Investigating natural organic carbon removal and structural alteration induced by pulsed ultrasound

Al-Juboori, Raed A. and Yusaf, Talal and Aravinthan, Vasantha and Bowtell, Leslie (2016) Investigating natural organic carbon removal and structural alteration induced by pulsed ultrasound. Science of the Total Environment, 541. pp. 1019-1030. ISSN 0048-9697

Abstract

The application of pulsed ultrasound for DOC removal from natural water samples has been thoroughly investigated in this work. Natural water samples were treated with ultrasound at power levels of 48 and 84 W with treatment times of 5 and 15 min. Chemical fractionation was conducted for both untreated and treated samples to clearly identify the change in DOC structure caused by ultrasonic treatments. Statistical analyses applying 23 factorial design were performed to study the behaviour of the response (i.e. DOC removal) under different operating conditions. Overall, ultrasonic treatments resulted in DOC removal of 7–15% depending on the applied operating conditions. The treated water had high microbial loading that interferedwith DOC removal due primarily to the release of microbial productswhen exposed to ultrasound. Pulse ultrasound was found to bemore effective than the continuousmode for DOC removal at the same effective power level. A regression modelwas developed and tested for DOC removal prediction. The modelwas adequate in predicting DOC removal with a maximum deviation from the experimental data of <11%. Pulsed ultrasound at low power levels and short treatment times was found to be the most energy efficient treatment for DOC removal.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: 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 Mechanical and Electrical Engineering
Date Deposited: 04 Jul 2016 00:12
Last Modified: 20 Mar 2017 01:15
Uncontrolled Keywords: pulsed ultrasound; natural water; DOC; chemical fractionation; factorial design; microbial load
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090410 Water Treatment Processes
03 Chemical Sciences > 0305 Organic Chemistry > 030501 Free Radical Chemistry
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
09 Engineering > 0913 Mechanical Engineering > 091301 Acoustics and Noise Control (excl. Architectural Acoustics)
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
09 Engineering > 0906 Electrical and Electronic Engineering > 090699 Electrical and Electronic Engineering not elsewhere classified
Identification Number or DOI: 10.1016/j.scitotenv.2015.09.143
URI: http://eprints.usq.edu.au/id/eprint/28270

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