Feasibility study of ultrasound as water disinfection technology

This article presents a section of project work related to the use of ultrasound technology as an eco-friendly water disinfection process. Scientific and economical evaluations are presented for two different ultrasound systems. The effects of ultrasound frequencies (20, 279 and 817 kHz), amplitude...

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Bibliographic Details
Published in:Desalination and water treatment 2015-07, Vol.55 (5), p.1393-1399
Main Authors: Vajnhandl, Simona, Željko, Tina, Majcen Le Marechal, Alenka, Valh, Julija Volmajer
Format: Article
Language:English
Subjects:
Bacillus subtilis
Bacteria
Disinfection
E coli
Escherichia coli
Feasibility studies
Microbiology
Ultrasound
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Summary:This article presents a section of project work related to the use of ultrasound technology as an eco-friendly water disinfection process. Scientific and economical evaluations are presented for two different ultrasound systems. The effects of ultrasound frequencies (20, 279 and 817 kHz), amplitude (acoustic power) and the treatment time for bacteria survival were studied. Experiments performed on a laboratory scale using two biological indicator micro-organisms Bacillus subtilis and Escherichia coli indicated that disinfection efficiency is affected by bacteria morphology, ultrasound frequencies and energy densities entering the system. As the spore-forming bacteria B. subtilis seemed less vulnerable to ultrasound exposure, a significant E. coli inhibition of 2.97±0.58 log was achieved in 5 min treatment time at 817 kHz.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2014.927331