Photocatalytic inactivation of Cryptosporidium parvum with TiO2 and low-pressure ultraviolet irradiation

Hodon Ryu, Daniel Gerrity, John C. Crittenden, Morteza Abbaszadegan

Research output: Contribution to journalArticle

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Abstract

This study investigated the efficacy of low-pressure ultraviolet (UV) irradiation and the synergistic effect of UV/titanium dioxide (TiO2) photocatalysis on Cryptosporidium parvum oocyst inactivation. At UV doses of 2.7, 8.0, and 40 mJ/cm2, oocyst inactivation was 1.3, 2.6, and 3.3 log10, respectively. Reactive oxygen species (ROS) generated by longwave UV radiation (>315 nm) and TiO2 achieved less than 0.28-log inactivation. However, the synergistic effect of germicidal (254 nm) UV and TiO2 resulted in 2-log and 3-log oocyst inactivation with 4.0 and 11.0 mJ/cm2, respectively. Therefore, using TiO2 in combination with UV reduced the dose requirement for 3-log inactivation by 56%. An approximate 1-log decrease in inactivation of oocysts was observed with nanopure water in comparison to buffered water, whereas changes in pH from 6 to 8 had little effect on the photocatalytic inactivation of oocysts in either matrix (P>0.1).

Original languageEnglish (US)
Pages (from-to)1523-1530
Number of pages8
JournalWater Research
Volume42
Issue number6-7
DOIs
StatePublished - Mar 2008

Fingerprint

low pressure
irradiation
Irradiation
Photocatalysis
Ultraviolet radiation
Titanium dioxide
Water
ultraviolet radiation
Oxygen
water
matrix
effect
dose
reactive oxygen species
comparison
titanium dioxide

Keywords

  • Cryptosporidium inactivation
  • Integrated cell culture quantitative PCR
  • UV/TiO photocatalysis

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Photocatalytic inactivation of Cryptosporidium parvum with TiO2 and low-pressure ultraviolet irradiation. / Ryu, Hodon; Gerrity, Daniel; Crittenden, John C.; Abbaszadegan, Morteza.

In: Water Research, Vol. 42, No. 6-7, 03.2008, p. 1523-1530.

Research output: Contribution to journalArticle

Ryu, Hodon ; Gerrity, Daniel ; Crittenden, John C. ; Abbaszadegan, Morteza. / Photocatalytic inactivation of Cryptosporidium parvum with TiO2 and low-pressure ultraviolet irradiation. In: Water Research. 2008 ; Vol. 42, No. 6-7. pp. 1523-1530.
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