Kenji Teranishi

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Industrial application of pulsed power for water treatment has several advantages. Electrical discharges produced in atmosphere involve a variety of high energy phenomena which might be effective for water treatment. A water treatment system consisting of a coaxial cylinder reactor was constructed. The reactor consisted of a wire inner electrode and an(More)
Water treatment is one of the industrial applications taking advantage of pulsed power. Electrical discharges produced in atmosphere involve a variety of high energy phenomena, which would be effective to the water treatment. The water treatment system consisting of coaxial cylinder reactor was constructed. The reactor consists of an inner electrode of a(More)
A pulsed power generator with a nanosecond pulsewidth has been developed and applied to ozone production. Coaxial reactors connected in parallel are used in the experiment. The system ozone production yield, which is evaluated from the initial energy in the primary storage capacitors, is approximately 190 g/kWmiddoth when dry oxygen is used as the(More)
Nitrogen oxides (NOx) are one of the air pollutants that cause acid rain. Although utilization of catalysts is a typical established method of treatment to remove NOx, the catalyst is expensive so that the total cost of treatment is high. The efficient treatments using pulsed power, which utilize the pulse streamer discharges, have been studied. We have(More)
In ozone production using streamer discharges by pulsed power, the concentration of ozone is not high although ozone is produced with high efficiency. To improve ozone concentration, we studied the effects of electrode separation in a coaxial reactor using nanosecond pulsed power. We found that ozone concentration and yield increase with decreasing inside(More)
Nanosecond pulsed powers produce streamer discharges which are suitable for chemical reactions. The discharges in wire-plate electrodes and wire-cylinder electrodes are observed. The dense area where streamers exist should be utilized as a high-performance reactor. Widely distributed streamer discharges were observed. On the other hand, spark discharges,(More)
In this paper, we show images of pulsed discharges in helium and nitrogen bubbles in humate solution. The characteristics of the pulsed discharges in the solution depend on the gas atoms and molecules, the configuration of bubbles in the solution, and the gap length between the bubbles. The colors of the discharge emitted from helium and nitrogen bubbles(More)
In using pulsed power, although ozone is produced with high efficiency, the concentration of ozone is not high. Introduction of reactor coupled with a capacitor and use of nanosecond pulsed power transmission technique is considered to improve the ozone concentration. The reactor coupled with a capacitor can suppress incidence of spark discharges between(More)
Water Pollution is one of nontrivial environment issues around the world. Consumption of surfactants instead of organic solvent has increased for industrial and domestic usages, but the surfactants have environmental load. We have studied a water treatment using nanosecond pulsed powers. Discharge plasmas generated by the nanosecond pulsed powers(More)
Water pollution is a major environmental issue around the world. We have studied water treatment using nanosecond pulsed power. Discharge plasmas generated by the nanosecond pulsed power efficiently produce active species that are applicable to water treatments. In this study, device with a dielectric barrier was compared with that without a dielectric(More)