Study Of Decolorization Process With The Non-thermal Plasma

The manpower complex organic dyestuff is applied widely to the modern weave industry and printing and dyeing industry. Not only the waste water that produced by them have potential organism toxicity, but also it will debase the visibility of water. Therefore the decolorization of the dyestuff water has become the advertent problem of environment protection. The dielectric barrier discharge (DBD) is applied to making ozone, treating surface of polymer, sterilization degradation of volatile organic matter, because the DBD has the advantage of simple configuration and operation. The decoloration effect of indigo carmine aqueous solution with the non-thermal plasma from the spraying dielectric barrier discharge (DBD) system was investigated in this paper. The results obtained from the concentration of the dye shown that:(1) After the high-voltage was applied to the high-voltage electrodes, the water electrode was started to atomize under the process of the electric field, and the spraying dielectric barrier discharge was formed finally. This phenomenon produced strongly discharge region and created a mass of non-thermal plasma active species. (2) The concentration of the dye decreased with the increase in applied high voltage and the decrease in air gaps under the same treatment time. When the air gap was 30mm, and the voltage was 30kV, the concentration of the dye had got to 0.085×10-5mol/l after 30 minutes, and the dye had almost no color. The effect of the decoloration was very salience. (3)The size of the droplets is much smaller for air gaps 20mm under the same external conditions. The state of the atomization went well when the air gap was smaller and the voltage was higher, a great deal of fog drops with smaller size were formed and this would be propitious to oxidize and decompose the dye molecule. But little distance provide a small atomization space which is also not favorable for the atomization.