Journal
NPJ BIOFILMS AND MICROBIOMES
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41522-018-0063-4
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Funding
- U.S. Environmental Protection Agency EPA [RD-83487001]
- U.S. Air Force Office of Scientific Research [FA9550-14-1-0002]
- National Institutes of Health [R01EB013723]
- NATIONAL INSTITUTE OF BIOMEDICAL IMAGING AND BIOENGINEERING [R01EB013723] Funding Source: NIH RePORTER
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Biofilms exist and thrive within drinking water distribution networks, and can present human health concerns. Exposure of simulated drinking water biofilms, grown from groundwater, to a 9 x 9 array of microchannel plasma jets has the effect of severely eroding the biofilm and deactivating the organisms they harbor. In-situ measurements of biofilm structure and thickness with an optical coherence tomography (OCT) system show the biofilm thickness to fall from 122 +/- 17 mu m to 55 +/- 13 mu m after 15 min. of exposure of the biofilm to the microplasma column array, when the plasmas are dissipating a power density of 58 W/cm(2). All biofilms investigated vanish with 20 min. of exposure. Confocal laser scanning microscopy (CLSM) demonstrates that the number of living cells in the biofilms declines by more than 93% with 15 min. of biofilm exposure to the plasma arrays. Concentrations of several oxygen-bearing species, generated by the plasma array, were found to be 0.4-21 mu M/s for the hydroxyl radical (OH), 85-396 mu M/s for the O-1(2) excited molecule, 98-280 mu M for H2O2, and 24-42 mu M for 0 3 when the power density delivered to the array was varied between 3.6 W/cm(2) and 79 W/cm(2). The data presented here demonstrate the potential of microplasma arrays as a tool for controlling, through non-thermal disruption and removal, mixed-species biofilms prevalent in commercial and residential water systems.
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