Disinfection of Bacteria in Water by Capacitive Deionization

Karthik Laxman, Priyanka Sathe, Mohammed Al Abri, Sergey Dobretsov, Joydeep Dutta*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Clean water is one of the primary UN sustainable development goals for 2,030 and sustainable water deionization and disinfection is the backbone of that goal. Capacitive deionization (CDI) is an upcoming technique for water deionization and has shown substantial promise for large scale commercialization. In this study, activated carbon cloth (ACC) electrode based CDI devices are used to study the removal of ionic contaminants in water and the effect of ion concentrations on the electrosorption and disinfection functions of the CDI device for mixed microbial communities in groundwater and a model bacterial strain Escherichia coli. Up to 75 % of microbial cells could be removed in a single pass through the CDI unit for both synthetic and groundwater, while maintaining the salt removal activity. Mortality of the microbial cells were also observed during the CDI cell regeneration and correlated with the chloride ion concentrations. The power consumption and salt removal capacity in the presence and absence of salt were mapped and shown to be as low as 0.1 kWh m−3 and 9.5 mg g−1, respectively. The results indicate that CDI could be a viable option for single step deionization and microbial disinfection of brackish water.

Original languageEnglish
Article number774
JournalFrontiers in Chemistry
Volume8
DOIs
Publication statusPublished - Aug 31 2020
Externally publishedYes

Keywords

  • antibacterial
  • capacitive deionization
  • desalination
  • disinfection
  • water treatment

ASJC Scopus subject areas

  • Chemistry(all)

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