NDLI: Power source for inactivation of micro-organisms with partial high voltage discharge in a continuous process

Content Provider	IEEE Xplore Digital Library
Author	Creyghton, Y. Beurskens, R. Fiala, A. de Haan, S.W.H.
Copyright Year	2002
Description	Author affiliation: TNO Prins Maurits Lab., Rijswijk, Netherlands (Creyghton, Y.; Beurskens, R.; Fiala, A.)
Abstract	An electrical discharge technology is investigated as a nonthermal method for inactivation of microorganisms. Potential applications include treatment of drinking water (e.g. legionella) and liquid food pasteurization (e.g. fruit juices). A strong interest exists in mild food conservation processes without the loss of food quality that results from elevated temperatures. The electrical discharge method, alternatively named nonthermal plasma method, is investigated as one of the opportunities. Fast rising high voltage pulses have been applied to a corona electrode geometry producing filamentary, fast propagating discharges, called streamers. The energy per pulse is kept very low in order to prevent the thermal arcing phase. The presented research activities are directed to a better control and understanding of the discharge for a range of conditions (electrical, electrode geometry, process conditions). Different pulse shapes and treatment chambers have been applied to achieve a uniform treatment of continuous liquid flow. The paper presents a parameter study of the electrical circuit, simulated electrical field conditions and microbiological test results. A 6 log inactivation of Lactobacillus Plantarum in a 0.1 S/m phosphate buffer with pH = 5.5, has been demonstrated under continuous flow conditions with 14 degrees temperature increase. However, the inactivation of spores (Bacillus subtilis) after treatment in the discharge chamber, has not been observed.
Sponsorship	Electron Devices Soc. & Dielectrics & Electron Insulation Soc. IEEE
Starting Page	657
Ending Page	661
File Size	348511
Page Count	5
File Format	PDF
ISBN	0780375408
ISSN	10768467
DOI	10.1109/MODSYM.2002.1189563
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-06-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Fault location Plasma temperature Electrodes Geometry Circuit testing Food technology Microorganisms Water conservation Plasma applications
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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