Deactivation of Legionella Pneumophila in municipal wastewater by ozone generated in arrays of microchannel plasmas

Shengkun Dong, Jun Li, Min Hwan Kim, Jinhoon Cho, Sung Jin Park, Thanh H. Nguyen, J. Gary Eden

Research output: Contribution to journalArticlepeer-review


A greater than four log10 reduction in the concentration of Legionella pneumophila in municipal wastewater has been achieved in 1 min with ozone produced by a microchannel plasma reactor. Requiring less than 22 W of electrical power, and ambient air as the feedstock gas, the microplasma ozone generator is robust and a promising alternative to conventional corona and dielectric barrier discharge (DBD) technologies. Contrary to previous studies, the Ct model for pathogen deactivation (i.e. rate proportional to the product of the available disinfectant concentration and the exposure duration) is found to be valid for L. pneumophila. Accordingly, wastewater-specific Ct equations have been developed to predict the deactivation of L. pneumophila in the secondary wastewater environment. Inactivation of this pathogen was found to be dependent on temperature only in the absence of wastewater organic matter (WOM). In the presence of WOM, pathogen deactivation is controlled by the disinfection contact time, initial ozone concentration (varied between 15 and 281 μg l-1), and initial WOM loading. The data reported here will assist in the implementation of plasma ozone generators for L. pneumophila deactivation in cooling towers, point-of-use systems, and wastewater reclamation facilities.

Original languageEnglish (US)
Article number255501
JournalJournal of Physics D: Applied Physics
Issue number25
StatePublished - Jun 1 2018


  • Legionella pneumophila
  • microchannel plasma
  • microplasma
  • ozone reactor
  • waste water

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


Dive into the research topics of 'Deactivation of Legionella Pneumophila in municipal wastewater by ozone generated in arrays of microchannel plasmas'. Together they form a unique fingerprint.

Cite this