Oxidation and bio-decontamination effects of impulsive discharges in atmospheric air

Li, Sirui and Timoshkin, Igor V. and MacLean, Michelle and MacGregor, Scott J. and Wilson, Mark P. and Given, Martin J. and Wang, Tao and Anderson, John G. (2016) Oxidation and bio-decontamination effects of impulsive discharges in atmospheric air. IEEE Transactions on Plasma Science, 44 (10). pp. 2145-2155. ISSN 1939-9375 (https://doi.org/10.1109/TPS.2016.2581317)

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Abstract

Chemical oxidation and the bactericidal capabilities of non-thermal plasma discharges can be used in different practical applications such as bio-decontamination, sterilisation of medical equipment, waste water treatment, syn-gas treatment and others. In this paper, the oxidation and bio-decontamination effects of impulsive plasma discharges which propagate across a liquid sample/air interface (surface discharges), and through the bulk of a liquid sample (direct discharges), have been investigated. The oxidising capability was analysed by measuring the degree of decolourisation of indigo carmine dye in water solutions. Gram-negative and Gram-positive bacteria, E. coli and S. aureus, respectively, were used as model microorganisms in the investigation of the biocidal effects of plasma discharges. Surface and direct plasma discharges were generated by high-voltage impulses of both polarities, with magnitudes of 20 kV, 24 kV and 28 kV, the chemical oxidation and bio-decontamination capabilities of such discharges have been obtained and analysed. It has been established that the defining factor in the chemical and biological effects of plasma discharges is the normalised delivered charge (dose). The results obtained in this study show that surface discharges have greater bio-decontamination capability as compared with direct transient plasma discharges. Also, it was shown that the decontamination rate of E.coli is more than double than that of S. aureus.

ORCID iDs

Li, Sirui ORCID logoORCID: https://orcid.org/0000-0002-2267-4335, Timoshkin, Igor V. ORCID logoORCID: https://orcid.org/0000-0002-0380-9003, MacLean, Michelle ORCID logoORCID: https://orcid.org/0000-0001-5750-0397, MacGregor, Scott J. ORCID logoORCID: https://orcid.org/0000-0002-0808-585X, Wilson, Mark P. ORCID logoORCID: https://orcid.org/0000-0003-3088-8541, Given, Martin J. ORCID logoORCID: https://orcid.org/0000-0002-6354-2486, Wang, Tao ORCID logoORCID: https://orcid.org/0000-0003-3054-0772 and Anderson, John G. ORCID logoORCID: https://orcid.org/0000-0003-4151-1619;
  • Item type:Article
    ID code:56945
    Dates:
    Date
    Event
    31 October 2016
    Published
    24 June 2016
    Published Online
    6 June 2016
    Accepted
    Notes:Published as part of a special issue, "Pulsed Power Science & Technology". (c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:12 Jul 2016 12:47
    Last modified:24 Nov 2024 01:12
    URI:https://strathprints.strath.ac.uk/id/eprint/56945
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