Study On The Optimization Of Plasma Source Of Dielectric Barrier Discharge For Sulfadiazine Degradation

With the rapid development of our country's economy,increasing energy consumption,environmental pollution is becoming more and more serious.Such as water pollution,smoke pollution,soil pollution are all urgent problems to be solved.In recent years,the rapid development of low-temperature plasma technology has been widely used,and has shown great advantages in various industries such as environment,biology,and chemical industry.Dielectric barrier discharge(DBD)is currently a widely used technology.Dielectric barrier plasma source with oxygen as raw material gas can generate high concentration and high output ozone-based oxygen plasma,with strong oxidation potential and high reaction rate characteristics,can effectively and quickly degrade refractory organic pollutants.In this paper,the plasma source is designed using the principle of dielectric barrier discharge,and a narrow gap dielectric barrier strong ionization discharge is achieved by improving the dielectric layer material and processing technology.Using methods such as shooting discharge images,calculating discharge power,analyzing current and voltage waveforms,and measuring the generated ozone concentration,it is verified that the narrow gap structure is the key to the formation of strong ionized dielectric barrier discharge.The article also investigated the factors affecting the high concentration of ozone generated by the plasma source,and the ozone concentration under the conditions of 0.1 mm discharge gap,400 W input power,8 kHz discharge frequency,0.66 L/min gas flow rate,and 0.15 MPa pressure in the plasma reaction chamber It reaches a maximum of 327 g/Nm3 and produces 32.4 g of ozone for every kWh of electricity consumed.In order to study the application of narrow-gap dielectric barrier discharge plasma source in sewage treatment,it is proposed to select the refractory organic substance sulfadiazine as the target pollutant,and explore the influence of different parameters on its degradation efficiency.The input power of the plasma source is 110 W,the volume flow of ozone gas is 0.4 L/min,the pressure of the water pipeline is 0.15 MPa,and the degradation rate of the sulfadiazine solution can reach 100%within 0.89 s.The degradation rates of COD(Chemical Oxygen Demand)and TOC((Total Organic Carbon))reached 76%and 38%,respectively.Therefore,the narrow gap dielectric barrier discharge plasma source has broad application prospects in the field of environmental pollution control.