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Peracetic acid-enhanced photocatalytic and sonophotocatalytic inactivation of E. coli in aqueous suspensions

✍ Scribed by Catherine Drosou; Alberto Coz; Nikolaos P. Xekoukoulotakis; Armando Moya; Yolanda Vergara; Dionissios Mantzavinos

Publisher: Wiley (John Wiley & Sons)
Year: 2010
Tongue: English
Weight: 106 KB
Volume: 85
Category: Article
ISSN: 0268-2575
DOI: 10.1002/jctb.2396

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✦ Synopsis

Abstract

BACKGROUND: Although chlorination is an effective and widely employed method of water disinfection, it suffers serious drawbacks such as the formation of toxic chlorinated by‐products. Therefore, other disinfection technologies have been researched and developed, including advanced oxidation.

RESULTS: The efficacy of heterogeneous photocatalysis and sonophotocatalysis induced by UV‐A irradiation and low frequency (24–80 kHz) ultrasound irradiation in the presence of TiO~2~ as the photocatalyst and peracetic acid (PAA) as an additional disinfectant to inactivate E. coli in sterile water was evaluated. PAA‐assisted UV‐A/TiO~2~ photocatalysis generally leads to nearly complete E. coli inactivation in 10–20 min of contact time with the extent of inactivation depending on the photocatalyst type and loading (in the range 100–500 mg L^−1^) and PAA concentration (in the range 0.5–2 mg L^−1^). The simultaneous application of ultrasound and UV‐A irradiation in the presence of TiO~2~ and PAA prompted further E. coli inactivation.

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