A low-energy intensive electrochemical system for the eradication of Escherichia coli from ballast water: Process development, disinfection chemistry, and kinetics modeling

K. G. Nadeeshani Nanayakkara, A. K.M. Khorshed Alam, Yu Ming Zheng*, J. Paul Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The invasion of biological organisms via ballast water has created threats to the environment and human health. In this study, a cost-effective electrochemical disinfection reactor was developed to inactivate Escherichia coli, one of the IMO-regulated indicator microbes, in simulated ballast water. The complete inactivation of E. coli could be achieved within a very short time (150, 120, or 60s) with an energy consumption as low as 0.0090, 0.0074 or 0.0035kWh/m 3 for ballast water containing E. coli at concentrations of 10 8, 10 7 and 10 6CFU/100mL, respectively. Electrochemical chlorination was the major disinfection mechanism in chloride-abundant electrolytes, whereas oxidants such as ozone and free radicals contributed to 20% of the disinfection efficiency in chloride-free electrolytes. Moreover, a disinfection kinetics model was successfully developed to describe the inactivation of E. coli.

Original languageEnglish
Pages (from-to)1238-1245
Number of pages8
JournalMarine Pollution Bulletin
Volume64
Issue number6
DOIs
StatePublished - Jun 2012
Externally publishedYes

Keywords

  • Ballast water
  • E. coli
  • Electrochemical disinfection
  • Kinetics modeling

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