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

被引：44

作者：

Ryu, Hodon ^{[1
]}

Gerrity, Daniel ^{[1
]}

Crittenden, John C. ^{[1
]}

Abbaszadegan, Morteza ^{[1
]}

机构：

[1] Arizona State Univ, Natl Sci Fdn, Water Qual Ctr, Dept Civil & Environm Engn, Tempe, AZ 85287 USA

来源：

WATER RESEARCH | 2008年 / 42卷 / 6-7期

基金：

美国国家科学基金会;

关键词：

Cryptosporidium inactivation; UV/TiO2; photocatalysis; integrated cell culture quantitative PCR;

D O I：

10.1016/j.watres.2007.10.037

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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/cm(2), oocyst inactivation was 1.3, 2.6, and 3.3log(10), 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/cm(2), 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). (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1523 / 1530

页数：8

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