Special type of plasma dielectric barrier discharge reactor for direct ozonization of water and degradation of organic pollution

Abstract

A system based on the dielectric barrier discharge (DBD) with improved discharge homogeneity, used for direct ozonization and purification of water, is presented here. A special design of the atmospheric DBD system is characterized by incorporation of a porous ceramic segment in the zone between electrodes. This porous segment was placed on the metallic electrode and served as a guide for flowing water. Due to the hydrophilic force it allowed the water to remain undisturbed by the electrical discharge. This feature enabled a reduction of the discharge gap and subsequently an increase in the intensity, stability and homogeneity of the discharge. It was observed that under such a configuration a transition from the filamentary mode to the semi-homogeneous mode of the plasma discharge could be realized. Discharge properties were investigated by the optical emission spectroscopy method and the results showed the domination of nitrogen lines in the UV-A region. Further it was observed that the system can be operated in a wide range of liquid conductivities and under negligible heat deposition to the liquid solution. Finally, the formation of dissolved ozone and hydrogen peroxide in the deionized water was measured and decomposition tests with organic dye were performed.

Decolorization of reactive textile dyes using water falling film dielectric barrier discharge

“…Various discharges in water are described in a review article by Bruggeman and Leys [13]. Since we used a discharge formed above the water surface, here we only mention this type of electrical discharge, which has been used for degradation of various organic compounds: phenols, benzenes, pharmaceutical compound and less extent organic dyes [14][15][16][17][18][19][20][21][22][23][24]. Our discharge is based on the dielectric barrier discharge (DBD), which is a typical non-equilibrium high pressure AC gas discharge.…”

Proliferation-Related Activity in Endothelial Cells Is Enhanced by Micropower Plasma

“…On the other hand, H 2 O 2 was produced by the following reaction between OH groups. The OH group was generated by the disassociation of H 2 O due to the plasma at the gas-liquid interface [23]. $\begin{array}{c}T1\mathrm{O}\mathrm{H}+\mathrm{O}\mathrm{H}⟶{\mathrm{H}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{2}}\end{array}$In addition, the micropower plasma might produce O 3 according to the following reaction [24].…”

Structure and Properties of Graphene Oxide－Chitosan Composite Membrane Prepared by the Plasma Acid Solvent

“…Previous reports [11][12] have shown that a large amount of oxygen species, including O atoms, OH· radicals and HO2 ・radicals, were produced during the reaction of producing plasma species.…”