1. Introduction: At present, with the continuous development and progress of the social economy, the scale of social production is constantly expanding, resulting in increasingly serious water pollution. However, with the improvement and enhancement of people's living standards, the quality requirements for water are also increasing. Therefore, it is necessary to do a good job in wastewater treatment. Due to its advantages such as low consumption, fast reaction speed, and low environmental pollution, ozone oxidation has been widely used in the treatment of wastewater. Currently, it has developed into the use of ozone combined oxidation technology, such as ozone ultrasound technology, ozone electrolysis treatment combined technology, and so on. This article will explore how to effectively use ozone combined oxidation technology in wastewater treatment, for reference only. 2. The mechanism of ozone oxidation technology is based on the physical properties of ozone, which has unstable properties. In practical situations, if ozone is in the air, it will gradually and continuously decompose into oxygen and emit a large amount of heat. However, the concentration of ozone in the air should be controlled below 25%, as an explosion can occur if the concentration of ozone exceeds 25%. However, the concentration of ozone in the air is generally below 10%, so there will be no explosion. When the concentration of ozone in the air is below 1%, the process of ozone decomposition begins in air at room temperature and pressure, and its half-life is about 16 hours; When ozone is in water and the concentration of ozone is 3mg/l, its half-life is 15-30min. If ozone decomposes in water, the higher the temperature and pH value of the water, the faster the decomposition rate of ozone. Therefore, in practical situations, ozone is usually produced and utilized on-site. From the perspective of the chemical properties of ozone, ozone, as an isomer of oxygen, is a colorless or light blue gas. Ozone has excellent oxidation and sterilization abilities, but due to its unstable properties, it cannot store ozone. Ozone can attack negatively charged atoms in organic matter, leading to electrophilic reactions; Ozone can attack positively charged atomic nuclei in organic molecules, leading to nucleophilic reactions. In the process of industrial production, corona discharge is generally used. During the discharge process, oxygen undergoes ionization and becomes ions, while highly active oxygen ions react with oxygen molecules to ultimately form ozone. Ozone undergoes oxidation reaction in aqueous solution. Because ozone, as a strong oxidant, has unstable properties, O3 and its intermediate products that decompose in water have strong free oxidizing properties. Therefore, ozone can rapidly and widely oxidize certain elements and organic compounds in aqueous solutions, even at low concentrations. Ozone can quickly complete the oxidation process. The decomposition conditions and mechanisms of ozone play a decisive role in the oxidation process of ozone. Ozone can form hydroxyl radicals HO - in water. The hydroxyl radical HO - has a strong oxidizing effect, which can play a role in disinfection and sterilization, while also decomposing pollutants in water. The use of ozone oxidation technology to form small molecule acids continuously increases the acidity of aqueous solutions. Therefore, it is necessary to add appropriate alkali to the treatment solution to maintain an appropriate pH value and lay the foundation for the effectiveness of wastewater treatment. 3. The application of ozone combined oxidation technology in sewage treatment. Currently, ozone combined oxidation technology has been used in the process of sewage treatment. The use of ozone combined oxidation technology can improve the treatment effect of sewage and lay the foundation for water quality.
3.1 Ozone Ultrasonic Technology Ultrasonic waves can degrade organic pollutants that are difficult to degrade in water. Therefore, using ozone ultrasonic technology can lay the foundation for the effectiveness of sewage treatment while saving operating costs. In 1976, Dahi had already realized that ultrasound could improve the effectiveness of ozone treatment for sewage. During the process of treating biological sewage with ozone oxidation technology, Dahi also used 20kHz ultrasound to improve the treatment effect of ozone oxidation technology. When discharging water, he found that using 20kHz ultrasound could save 50% of the amount of ozone input. In China, scholar Zhao Chaocheng used ozone ultrasound technology in the treatment of phenol containing wastewater. After research, it was found that using ultrasound radiation in the oxidation process can improve the reaction speed. Compared to using ultrasound or ozone alone, ozone ultrasound technology can enhance the effectiveness of wastewater treatment. The higher the power of ultrasound, the stronger the ability to accelerate the reaction. In recent years, extensive research has found that ultrasound can increase the frequency of ozone use. Compared to simple ozone oxidation technology, ozone ultrasound technology can enhance the speed and effectiveness of dye decomposition. In the process of dye degradation, ozone and ultrasound react together to form a large number of strong oxidative free radicals, which improve the effectiveness of dye degradation. 3.2 Ozone electrolysis combined technology In practical situations, ozone oxidation technology is widely used in modern industry to treat wastewater due to its significant advantages, such as strong oxidizing properties, no secondary pollution after reaction, etc. Micro electrolysis technology, also known as internal electrolysis technology, is widely used in the treatment of biologically recalcitrant wastewater. Due to the mature theory of internal electrolysis technology and its advantages of good treatment effect, low investment cost, and practicality, the use of internal electrolysis technology has been increasingly recognized by more and more people. Internal electrolysis technology forms Fe2+and Fe3+during use, while ozone oxidation technology forms a large amount of hydroxyl radicals during use. By combining ozone oxidation technology and electrolysis treatment technology in wastewater treatment, Fe2+and Fe3+can be combined with hydroxyl radicals to form another excellent wastewater treatment reagent. The combined technology of ozone electrolysis treatment can integrate the functions of electrochemical corrosion, chemical oxidation, catalytic oxidation, coagulation adsorption, etc. It has been proven through practice that using this technology in the pretreatment process of diosgenin wastewater can reduce the treatment load of subsequent biochemical methods and improve the effectiveness of wastewater treatment. Yan Haibo et al. used ozone electrolysis combined technology in the treatment of dye wastewater, which significantly improved and enhanced the effectiveness of dye wastewater treatment.
3.3 Catalytic ozonation technology In recent years, catalytic ozonation technology has been widely used. Under normal temperature and pressure conditions, single ozone oxidation technology is difficult to play a role in the treatment of wastewater. In this case, catalytic ozonation technology can be used. With the main research goal of improving the production and generation rate of OH, catalytic oxidation technology is also constantly developing and maturing, such as photocatalytic ozonation technology, alkaline catalytic ozonation technology, and multiphase catalytic ozonation technology. The photocatalytic ozonation technology mainly uses ultraviolet light (UV) as the energy source, O3 as the oxidant, and ozone to decompose under UV irradiation to form active secondary oxidants for the oxidation of organic matter. For organic wastewater that is difficult to degrade, using photocatalytic oxidation to treat it can change the molecular structure of these substances, form new substances that are easily biodegradable, and improve the treatment efficiency of wastewater. The alkaline catalytic ozonation technology mainly catalyzes OH - to form OH radicals, and finally oxidizes the decomposed organic matter. Multiphase catalytic ozone oxidation technology is a new technology, whose main purpose is to decompose O3, thereby forming active free radicals and improving the oxidation efficiency. 4. The advantages of ozone combined oxidation technology in sewage treatment. At present, with the continuous development of industrialization and the expansion of social production scale, water pollution is becoming more and more serious. However, with the continuous improvement of people's quality of life, the demand for drinking water quality is increasing. Therefore, it is necessary to do a good job in sewage treatment. At present, ozone combined oxidation technology is widely used in the process of sewage treatment to ensure the effectiveness of sewage treatment. In the process of sewage treatment, the use of ozone combined oxidation technology can improve the effectiveness of sewage treatment. In the process of sewage treatment, ozone oxidation technology is used alone. If there are difficult to degrade substances in the sewage, the treatment effect is not significant. However, ozone combined oxidation technology can effectively decompose the difficult to degrade substances, improve the treatment effect of sewage, and thus improve the quality of daily water use for people. The use of ozone combined oxidation technology in sewage treatment can save the cost of sewage treatment and improve the effectiveness of sewage treatment. Therefore, the use of ozone combined oxidation technology in sewage treatment has good economic and social benefits. Therefore, the scope of application of ozone combined oxidation technology is becoming increasingly wide. Finally, the use of ozone combined oxidation technology in sewage treatment can have a protective effect on the environment, alleviate water pollution, improve water quality, provide better water resources for social production and daily water use, and promote social development and progress. 5. In conclusion, ozone combined oxidation technology plays an important role in the treatment of sewage, so it is necessary to use ozone combined oxidation technology reasonably to improve the effectiveness of sewage treatment. In the process of sewage treatment, the use of ozone combined oxidation technology can effectively decompose impurities in water, reduce the color of water, and ensure the effectiveness of sewage treatment. At the same time, the use of ozone combined oxidation technology can protect the environment, so the scope of its use is becoming increasingly wide.
