Bacteria inactivation at a sub-stoichiometric titanium dioxide reactive electrochemical membrane

JOURNAL OF HAZARDOUS MATERIALS

卷:319

Article

Guo, Lun¹  Ding, Kai²  Rockne, Karl³  Duran, Metin²  Chaplin, Brian P.¹ 

[1] Univ Illinois, Dept Chem Engn, 810 South Clinton St, Chicago, IL 60607 USA

[2] Villanova Univ, Dept Civil & Environm Engn, 800 Lancaster Ave, Villanova, PA 19085 USA

[3] Univ Illinois, Dept Civil & Mat Engn, 842 W Taylor St, Chicago, IL 60607 USA

关键词: Electrochemical disinfection;    Reactive electrochemical membrane;    Bacteria;   

DOI  :  10.1016/j.jhazmat.2016.05.051

来源: Elsevier

【 摘 要 】

This study investigated the use of a sub-stoichiometric TiO2 reactive electrochemical membrane (REM) for the inactivation of a model Escherichia coli (E. coli) pathogen in chloride-free solutions. The filtration system was operated in dead-end, outside-in filtration model, using the REM as anode and a stainless steel mesh as cathode. A 1-log removal of E. coli was achieved when the electrochemical cell was operated at the open circuit potential, due to a simple bacteria-sieving mechanism. At applied cell potentials of 1.3 and 3.5 V neither live nor dead E. coli cells were detected in the permeate stream (detection limit of 1.0 cell mL(-1)), which was attributed to enhanced electrostatic bacteria adsorption at the REM anode. Bacteria inactivation in the retentate solution increased as a function of the applied cell potential, which was attributed to transport of E. con to the REM and stainless steel cathode surfaces, and direct contact with the local acidic and alkaline environment produced by water oxidation at the anode and cathode, respectively. Clear evidence for an E. coli inactivation mechanism mediated by either direct or indirect oxidation was not found. The low energy requirement of the process (2.0-88 W h m(-3)) makes the REM an attractive method for potable water disinfection. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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