Characteristics and applications of diffuse discharge of water electrode in air

Abstract

Plasma water treatment technology, which aims to produce strong oxidizing reactive particles that act on the gas-liquid interface by way of discharging, is used to treat the organic pollutants that do not degrade easily in water. This paper presents a diffuse-discharge plasma water treatment method, which is realized by constructing a conical air gap through an uneven medium layer. The proposed method uses water as one electrode, and a dielectric barrier discharge electrode is constructed by using an uneven dielectric. The electric field distribution in the discharge space will be uneven, wherein the long gap electric field will have a smaller intensity, while the short one will have a larger intensity. A diffuse glow discharge is formed in the cavity. With this type of plasma water treatment equipment, a methyl orange solution with a concentration of 10 mg l −1 was treated, and the removal rate was found to reach 88.96%.

Discharge characteristics and reactive species production of unipolar and bipolar nanosecond pulsed gas–liquid discharge generated in atmospheric N2

“…Recently, nanosecond pulsed gas-liquid discharge (NPG-LD) with dielectric-free electrode configuration in atmospheric pressure has been widely used in many applications, including sterilization [1], water purification [2][3][4], biomedicine [5], and material treatment [6]. Compared with the sinusoidal discharge, the discharges driven by nanosecond pulse power supply are prone to cause lower heat and higher energy efficiency for producing reactive species [7][8][9].…”