Research On The Synergistic Effect Of Ultrasonic Degradation Of Organic Pollutants In A Complex Environment

Environmental pollution and energy shortage have become two major problems restricting human development.With the harmonious development and the deepening of the scientific concept of development,people gradually realize the importance of environmental protection.Water pollution and atmospheric pollution are the most direct impacts of the destruction of the natural environment on people.At present,many methods have been developed to treat industrial wastewater and dye wastewater.As one of the methods to treat water pollution,ultrasonic degradation has been widely used in the study of organic pollutants in wastewater treatment.In this paper,the synergistic effect of ultrasonic degradation of organic pollutants in complex environment will be studied from the factors affecting ultrasonic degradation.The effects of reactor structure,ultrasound-assisted catalytic degradation of organic pollutants,ultrasound-assisted periodate degradation of organic pollutants in seawater and different surface tensions on ultrasound-assisted degradation of organic pollutants were studied.It's specific research contents are as follows:?1?By simulating the internal acoustic field of the cylindrical,conical and hemispherical composite sonochemical reactors by software,the intensity and uniformity of the acoustic field inside the hemispherical composite reactor can be seen by analyzing the internal acoustic field of different structural sonochemical reactors.Both are stronger than cylindrical reactors and conical reactors.The study of the acoustic field distribution in different shapes of reactors helps to select the appropriate shape of the reactor structure in the fields of sonochemical reaction,ultrasonic cleaning,etc.,in order to achieve the best energy utilization efficiency and effect.?2?Microsphere Bi₂O₂CO₃ was prepared by hydrothermal method.The results of XRD,SEM,UV-vis and specific surface area analyzer show that the porous microsphere structure of Bi₂O₂CO₃ sample is 5-8 ?m.and has a high specific surface area,in which the specific surface area can reach 20.89 m2/g.Rhodamine B was used as a simulated pollutant to degrade Rhodamine B by ultrasound.By changing the experimental conditions,the degradation rate could reach 91.7%.It can be seen that ultrasound combined with microsphere Bi₂O₂CO₃ can effectively improve the degradation efficiency of pollutants.?3?Degradation of Rhodamine B in seawater by the use of ultrasound in combination with periodate.The effects of ultrasonic synergistic periodate on the degradation of rhodamine B in seawater were studied by changing the experimental parameters.The main oxidizing groups in the reaction process were identified.The results show that ultrasonic combination with periodate can be used as an effective and rapid treatment of organic pollutants in the ocean.Hydroxyl radicals are the main oxidizing groups in the degradation process.The optimal dosage of periodate in the degradation process makes the degradation efficiency of rhodamine B the highest,which can help to improve the degradation efficiency of rhodamine B under strong acid conditions.?4?The effect of five different surface tensions on the degradation of rhodamine B by ultrasound was studied by using surfactant to change the surface tension of liquid.In the experiment,the degradation rate of Rhodamine B was used to characterize the effect of surface tension on the ultrasonic degradation process.Then the influence of surface tension on the bubble pulsation process was numerically analyzed.The dynamic parameters including bubble radius,expansion time,collapse time,bubble expansion ratio and bubble energy ratio before and after collapse were studied.The results show that the degradation efficiency increases with the increase of surface tension,and there is a non-linear characteristic.The surface tension affects the dynamic parameters of bubbles,shortens the time required for bubble expansion and collapse,increases the utilization of energy,increases the yield of free radicals,and affects the corresponding increase of ultrasonic degradation efficiency.