Improving the performance of ultrasonic horn reactor for deactivating microorganisms in water

Al-Juboori, R. A. and Yusaf, T. F. (2012) Improving the performance of ultrasonic horn reactor for deactivating microorganisms in water. IOP Conference Series: Materials Science and Engineering, 36 (012037). ISSN 1757-899X

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Abstract

The research on enhancing the performance of ultrasonic reactor for the purpose of microorganisms' inactivation is still ongoing. In this work, covering the cavitation chamber bottom with a corrugated surface as a source for heterogeneous cavities has been proposed as a simple modification to improve ultrasonic deactivation for ultrasonic horn reactor. Escherichia coli ATCC 25922 was used as a model microorganism in this study. Before using the corrugated surface, the configuration of the cavitation chamber was optimized experimentally in regards to cavitation chamber diameter and the depth of ultrasonic probe tip in the suspension. The optimization of the aforementioned factors was conducted on a basis of using constant suspension volume of 50ml. The depth of the ultrasonic probe tip in the suspension was changed from 2-10mm with a step of 2mm in overall depth of the suspension of 2cm, while the diameter of the chamber was changed using five Pyrex beakers with different diameters. The study was carried out using three level of ultrasonic intensity; low (17.56), intermediate (21.49) and high (24.17) W/cm2. The results of the optimization showed that increasing the diameter of cavitation chamber can decrease the log reduction of E.coli significantly. However, changing the depth of ultrasound probe in the suspension within the studied range was found to have only slight effect on the log reduction of E.coli in the order of approximately 0.5-log10. When using the corrugated surface with optimum chamber design, the results revealed that the corrugated surface can increase the log reduction of E.coli for the applied ultrasonic intensities. This effect was more discernable with low ultrasonic intensity than intermediate and high intensities.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Originally presented at ICMER 2011: 1st International Conference of Mechanical Engineering Research , 5-7 Dec 2011, Kuantan, Malaysia. Deposited in accordance with the copyright policy of the publisher (Institute of Physics) For details see http://authors.iop.org/atom/help.nsf/0/F20EC7D4A1A670AA80256F1C0053EEFF?OpenDocument
Depositing User: Mr Raed Ahmed Mahmood
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 19 Jan 2012 02:35
Last Modified: 26 Aug 2014 21:34
Uncontrolled Keywords: ultrasonic horn reactor; Escherichia coli ATCC 25922; corrugated surface; heterogeneous cavitation
Fields of Research (FOR2008): 05 Environmental Sciences > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified
09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
09 Engineering > 0904 Chemical Engineering > 090410 Water Treatment Processes
03 Chemical Sciences > 0399 Other Chemical Sciences > 039901 Environmental Chemistry (incl. Atmospheric Chemistry)
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Identification Number or DOI: 10.1088/1757-899X/36/1/012037
URI: http://eprints.usq.edu.au/id/eprint/20459

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