Synergistic effect of sequential or combined use of ozone and UV radiation for the disinfection of Bacillus subtilis spores

Yeon Jung Jung, Byung Soo Oh, Joon Wun Kang

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

This study was performed to evaluate the inactivation efficiency or synergy of combined ozone and UV processes (combined ozone/UV process) or sequential processes (ozone-UV, UV-ozone) compared with individual unit processes and to investigate the specific roles of ozone, UV and the hydroxyl radical, which is formed as an intermediate in the combined ozone/UV process. The Bacillus subtilis spore, which has often been used as a surrogate microorganism for Cryptosporidium parvum oocysts, was used as a target microorganism. Compared to individual unit processes with ozone or UV, the inactivation of B. subtilis spores by the combined ozone/UV process was enhanced under identical conditions. To investigate the specific roles of ozone and UV in the combined ozone/UV process, sequential ozone-UV and UV-ozone processes were tested for degrees of inactivation. Additionally, the experiment was performed in the presence and absence of tert-butyl alcohol, which acted as a hydroxyl radical scavenger to assess the role of inactivation by the hydroxyl radical in the combined ozone/UV process. Among the five candidate processes, the greatest synergistic effect was observed in the combined ozone/UV process. From the comparison of five candidate processes, the hydroxyl radical and ozone were each determined to significantly enhance the overall inactivation efficiency in the combined ozone/UV process.

Original languageEnglish
Pages (from-to)1613-1621
Number of pages9
JournalWater Research
Volume42
Issue number6-7
DOIs
Publication statusPublished - 2008 Mar 1

Fingerprint

Disinfection
Bacilli
Ultraviolet radiation
disinfection
Ozone
spore
ozone
hydroxyl radical
radiation
effect
Microorganisms
Chemical reactions
microorganism
scavenger

All Science Journal Classification (ASJC) codes

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

Cite this

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Synergistic effect of sequential or combined use of ozone and UV radiation for the disinfection of Bacillus subtilis spores. / Jung, Yeon Jung; Oh, Byung Soo; Kang, Joon Wun.

In: Water Research, Vol. 42, No. 6-7, 01.03.2008, p. 1613-1621.

Research output: Contribution to journalArticle

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