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Rapid inactivation of waterborne bacteria using boron-doped diamond electrodes

  • C. HeimEmail author
  • M. Ureña de Vivanco
  • M. Rajab
  • E. Müller
  • T. Letzel
  • B. Helmreich
Original Paper

Abstract

The application of a boron-doped diamond electrode in electrochemical water disinfection was investigated with respect to its inactivation potential of three indicator microorganisms. Drinking water and the effluent of a wastewater treatment plant spiked with Escherichia coli, Enterococcus faecium and Pseudomonas aeruginosa were electrolysed under different conditions in a batch reactor. All three bacteria species could be successfully inactivated in drinking water. The disinfection rate depended on the applied charge, with far more efficiency at high current densities (208 and 333 mA/cm2) under high ozone concentrations measured in contrast to low current densities (42 mA/cm2) where bacterial inactivation was rather driven by hydroxyl radicals. When oxidising a target pharmaceutical compound in the wastewater treatment plant effluent, the water matrix exhibited an ozone scavenging effect. The resulting decrease in the efficiency could not be detected for the disinfection experiments in the complex water matrix compared to drinking water, which indicates a different disinfection mechanism, probably due to reactive chlorine species.

Keywords

Electrochemical oxidation Diamond electrode Water disinfection Enterococcus faecium Escherichia coli Pseudomonas aeruginosa 

Notes

Acknowledgments

This research was supported by the Federal Ministry of Education and Research of Germany (03X0087G). The authors want to thank the Institute of Microbial Ecology, Technische Universität München, for their support with the bacteria cultures.

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Copyright information

© Islamic Azad University (IAU) 2014

Authors and Affiliations

  • C. Heim
    • 1
    Email author
  • M. Ureña de Vivanco
    • 1
  • M. Rajab
    • 1
  • E. Müller
    • 1
  • T. Letzel
    • 1
  • B. Helmreich
    • 1
  1. 1.Chair of Urban Water Systems EngineeringTechnische Universität MünchenGarchingGermany

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