (50 mL min(-1)), suggesting that portable devices can be designed from CFF-based FES with potential application for point-of-use water disinfection.

机译：电化学消毒的流通配置被认为是一种有前途的方法，与传统的流通方式相比，通过增强的对流质量传递，可以最大程度地减少有毒副产物的形成和能耗。在这种流体动力条件下，必须确定依次进行的电氧化还原工艺对阴极/阳极然后阳极/阴极的布置对消毒性能的影响。在这里，碳纤维毡（CFF）用于构建两个具有顺序还原-氧化（阴极-阳极）或氧化还原（阳极-阴极）工艺的流通电极系统（FES），以将其消毒性能与模型进行系统比较大肠杆菌（E. coli）病原体。原位采样和活/死背光染色实验表明，大肠杆菌的失活主要发生在阳极，是通过吸附-失活-解吸过程。在还原-氧化系统中，经过阴极预处理后，本体溶液的pH值显着增加，导致大肠杆菌细胞带负电荷。因此，大肠杆菌细胞易于在随后的阳极上吸附和失活，最终导致其消毒性能和能效比氧化还原系统好得多。施加3.0 V电压可在1500 L m（-2）h（-1）（50 mL min（-1））下去除6.5 log E. coli，这表明便携式设备可通过基于CFF的FES与使用点水消毒的潜在应用。

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来源
《Environmental Science & Technology》 |2019年第6期|3238-3249|共12页
作者
Liu Hai; Ni Xin-Ye; Huo Zheng-Yang; Peng Lu; Li Guo-Qiang; Wang Chun; Wu Yin-Hu; Hu Hong-Ying;
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Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Microorganism Appl, Environm Simulat & Pollut Control State Key, Beijing 100084, Peoples R China;

Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Microorganism Appl, Environm Simulat & Pollut Control State Key, Beijing 100084, Peoples R China;

Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Microorganism Appl, Environm Simulat & Pollut Control State Key, Beijing 100084, Peoples R China;

Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Microorganism Appl, Environm Simulat & Pollut Control State Key, Beijing 100084, Peoples R China|Tsinghua Berkeley Shenzhen Inst, Shenzhen Environm Sci & New Energy Technol Engn L, Shenzhen 518055, Peoples R China;

Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Microorganism Appl, Environm Simulat & Pollut Control State Key, Beijing 100084, Peoples R China;

Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Microorganism Appl, Environm Simulat & Pollut Control State Key, Beijing 100084, Peoples R China;

Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Microorganism Appl, Environm Simulat & Pollut Control State Key, Beijing 100084, Peoples R China;

Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Microorganism Appl, Environm Simulat & Pollut Control State Key, Beijing 100084, Peoples R China|Tsinghua Berkeley Shenzhen Inst, Shenzhen Environm Sci & New Energy Technol Engn L, Shenzhen 518055, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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3. Disinfecting Water with the Carbon Fiber-Based Flow-Through Electrode System (FES): Towards Axial Dispersion and Velocity Profile [J] . Djamel Ghernaout, Noureddine Elboughdiri, Saad Ghareba, Open Access Library Journal . 2020,第4期

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4. Disinfection of Synthetic and Real Municipal Wastewater Effluent by Flow-Through Pulsed UV-Light Treatment Systems [C] . Gulsad Uslu, Ali Demirci, John M. Regan Annual International Meeting of the American Society of Agricultural and Biological Engineers . 2014

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Carbon Fiber-Based Flow-Through Electrode System (FES) for Water Disinfection via Direct Oxidation Mechanism with a Sequential Reduction-Oxidation Process

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