A kinetic study of ozone decay and bromine formation in saltwater ozonation: Effect of O3dose, salinity, pH, and temperature

Youmi Jung, Eunkyung Hong, Minhwan Kwon, Joonwun Kang

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Saltwater ozonation is used to remove invasive or pathogenic organisms from ballast water and water in the aquaculture industry. Ozone chemistry in saltwater is considerably different to that in freshwater. In saltwater, ozone rapidly decomposes to produce bromine, which is a main disinfectant in saltwater ozonation. It is very difficult to separate ozone and bromine in saltwater ozonation. In this study, we developed a model for prediction of residual ozone and bromine concentrations, and applied this model to calculate Ct value (Concentration of disinfectant × Contact time) for disinfection. The contributions of ozone-Ct and bromine-Ct to organism removal were studied using the zooplankton, Artemia salina. Interestingly, the removal efficiency of saltwater ozonation for A. salina (47%) was the same as the sum of the removal efficiencies for bromine (32%) and ozone (14%) used on their own. This indicates that both bromine and trace ozone kill A. salina during saltwater ozonation. The prediction model for residual ozone and bromine formation was verified in different ozone dose, water salinity, pH, and temperature, which affect ozone decomposition and bromine formation.

Original languageEnglish
Pages (from-to)30-38
Number of pages9
JournalChemical Engineering Journal
Volume312
DOIs
Publication statusPublished - 2017 Jan 1

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this