Theoretical Prediction Of Aqueous Methanol Degradation Under Acoustic Cavitation

My country is a country with relatively scarce water resources per capita and is listed as one of the thirteen water-poor countries in the world.The continuous advancement of industrialization and urbanization has not only reduced the use function of water bodies in my country,but also led to the deepening of the contradiction between the sustainable development strategy that my country is implementing and the shortage of water resources.This phenomenon has seriously threatened the drinking water health of our residents.At present,most of the sewage treatment technologies commonly used in the industry are through biological and chemical methods,but their treatment methods have certain limitations.Ultrasonic degradation of organic matter is a new type of water pollution treatment technology with the advantages of no secondary pollution and fast degradation rate.However,ultrasonic degradation has not been practically applied to industry due to the difficulty of controlling the reaction conditions,and lacks a certain theoretical basis.In order to improve the theoretical basis of ultrasonic degradation of organic matter and then improve the effect of sewage treatment.The main research object of this paper is single ozone bubble and single ozone bubble group,and the medium considered is water-methanol mixed solution.In the research process,the viscosity,surface tension and compressibility of the mixed solution were considered.On the basis of the Rayleigh-Plesset equation,the ozone bubble,the mass transfer and heat transfer equations of methanol and water vapor were added.The chemical reaction in the bubble mainly includes the reaction of methanol and ozone.break down.This paper uses matlab to numerically simulate the temperature change in the ozone bubble and the dynamic behavior characteristics of the ozone cavitation bubble under the sound field condition,and analyzes the effect of different methanol concentration,sound pressure amplitude,ultrasonic frequency,bubble group number,driving waveform and bubble initial radius In the case of a single ozone cavitation bubble or bubble group collapse,the methanol degradation rate and the number of important oxides change.The results show that the degradation rate of methanol molecules decreases with the increase of ultrasonic frequency,increases with the sound pressure amplitude and increases,and increases with the increase of methanol concentration in the liquid.When the number of bubbles increases,The methanol degradation rate will decrease.When the initial bubble radius increases,the methanol degradation rate will increase.When different driving waveforms are used,the methanol degradation rate will change accordingly.Not only that,theoretical analysis shows that when different influencing factors change,the number of strong oxides in the bubble will also change.This provides theoretical support for improving the deterioration of water pollution.