Impact of pulsed ultrasound on bacteria reduction of natural waters

Al-Juboori, Raed A. and Aravinthan, Vasantha and Yusaf, Talal (2015) Impact of pulsed ultrasound on bacteria reduction of natural waters. Ultrasonics Sonochemistry, 27. pp. 137-147. ISSN 1350-4177

Abstract

There is a limited work on the use of pulsed ultrasound for water disinfection particularly the case of natural water. Hence, pulsed ultrasound disinfection of natural water was thoroughly investigated in this study along with continuous ultrasound as a standard for comparison. Total coliform measurements were applied to evaluate treatment efficiency. Factorial design of 23 for the tested experimental factors such as power, treatment time and operational mode was applied. Two levels of power with 40% and 70% amplitudes, treatment time of 5 and 15 min and operational modes of continuous and pulsed with On to Off ratio (R) of 0.1:0.6 s were investigated. Results showed that increasing power and treatment time or both increases total coliform reduction, whereas switching from continuous to pulsed mode in combination with power and treatment time has negative effect on total coliform reduction. A regression
model for predicting total coliform reduction under different operating conditions was developed and
validated. Energy and cost analyses applying electrical and calorimetric powers were conducted to serve as selection guidelines for the choosing optimum parameters of ultrasound disinfection. The outcome of these analyses indicated that low power level, short treatment time, and high R ratios are the most effective operating parameters.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 02 Jun 2015 02:15
Last Modified: 30 Jun 2016 04:19
Uncontrolled Keywords: pulsed ultrasound; total coliform; microbial reduction; natural water; energy and cost
Fields of Research : 10 Technology > 1003 Industrial Biotechnology > 100305 Industrial Microbiology (incl. Biofeedstocks)
03 Chemical Sciences > 0302 Inorganic Chemistry > 030203 Inorganic Green Chemistry
Identification Number or DOI: 10.1016/j.ultsonch.2015.05.007
URI: http://eprints.usq.edu.au/id/eprint/27412

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