Application Research On Degrading Wastewater Pollutant By Atmospheric Pressure Plasma

In order to effectively solve the problem of environmental damage caused by high pollution wastewater,the atmospheric pressure plasma treatment technology is used in degraded wastewater pollutant.Atmospheric pressure plasma treatment technology,as a new,green,economical and efficient water pollution treatment technology,has been widely concerned by the community.It is a wastewater treatment technology with active particle generated by discharge excitation.The activation energy of the active particle is used to stimulate oxygen molecules to form excited oxygen atoms,ozone,ozone ions and other active substances.These active substances have the ability of rapid oxidation,and can carry out a series of chain reactions in waste water.Finally,the pollutant molecules will be decomposed into carbon dioxide and water.So,the specific research work of this paper is as follows:Firstly,according to the conditions of atmospheric dielectric barrier discharge,the experimental equipment of atmospheric dielectric barrier discharge is designed and manufactured.The discharge characteristics of atmospheric pressure plasma are analyzed and diagnosed by using the pictures of plasma discharge process,the waveform of discharge plasma voltage and current,and the emission spectrum of gas plasma.By adjusting the control parameters of atmospheric pressure plasma discharge,the discharge condition of atmospheric pressure plasma discharge is improved.The optimized parameters of atmospheric pressure plasma discharge device are recorded and a reasonable experimental scheme is designed.In the process of experimental research,the degradation of simulated wastewater by atmospheric pressure plasma was studied.Change according to the nature of the atmospheric pressure dielectric barrier discharge,discharge treatment time,discharge voltage,discharge gas in the process of work,a comprehensive grasp of atmospheric pressure discharge plasma degradation of simulated wastewater treatment as a result,for detailed atmospheric pressure plasma degradation of waste water pollutant discharge parameters,preliminary to clarify the mechanism of atmospheric pressure plasma degradation of simulated wastewater pollutants.According to the results of simulated wastewater degradation by atmospheric pressure plasma,a detailed experimental scheme was designed.Finally,the experiment of actual wastewater degradation by atmospheric pressure plasma was carried out.In the experiment,the mechanism of degradation of wastewater pollutants by atmospheric pressure plasma was verified by adjusting atmospheric pressure plasma discharge parameters,and the mechanism of degradation of wastewater pollutants by atmospheric pressure plasma was elaborated in detail.According to the final results of the experiment,atmospheric pressure plasma degrades the pollutants in the actual wastewater with the parameters of helium gas discharge,the input discharge voltage of 50V,the treatment time of 30min,and the p H of the solution of 7.The degradation efficiency of atmospheric pressure plasma can reach 76%.It can also be understood that atmospheric pressure plasma degrades the essence of waste water pollutant is the chemical bond fracture caused by active particles and the oxidation decomposition of organic molecules.The core of the chemical bond breaking is still hydroxyl radical（-OH）and ozone（O₃）.