Efficient Bacterial Inactivation by Transition Metal Catalyzed Auto-Oxidation of Sulfite

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Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, California 92521, United States
Hubei Key Lab of Biomass Resource Chemistry and Environmental Biotechnology, School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, P. R. China
§ Masonic Cancer Center, University of Minnesota, 2231 Sixth Street SE, Minneapolis, Minnesota 55455, United States
Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
Guangdong Key Laboratory of Agro-Environmental Integrated Control, Guangdong Institute of Eco-Environmental Science & Technology, Guangzhou, 510650, P. R. China
*(D.Z.) E-mail: [email protected]
*(F.W.) E-mail: [email protected]
Cite this: Environ. Sci. Technol. 2017, 51, 21, 12663–12671
Publication Date (Web):October 9, 2017
https://doi.org/10.1021/acs.est.7b03705
Copyright © 2017 American Chemical Society
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Abstract

Disinfection is an indispensable process in wastewater treatment plants. New bacterial inactivation technologies are of increasing interest and persistent demand. A category of simple and efficient bactericidal systems have been established in this study, that is, the combination of divalent transition metal (Mn(II), Co(II), Fe(II), or Cu(II)) and sulfite. In these systems, metal catalyzed auto-oxidation of sulfite was manifested to generate reactive intermediary SO4•– that played the major role in Escherichia coli inactivation at pH 5–8.5. Increasing concentrations of metal ion or sulfite, and lower pH, led to higher bacterial deaths. Bacterial inactivation by Me(II)/sulfite systems was demonstrated to be a surface-bound oxidative damage process through destructing vital cellular components, such as NADH and proteins. Additionally, the developed Me(II)/sulfite systems also potently killed other microbial pathogens, that is, Pseudomonas aeruginosa, Bacillus subtilis, and Cu(II)-antibiotic-resistant E. coli. The efficacy of Me(II)/sulfite in treating real water samples was further tested with two sewages from a wastewater treatment plant and a natural lake water body, and Cu(II)/sulfite and Co(II)/sulfite rapidly inactivated viable bacteria regardless of bacteria species and cell density, therefore holding great promises for wastewater disinfection.

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