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Design and Simulation of New Type Reactor in the Wastewater Treatment System Based on Discharge Plasma

The organic pollutants in the wastewater are difficult to treat effectively. The traditional method cannot meet the demand of the degradation rate and the treatment efficiency at the same time. The electro-hydraulic discharge provides a new method for the disposal of the industrial organic wastewater. The working principle of the wastewater treatment system based on discharge plasma is introduced. As the reactor is one of the most important components of the wastewater treatment system based on discharge plasma, the effect of the needle-plate and traditional barrel-type reactor is analyzed. After the solid–liquid–gas (SLG) three-state reactor for the high-voltage-pulsed discharge plasma system is put forward, the working principle of the SLG three-state reactor is introduced. A simulation model of the reactor based on the finite-element method is built. The effect of the voltage, the radius, and the relative permittivity of the solid packing to the electric field distribution is analyzed based on the numerical calculation. The conclusion that SLG three-state reactor of the wastewater treatment system based on the high-voltage-pulsed discharge plasma has a better effect than two-state reactors can be drawn. Furthermore, the high voltage is better for the partial discharge and the generating of the plasma. Meanwhile, small radius and relative permittivity of the solid packing are beneficial to the partial discharge of the reactor.