Erlangen 2018 – scientific programme

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P: Fachverband Plasmaphysik

P 4: Atmospheric Pressure Plasmas I

P 4.4: Talk

Monday, March 5, 2018, 15:00–15:15, KI 1.174

Parameters of Streamer Development for Nanosecond High Voltage Discharges in Water — •Jana Kredl, Tilo Schulz, and Juergen F. Kolb — Leibniz Institute for Plasma Science and Technology e.V. (INP Greifswald), Felix-Hausdorff-Str. 2, 17489 Greifswald

More and more drinking water is contaminated by an increasing concentration of pharmaceuticals. Although, concentrations are well below medical significant doses, environmental impacts, e.g. on fish populations, have already been observed. High voltage nanosecond discharges can be used to decontaminate waste water and degrade pharmaceutical residues in drinking water. Streamer that are generated provide in particular a strong reactive chemistry for degradation and decontamination. It is not clear yet how these streamers are created and determine the reactive chemistry. Thus, it is examined how streamer lengths and densities depend on the experimental parameters, i.e. applied voltage, pulse length, water conductance and discharge geometry. Therefore, a coaxial electrode arrangement is used. The inner electrode is a tungsten wire with 0.05 mm in diameter and the outer electrode is an iron mesh. The reactor itself is made of glass for optical access. The applied voltage is supplied by a self-made Blumlein-line pulse generator, which delivers square pulses in the nanosecond-range.