Investigation On Degradation Of Organic Dyes Wastewater By Gas Phase Surface Discharge Plasma Using Liquid Electrode

In this paper, degradation of organic dyes by active species sprayed in a gas phase surface discharge (GPSD) system using water ground electrode is studied. Two types of reactor system, including a traditional ozone generator water treatment system as compare and a new type of all-in-one discharge water treatment reactor which using the cooling water as ground electrode, are provided for degradation of dyes. Some influencing factors of the technology and mechanism of dye degradation are investigated, which are expected to provide the reference for further research and industrialization. The main results are summarized as follows:1.By investigating the affect of ground electrodes and ozone transmission pipe on the ozone concentration and dye degradation, it's found that a effective reduction of ozone loss in transmission and a increase of 32.7% energy utilization efficiency of dye romoval will be get using the all-in-one GPSD reactor with water ground electrode.2.The optimum condition parameters matching with this all-in-one GPSD reactor are gained. And under the condition, the decoloration rate is up to 95% within 2.5 min and 0.5 min in the reactor using air and oxygen as gas source to degrade Methyl red dye, and energy efficiency of water treatment are up to 570 and 2770 L (kWh)^-1, respectively. Furthermore, solution conductivity has little effect on dye degradation. Meanwhile, in the case of the same input power, the amplification of reactor discharge electrode does not affect the the energy utilization efficiency of dye degradation.3.Using this reactor result in the better methyl red decolorization and COD can be removed quickly. According to the ozone consumption and intermediate products detected, the -N=N- destructed by ozone mainly contributes to Methyl red decolorization.4. The effects of combination GPSD reactor with different catalysts are investigated in this paper. The catalytic effect of homogeneous catalyst MnO₂ is the best of catalysts in the study, which can improve the removal rate of 16%. The catalytic efficiency of the homogeneous catalysts Fe²⁺ and photochemical catalyst TiO₂ are limited because of the formation of the Fe (â…¢)-complex and competition of active locus.