Rapid Inactivation of Airborne Bacteria Using Atmospheric Pressure Dielectric Barrier Grating Discharge

Dielectric barrier discharge plasma has been known to inactivate many different microorganisms on surfaces when treatment times are on the order of seconds or minutes in duration. In this paper, a unique plasma air cleaning facility was created which combines a dielectric barrier grating discharge (...

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Bibliographic Details
Published in:	IEEE transactions on plasma science 2007-10, Vol.35 (5), p.1501-1510
Main Authors:	Gallagher, M.J., Vaze, N., Gangoli, S., Vasilets, V.N., Gutsol, A.F., Milovanova, T.N., Anandan, S., Murasko, D.M., Fridman, A.A.
Format:	Article
Language:	eng
Subjects:	Air cleaners Air flow air sterilization Airborne microorganism Atmospheric-pressure plasmas Bacteria Barriers Devices dielectric barrier discharge Dielectric properties Dielectrics Discharge E coli Electric discharges Electrical equipment Escherichia coli Exact sciences and technology Gratings Inactivation Laboratories Microorganisms nonthermal plasma Other gas discharges Physics Physics of gases, plasmas and electric discharges Physics of plasmas and electric discharges Plasma Plasma devices Reduction Surface discharges Surface treatment Ventilation
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Summary:	Dielectric barrier discharge plasma has been known to inactivate many different microorganisms on surfaces when treatment times are on the order of seconds or minutes in duration. In this paper, a unique plasma air cleaning facility was created which combines a dielectric barrier grating discharge (DBGD) with a filterless laboratory-scale ventilation system and is used to treat concentrated bacterial bioaerosol in a moving air stream at air flow rates of 25 L/s. Results indicate that plasma treatment times on the order of milliseconds corresponding to one pass through the DBGD device can achieve 1.5-log reduction in culturable E. coli immediately after contact with plasma and 5-log reduction totally following in the minutes after the plasma treatment. A numerical characterization study was performed to help predict and understand the mechanism of bacteria inactivation in the DBD plasma from a variety of plasma factors.
ISSN:	0093-3813 1939-9375