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Inactivation of Escherichia coli by pulsed corona discharge in liquid environment
Vykouk, T. ; Člupek, Martin ; Lukeš, Petr
Although common techniques of water and wastewater treatment are well established, potential for new methods to improve the quality and effectiveness of water purification processing is still high. Among a number of methods that are under development, the pulsed corona discharge in water represents a promising alternative approach of chemical and biological decontamination of water. In this work the effects of corona discharge in water on bacteria Escherichia coli has been investigated. The contribution of UV radiation and hydrogen peroxide in the overall bacterial inactivation efficiency of the discharge was determined.
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Prodlužovač impulsů s vysokou spektrální a výkonovou propustností
Divoký, M. ; Smrž, M. ; Straka, Petr
We present a pulse stretcher based on modified Öffner triplet using an off-plane (conical) diffraction under the Littrow configuration. Our system was ray-traced and the results are comparable with a similar design using in-plane diffraction. A slight conical diffraction is not a serious problem which was demonstrated by stretching the 10-fs pulses from a Ti:sapphire laser to ~300 ps and backcompressing them to 16 fs with a high power throughput over the system and low distortion of the pulses.
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Hygienizační účinky impulsních korónových výbojů ve vodním prostředí
Vykouk, T. ; Člupek, Martin ; Lukeš, Petr
In recent years, several types of reactors (point-plate, composite wire-cylinder, diaphragm-cylinder) to generate pulsed corona discharges in water have been developed at the Institute of Plasma Physics of the Academy of Sciences of the Czech Republic. Plasmochemical effects of these discharges on removal of organic pollutants from aqueous solutions have been studied. The effects of corona discharges on microorganisms in water are investigated in cooperation with the Department of Water Technology and Environmental Engineering of the Institute of Chemical Technology, Prague. In this work the results of the effects of corona discharge in water generated in pinhole reactor on viability of aqueous suspensions of algae Chlorella vulgaris, Desmodesmus qudricauda, bacterial culture of Enterococcus faecalis, and the mixture of thermophilic bacterias in activated sludge from biological wastewater treatment plant, are presented.
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Measurements on Hot Gas Mixture Free Jet
Gregor, Jan ; Jakubová, I. ; Mendl, Tomáš ; Šenk, J. ; Sember, Viktor
The measurements of temperature, velocity and composition of the free jet generated by a hybrid water-argon torch "cold" part of the jet (T<2500K) are presented.Parameters of the jet at the torch output are calculated by the continuity and energy equations using the spectroscopicaly measured temperature distribution.Temperature and velocity fields are measured respecively by thermo.
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