Research On Generation Of Double Dielectric Barrier Discharge Plasma And Its Degradation In Dye Wastewater

Low temperature plasma is a kind of electronic energy produced by gas ionization is much higher than the reaction gas energy,has the advantage of can occur at room temperature and pressure and continue.Low temperature plasma water treatment technology is a set of high energy electron radiation,ultraviolet light solution,free radical oxidation effect as one of the new advanced oxidation technology,can efficiently remove biodegradable organic pollutants in water,has a good application prospect,but how to improve the degradation effect and energy utilization efficiency is the focus of its research and practical application.In this paper,a double dielectric barrier discharge(DBD)reaction device is designed to construct an experimental system of dual dielectric DBD degradation dye wastewater,study the discharge characteristics of double dielectric DBD under different discharge voltages,and introduce hydroxyl metal oxide as a catalyst into the DBD experimental system to further improve the degradation effect and energy efficiency of DBD for dye wastewater.First,the coaxial double dielectric barrier discharge plasma reactor structure is designed,the influence of reactor geometry parameters,material parameters and applied voltage amplitude on DBD electric field strength is studied by approximate field strength and electrostatic field simulation,and the material and size of the reactor are determined according to the research results.Secondly,discuss the discharge characteristics of DBD under different discharge voltages,determine the electrical parameters of DBD for dye wastewater degradation experiment;take methylene blue(MB)as the target pollutant,construct double DBD plasma dye wastewater degradation experiment system,study the effects of methyl blue,master the generation and evolution and analyze the removal of the chemical oxygen demand(COD)and total organic carbon(TOC)in the discharge process.The experimental results show that the discharge voltage is 12 kV,the initial concentration of the solution is 50 mg/L,and the ventilation flow is 50 mL/min,the discharge rate of methylene blue can reach 79.77%,and the energy utilization efficiency is 9.03 g/kWh.Finally,in order to further improve the energy utilization efficiency of dielectric DBD,the hydroxyl cobalt oxide(CoOOH)was selected from four different hydroxyl metal oxides in DBD and DBD experimental system,affecting the degradation effect and energy efficiency of dielectric DBD degradation.The experimental results show that under the same experimental conditions,the 100 mgCoOOH added methylene blue removal rate was increased by 20.22%to 99.99%,and the energy utilization efficiency was 30.30 g/kWh,2.36 times higher than DBD alone,realizing the design goal of high removal rate and high energy utilization efficiency of methylene blue wastewater degradation.