Assessing the application and downstream effects of pulsed mode ultrasound as a pre-treatment for alum coagulation

Al-Juboori, Raed A. and Aravinthan, Vasantha and Yusaf, Talal and Bowtell, Leslie (2016) Assessing the application and downstream effects of pulsed mode ultrasound as a pre-treatment for alum coagulation. Ultrasonics Sonochemistry, 31. pp. 7-19. ISSN 1350-4177

Abstract

The application of pulsed mode ultrasound (PMU) as a pre-treatment for alum coagulation was investigated at various alum dosages and pH levels. The effects of the treatments on turbidity and dissolved organic carbon (DOC) removal and residual Al were evaluated. Response surface methodology (RSM) was utilized to optimize the operating conditions of the applied treatments. The results showed that PMU pre-treatment increased turbidity and DOC removal percentages from maximum of 96.6% and 43% to 98.8% and 52%, respectively. It also helped decrease the minimum residual Al from 0.100 to 0.094 ppm. The multiple response optimization was carried out using the desirability function. A desirability value of >0.97 estimated respective turbidity removal, DOC removal and Al residual of 89.24%, 45.66% and ~0.1 ppm for coagulation (control) and 90.61%, >55% and ~0 for coagulation preceded by
PMU. These figures were validated via confirmatory experiments. PMU pre-treatment increased total coliform
removal from 80% to >98% and decreased trihalomethane formation potential (THMFP) from 250 to 200 ppb CH3Cl. Additionally, PMU application prior to coagulation improved the settleability of sludge due to the degassing effects. The results of this study confirms that PMU pre-treatment can significantly improve coagulation performance.


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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 Mechanical and Electrical Engineering
Date Deposited: 06 Apr 2016 04:43
Last Modified: 06 Apr 2016 04:43
Uncontrolled Keywords: pulsed mode ultrasound; coagulation response surface methodology (RSM); DOC removal; Al residual; downstream effects
Fields of Research : 03 Chemical Sciences > 0301 Analytical Chemistry > 030108 Separation Science
09 Engineering > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
09 Engineering > 0906 Electrical and Electronic Engineering > 090699 Electrical and Electronic Engineering not elsewhere classified
09 Engineering > 0913 Mechanical Engineering > 091301 Acoustics and Noise Control (excl. Architectural Acoustics)
Identification Number or DOI: 10.1016/j.ultsonch.2015.11.028
URI: http://eprints.usq.edu.au/id/eprint/28272

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