1, strong oxidative The oxidizing power of ozone is almost the strongest among the currently known oxidants. At the same time, the decomposition rate of ozone in water is very fast. It can quickly return to the state of oxygen in an aqueous solution containing impurities, and its decay time is 5.30 min. If the water temperature is close to 0 ° C, it can be more stable. In addition, studies have shown that the decomposition rate of ozone in water increases with the increase of water temperature and pH. Because ozone has strong oxidizing property, it can react with all metals except gold and platinum to oxidize many organic substances. 2, easy to decompose Ozone is chemically active. It can be decomposed into oxygen at room temperature and releases 284 kJ/mol of heat during decomposition. The specific chemical formula is: 2O3=3O2 The decomposition rate of ozone in the air is related to the temperature and the concentration of ozone itself. Studies have shown that the higher the temperature in the external space, the greater the concentration of ozone, the faster the decomposition rate; and the rate at which ozone decomposes in water. It is related to water temperature and pH (pH). The higher the water temperature, the higher the decomposition rate of ozone, and the higher the pH value, the stronger the alkalinity of water, the faster the decomposition of ozone [3][4] . 3, strong corrosive Ozone is highly oxidizing, so ozone can oxidize almost all metals in the air except platinum and gold, so this also reflects the corrosive nature of ozone. Moreover, ozone also has a strong corrosive effect on non-metallic materials. For this reason, in the actual production, 25% of ferrochrome alloy is often used to manufacture ozone generating equipment. In the equipment and metering equipment, general rubber cannot be used as the sealing material, and corrosion-resistant silica gel or acid-resistant rubber must be used. 3] [4]. Third, the role of ozone Based on the above characteristics of ozone, we can use ozone technology to achieve the following goals in the field of sewage treatment and reclaimed water: 1, ozone disinfection 1.1 Mechanism of ozone disinfection There are two ways in which ozone can be sterilized in water: one is that ozone acts directly on the cell wall of bacteria, destroying it and causing cell death; the other is that when ozone decomposes in water, it releases free-radical oxygen [5]. Free radical oxygen has strong oxidizing ability, can penetrate the cell wall, oxidize and decompose the glucose oxidase necessary for oxidizing glucose inside the bacteria, or directly interact with bacteria and viruses, destroy its organelles and ribonucleic acid, and decompose DNA, RNA, protein, Macromolecular polymers such as lipids and polysaccharides can destroy the metabolism and reproduction of bacteria; they can also penetrate cell membrane tissue, invade cell membranes and act on outer membrane lipoproteins and internal lipopolysaccharides to promote cell lysis and death. Further, the genetically modified gene, the parasitic species, the parasitic virus particles, the bacteriophage, the mycoplasma, and the pyrogen (bacterial virus metabolite, endotoxin) in the dead cells are decomposed and degenerated. Some scholars believe that ozone acts on the surface of cells, changing the permeability of cell membranes, and eventually causing cellular components to leak into the intermediate medium [2]. The inactivation of ozone by bacteria is always very rapid. Unlike other fungicides, ozone reacts with bacterial cell wall lipid double bonds, penetrates into the interior of the cells, acts on proteins and lipopolysaccharides, alters cell permeability, and causes bacterial death. Ozone also acts on nuclear material in cells, such as purines and pyrimidines in nucleic acids that destroy DNA. The effect of ozone on the virus is firstly to act on the four polypeptide chains of the viral coat protein and to damage the RNA, especially the protein. After the phage was oxidized by ozone, it was observed by electron microscopy that the epidermis was broken into many fragments, and many ribonucleic acids were released from it, which interfered with its adsorption onto the deposit, and the ozone was completely sterilized [6]. 1.2 Factors affecting ozone disinfection Ozone has a very high sterilization efficiency when used for disinfection of drinking water, but it requires a large amount of ozone and a long contact time when disinfecting sewage. The main factors affecting the disinfection effect are summarized below. 1.2.1 Effect of raw water pH Through kinetic experiments, under the condition of fixed gas flow rate (Q=10L/h), the disinfection effect of ozone on experimental water at different pH values ​​was examined. Take pH=6.7 and pH=8.0 as examples [7]. The experimental results show that under the same time conditions, the ozone existence time is longer than the existence time when the water quality is acidic, so the disinfection effect when the water quality is acidic is better than the disinfection effect under the alkaline condition. 1.2.2 Effects of other substances in the water Mainly water contains COD, NO2-N, suspended solids, color, etc. These substances will consume ozone in water. Occasionally, there is an increase in COD after sewage ozone disinfection. This is mainly because ozone oxidizes refractory inert substances in water into small molecules or opens some ring-shaped organic compounds, thereby improving the original BDOC [8]. It is necessary to pretreat the raw water beforehand to remove the organic matter as thoroughly as possible. 1.2.3 Effects of ozone dosage and residual ozone The amount of ozone required for different water quality is different. The larger the dosage of ozone and the longer the contact time, the better the effluent quality [10-11]. MPetala performs advanced treatment on the secondary effluent of the common activated sludge process, and then effluent after ozone disinfection reaches the US EPA reuse water quality standard. 1.2.4 Impact of ozone exposure Ozone decomposes rapidly in water. According to the principle of gas-liquid mass transfer, increasing the mass transfer efficiency of ozone can improve the utilization of ozone. Therefore, different dosing methods are used, and the utilization rate of ozone is different. 2. Decolorization of ozone technology in wastewater treatment The strong oxidizing properties of ozone can also be used to reduce BOD, COD, decolorization, deodorization, deodorization, algae removal, iron, manganese, cyanide, phenol, etc. [15]. At present, the ozone oxidation method is mainly used for printing and dyeing wastewater treatment. Among them, the application of decolorization is important. According to the provisions of 4.1.2.1 of the “Sewage Discharge Standards for Urban Sewage Treatment Plants†(GB18918-2002) officially implemented on July 1, 2003, when the sewage from the sewage treatment plant is used for urban landscape water and general reuse, sewage The effluent quality of the treatment plant is subject to the A standard of the first-class standard, and the color is ≤30. It is required to decolorize, deodorize and sterilize the reclaimed water [16]. Ozone has a good effect on the oxidative decomposition of colored organic matter in water by a trace amount of ozone. The colored organic matter is generally a polycyclic organic substance having an unsaturated bond, and when treated with ozone, the unsaturated chemical bond can be opened to break the bond, thereby making the water clear. Fourth, examples and applications: 1. The author conducted a sampling comparison on the inlet and outlet water of Jiangsu Shuyang Chemical Industry Park Wastewater Treatment Plant and Beijing Yanqing Wastewater Treatment Plant: Sampling conclusions (during water sample collection): (1) The decolorization effect is obvious, and the effluent water quality index is stable. (2) The effluent quality of the sewage treatment plant meets the design standards. 2. The author communicated and communicated with the technical staff of Xylem Company in the United States, especially the reliability of ozone technology utilization in Tongxiang Fengqi Water Treatment Project. At present, ozone equipment in the water treatment industry has formed an industrial scale, especially the intensification of equipment has greatly facilitated the construction and operation of remote areas and economically underdeveloped areas. It also expands the idea for the proposal of this paper. V. Problems: (1) The preparation of ozone is costly and consumes a lot of energy. (2) The disinfection effect is greatly affected by water quality. (3) There are few studies on ozone disinfection by-products, which increases the risk of ozone disinfection. With the popularization of advanced sewage treatment technology and wastewater reuse, the research and application of ozone disinfection will be more and more, and the combined disinfection of ozone and other disinfection methods will be the future development trend. Conclusion The ozone has clear characteristics, clear mechanism and mature technology. It can be effectively applied to the sewage treatment of highly polluting enterprises, and can be well decolorized and disinfected for the treatment of reclaimed water. It is conceivable that oil deposits such as Xinjiang are abundant in the western part of China (such as Xinjiang), and related industries are booming, resulting in a large amount of highly polluted wastewater. At the same time, Xinjiang is one of the regions with severe water scarcity. If ozone technology is used to control high-concentration water pollution, it will directly treat sewage as a reclaimed water standard as a process, thus solving the problem of high-pollution water treatment and solving the problem of local water shortage. This should be a wise move. At present, this scheme of direct use of ozone technology to achieve reclaimed water standards from high-concentration polluted wastewater has been applied to the sewage treatment plant project of Xinjiang Wuwu Industrial Park.