Ultrasonic Degradation Of Methylene Blue In Reactors Of Different Shapes

There are many ways to treat industrial wastewater,including an efficient and clean ultrasonic method.Standing wave is easy to be generated in sonochemical reactors by ultrasonic method,which is not conducive to improving the degradation efficiency of organic pollutants in wastewater.Ultrasonic degradation has different degradation effect in reactors of different shape.In this paper,sound field equation in reactors of different shape is derived based on fluid dynamics equations,and the sound field distribution of ultrasonie wave in different shape of reactors is simulated.Ultrasonic wave is used to degrade water sample in different shape of reactors by experimental operation,so as to improve the sound field distribution and the degradation efficiency.The results are as follows:1.From sonic basic equations,combined with the knowledge of the fluid dynamics,heat transmission and viscous effect,the nonlinear equation of ultrasonic wave propagating in the liquid in different shape of reactors is derived.And combined with the initial conditions and boundary conditions,the dimensionless equation of ultrasonic wave propagating in the liquid in different shape of reactors is derived.Then,considering the frequency domain expansion of the dimensionless equation,the sound field equation of ultrasonic wave propagating in the liquid in different shape of reactors is derived.The sound field distribution in different shape of reactors is discussed through calculation and analysis.The results show that the sound field distribution is related to the shape of the reactor,and the sound pressure value in the conical reactor is large under the same conditions.2.The acoustic transmission phenomenon in different shape of reactors is simulated.When the ultrasonic wave acts on the beaker and the conical flask without vortex,there is no change in sound pressure in the beaker.But sound pressure increases in the conical flask.At the same time,the acoustic wave in the conical flask changes,and the sound pressxure value in the conical flask is larger than that in the beaker.When the ultrasonic wave acts on the beaker and the conical flask with vortex,the sound wave in the beaker changes slightly,the sound wave in the conical flask obviously changes and the sound pressure value is higher.At the same time,the sound wave in the conical flask continues to change,and the sound pressure value is larger than that in the beaker.Whether the vortex works or not,the conical flask has the stronger change,and has a larger sound pressure value than the beaker.3.The degradation of water sample in different shape of reactors is investigated by experimental operation.When the ultrasonic wave acts on the beaker and the conical flask without stirring,the methylene blue is both degraded in the beaker and conical flask,and the degradation is better in the conical flask.At the same time,the degradation is better in the conical flask.When the ultrasonic wave acts on the beaker and the conical flask with stirring,the degradation rate of methylene blue in the beaker and conical flask significantly increases,and the degree of degradation in the conical flask is intensified.At the same time,the degradation in the conical flask is more complete and the effect is better.Whether the stirring works or not,the degradation of water sample in conical flask is better than that in the beaker.By exploring the transmission of ultrasonic wave in different shape of reactors,it is found that the shape of reactors can be changed to improve the sound field distribution.The experiment proves that the shape of reactors is related to the degradation effect.Therefore,it is possible to change the shape of reactors,and to improve the degradation efficiency.