Electrochemical inactivation of bacteria with a titanium sub-oxide reactive membrane

WATER RESEARCH

卷:145

Article

Liang, Shangtao^1,3  Lin, Hui²  Habteselassie, Mussie¹  Huang, Qingguo¹ 

[1] Univ Georgia, Coll Agr & Environm Sci, Dept Crop & Soil Sci, Griffin, GA 30223 USA

[2] Dongguan Univ Technol, Res Ctr Ecoenvironm Engn, Dongguan 523808, Peoples R China

[3] AECOM Environm, Atlanta, GA 30309 USA

关键词: Reactive electrochemical membrane;    Microfiltration;    Pathogens;    Water disinfection;   

DOI  :  10.1016/j.watres.2018.08.010

来源: Elsevier

【 摘 要 】

A reactive electrochemical membrane (REM) system was developed with titanium suboxide micro filtration membrane serving as the filter and the anode, and was examined to inactivate Escherichia coli (E. coli) in water at various current densities. After passing through the membrane filter, the concentration of E. coli decreased from 6.46 log CFU/mL to 0.18 log CFU/mL. The REM operation and effects, including membrane pressure, anode potential, protein leakage, and cell morphology, were characterized under different treatment conditions. It was found that several mechanisms, including membrane filtration, external electrical field influence, and direct oxidation, functioned in concert to lead to bacteria removal and inactivation, and direct oxidation likely played the major role. As revealed by scanning electron microscope and extracellular protein analysis, high current density and voltage caused severe cell damage that resulted in partial or complete cell disintegration. The removal of a model virus, bacteriophage MS2, was also investigated at the current density of 10 mA cm(-2) and achieved 6.74 log reduction compared to the original concentration (10(11) PFU/mL). In addition to illustration of mechanisms, this study may provide a potentially promising approach that is suitable for decentralized treatment to meet dispersed water disinfection needs. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free