Numerical and experimental investigation of acetic acid decomposition by a nano-pulse discharged bubble in water

Y. He, S. Uehara, H. Takana, Hideya Nishiyama

Research output: Contribution to journalArticle

Abstract

Nano-pulse discharges in bubbles are regarded as an efficient method to generate plasma for decomposition of persistent organic pollutants (POPs) in water. In this study, decomposition experiments of acetic acid solution by multiple nano-pulse discharged bubbles were firstly conducted for different voltages and frequencies under the same input power. It is found that the concentration of acetic acid solution decreased most for lower applied voltage and higher frequency. Moreover, a two-dimensional r-θ numerical model was constructed to investigate the decomposition characteristics of acetic acid by a nano-pulse discharged bubble. Hydroxyl radicals (· OH) with high oxidation potential were generated in bubbles to decompose POPs. They were found to be able to diffuse through the bubble interface to several micrometers in water. The results showed that acetic acid were decomposed by OH radicals. The average decomposition rate was dependent on the water layer thickness. It is also found that for a given input power, acetic acid were mostly decomposed for lower applied voltage and higher frequency. The numerical results showed qualitative consistency with the experimental results.

Original languageEnglish
Pages (from-to)30-36
Number of pages7
JournalInternational Journal of Plasma Environmental Science and Technology
Volume12
Issue number1
Publication statusPublished - 2018 Jun 1

Keywords

  • Acetic acid decomposition
  • Hydroxyl radicals
  • Nano-pulse discharged bubble
  • Water treatment

ASJC Scopus subject areas

  • Environmental Science(all)

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