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[content] => Ozone has strong oxidizing properties and can oxidize various compounds. Therefore, ozone oxidation technology is widely used in water treatment.
Ozone oxidation technology has the following characteristics:
(1) Ozone not only has good rapid sterilization and disinfection properties, but also has a very high oxidative power to oxidize organic and inorganic compounds, and can remove substances that are difficult to remove by other water treatment processes.
(2) The reaction of ozone is complete and fast, so that the volume of the structure can be reduced.
(3) The remaining ozone will be quickly converted into oxygen, which can increase dissolved oxygen in water, with high efficiency, no sludge generation, and no secondary pollution.
(4) While improving purification effect, sterilization and disinfection, it can deodorize and deodorize.
(5) The electricity and air used to prepare ozone do not need to be stored and transported. The ozonation device occupies a small area and is simple to operate and manage. It is especially suitable for improving water quality and water quantity in the original water plant.
Ozone Joint Technology
There are many ozone joint technologies, which can be generally divided into the following categories: ozone ultrasonic method, ozone activated sludge method, ozone membrane treatment method, ozone coagulation method, ozone biological activated carbon adsorption method. These methods have their own advantages and disadvantages for different wastewater, so different processes can be selected according to the difference of refractory substances and toxic substances in wastewater to achieve better results. The following briefly introduces the ozone ultrasonic method and the ozone biological activated carbon adsorption method.
Ozone/ultrasonic method
Ultrasonic waves can effectively degrade refractory organic pollutants in wastewater, and the combined use of ultrasonic waves and ozone can improve the efficiency of organic matter degradation and reduce operating costs. In 1976, D[**]HI discovered that ultrasonic wave can strengthen the process of treating ozone wastewater. He used 20kHz ultrasonic wave to enhance ozone oxidation to treat the effluent of biological sewage treatment plant and found that this technology can reduce the dosage of ozone by 50%.
Ozone/biological activated carbon adsorption method
Ozone biological activated carbon process (O3 - B[**]C) is a process that combines ozone chemical oxidation with activated carbon physical, chemical adsorption and biological oxidation degradation technology. The process has the characteristics of low treatment cost, high organic matter removal efficiency and stable effect.
Ozone oxidation of raw water can decompose macromolecular organic matter into small molecular organic matter, improve the biodegradability of organic matter and provide sufficient oxygen, so that these organic matter can be more easily adsorbed by activated carbon, and the adsorbed organic matter can maintain the life of microorganisms in the carbon bed The activity provides nutrition; at the same time, due to the sufficient oxygen supply, aerobic microorganisms multiply and grow on the surface of activated carbon to form a biofilm to degrade the adsorbed small molecule organic matter. This enables simultaneous adsorption of activated carbon on the carbon bed and microbial degradation, thereby greatly extending the working cycle and efficiency of activated carbon.
[**]pplication of Ozone Combined Technology in Industrial Wastewater Treatment
Treatment of medical wastewater
Most of the medical wastewater has high COD and poor biodegradability. It is uneconomical to simply rely on physical and chemical methods to treat the cost. Ordinary biochemical treatment is not feasible at all. Therefore, ozone pretreatment can be used first, mainly to improve the biodegradability of wastewater. Subsequent biological treatment reduces difficulty and reduces COD at the same time.
Treatment of printing and dyeing wastewater
Printing and dyeing wastewater pollutes the environment very seriously. It has a large amount of water, large fluctuations in water quality, complex and high content of pollutants, and high chroma, chemical oxygen demand (COD) and biochemical oxygen demand (BOD). One of the difficult industrial wastewater. Ozone oxidation technology utilizes the strong reaction selectivity of ozone molecules, which can directly undergo addition reaction with dyes containing double bonds, so that the dyes can be ring-opened and decolorized, and the biodegradability of wastewater can be improved. In addition, under the action of ultraviolet (UV), ozone is converted into strong oxidizing substances such as ˙OH, which reacts with organic matter to break the unsaturated bond in the chromophoric group of the dye, forming a colorless organic acid with a small molecular weight. , aldehydes, etc., to achieve the purpose of decolorization and degradation of organic matter. Combining O3/UV oxidation with conventional biochemistry, biochemical methods are used to remove most of the biodegradable organic matter, and the remaining non-biochemical pollutants are oxidized with O3/UV to reduce ozone consumption and treatment costs, and improve effluent quality.
Treatment of phenolic wastewater
Phenol-containing wastewater is one of the more common and very harmful industrial wastewater. Phenol is a recognized carcinogenic, teratogenic, and mutagenic "three-caused" substance. The treatment of industrial phenol-containing wastewater is an urgent problem in industrial wastewater. one of the problems. Studies have shown that for coking plant wastewater with a phenol content of 227mg/L, a pH value of 7.3-7.6, and a water temperature of 13-40C, the phenol content in the water is reduced by 98% after ozone oxidation treatment.
Treatment of Landfill Leachate
Landfill leachate is a kind of highly polluting organic wastewater with high pollutant content. [**]mong them, there are as many as 77 kinds of organic pollutants, including 5 kinds of carcinogens and auxiliary carcinogens, which are included in the "blacklist" of environmental priority pollutants in my country. . Moreover, landfill leachate will cause great pollution to the surrounding environment, landfill soil and groundwater. Feng Xudong and others used bio-ozonation technology to treat landfill leachate. Experiments show that after ozone oxidation, the CODOF value of landfill leachate biological treatment effluent can be effectively reduced; landfill leachate biological treatment effluent ozone oxidation, its biological There is an extreme value in degradability with the increase of oxidation time, combined with the economics of treatment, the combination of biology-ozone-biology can be used to treat landfill leachate.
Development Status and Trend of Ozone Technology
(1) With the widespread application of ozone technology in water treatment, people realize that the key to ozone technology lies in its reaction mechanism with pollutants in water. There is no clear conclusion on this aspect and it is still under further research.
(2) There is a positive relationship between the efficiency of ozone generation and the frequency of the power supply, and increasing the frequency of the ozone generating power supply has always been an important direction of research. [**]t present, the international standard ozone generator products have a power supply frequency up to about 20 kHz.
(3) Due to the strong oxidation, strong corrosiveness and toxicity of ozone, the material of the treatment process components must use high corrosion-resistant and anti-oxidation materials, which increases the cost of ozone treatment and is not conducive to the widespread promotion of ozone technology. Therefore, how to Reducing the cost of ozone treatment technology has become one of the main tasks of ozone technology research.
(4) The current development trend of ozone generators is that the volume is getting smaller and smaller, the energy consumption is getting lower and lower, the conversion rate of electric energy is getting higher and higher, the yield is getting higher and higher, and the degree of automation of its control is getting higher and higher. The application is getting wider and wider, and the industrial development is also accelerating.
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Ozone has strong oxidizing properties and can oxidize various compounds. Therefore, ozone oxidation technology is widely used in water treatment.
Ozone oxidation technology has the following characteristics:
(1) Ozone not only has good rapid sterilization and disinfection properties, but also has a very high oxidative power to oxidize organic and inorganic compounds, and can remove substances that are difficult to remove by other water treatment processes.
(2) The reaction of ozone is complete and fast, so that the volume of the structure can be reduced.
(3) The remaining ozone will be quickly converted into oxygen, which can increase dissolved oxygen in water, with high efficiency, no sludge generation, and no secondary pollution.
(4) While improving purification effect, sterilization and disinfection, it can deodorize and deodorize.
(5) The electricity and air used to prepare ozone do not need to be stored and transported. The ozonation device occupies a small area and is simple to operate and manage. It is especially suitable for improving water quality and water quantity in the original water plant.
Ozone Joint Technology
There are many ozone joint technologies, which can be generally divided into the following categories: ozone ultrasonic method, ozone activated sludge method, ozone membrane treatment method, ozone coagulation method, ozone biological activated carbon adsorption method. These methods have their own advantages and disadvantages for different wastewater, so different processes can be selected according to the difference of refractory substances and toxic substances in wastewater to achieve better results. The following briefly introduces the ozone ultrasonic method and the ozone biological activated carbon adsorption method.
Ozone/ultrasonic method
Ultrasonic waves can effectively degrade refractory organic pollutants in wastewater, and the combined use of ultrasonic waves and ozone can improve the efficiency of organic matter degradation and reduce operating costs. In 1976, D[**]HI discovered that ultrasonic wave can strengthen the process of treating ozone wastewater. He used 20kHz ultrasonic wave to enhance ozone oxidation to treat the effluent of biological sewage treatment plant and found that this technology can reduce the dosage of ozone by 50%.
Ozone/biological activated carbon adsorption method
Ozone biological activated carbon process (O3 - B[**]C) is a process that combines ozone chemical oxidation with activated carbon physical, chemical adsorption and biological oxidation degradation technology. The process has the characteristics of low treatment cost, high organic matter removal efficiency and stable effect.
Ozone oxidation of raw water can decompose macromolecular organic matter into small molecular organic matter, improve the biodegradability of organic matter and provide sufficient oxygen, so that these organic matter can be more easily adsorbed by activated carbon, and the adsorbed organic matter can maintain the life of microorganisms in the carbon bed The activity provides nutrition; at the same time, due to the sufficient oxygen supply, aerobic microorganisms multiply and grow on the surface of activated carbon to form a biofilm to degrade the adsorbed small molecule organic matter. This enables simultaneous adsorption of activated carbon on the carbon bed and microbial degradation, thereby greatly extending the working cycle and efficiency of activated carbon.
[**]pplication of Ozone Combined Technology in Industrial Wastewater Treatment
Treatment of medical wastewater
Most of the medical wastewater has high COD and poor biodegradability. It is uneconomical to simply rely on physical and chemical methods to treat the cost. Ordinary biochemical treatment is not feasible at all. Therefore, ozone pretreatment can be used first, mainly to improve the biodegradability of wastewater. Subsequent biological treatment reduces difficulty and reduces COD at the same time.
Treatment of printing and dyeing wastewater
Printing and dyeing wastewater pollutes the environment very seriously. It has a large amount of water, large fluctuations in water quality, complex and high content of pollutants, and high chroma, chemical oxygen demand (COD) and biochemical oxygen demand (BOD). One of the difficult industrial wastewater. Ozone oxidation technology utilizes the strong reaction selectivity of ozone molecules, which can directly undergo addition reaction with dyes containing double bonds, so that the dyes can be ring-opened and decolorized, and the biodegradability of wastewater can be improved. In addition, under the action of ultraviolet (UV), ozone is converted into strong oxidizing substances such as ˙OH, which reacts with organic matter to break the unsaturated bond in the chromophoric group of the dye, forming a colorless organic acid with a small molecular weight. , aldehydes, etc., to achieve the purpose of decolorization and degradation of organic matter. Combining O3/UV oxidation with conventional biochemistry, biochemical methods are used to remove most of the biodegradable organic matter, and the remaining non-biochemical pollutants are oxidized with O3/UV to reduce ozone consumption and treatment costs, and improve effluent quality.
Treatment of phenolic wastewater
Phenol-containing wastewater is one of the more common and very harmful industrial wastewater. Phenol is a recognized carcinogenic, teratogenic, and mutagenic "three-caused" substance. The treatment of industrial phenol-containing wastewater is an urgent problem in industrial wastewater. one of the problems. Studies have shown that for coking plant wastewater with a phenol content of 227mg/L, a pH value of 7.3-7.6, and a water temperature of 13-40C, the phenol content in the water is reduced by 98% after ozone oxidation treatment.
Treatment of Landfill Leachate
Landfill leachate is a kind of highly polluting organic wastewater with high pollutant content. [**]mong them, there are as many as 77 kinds of organic pollutants, including 5 kinds of carcinogens and auxiliary carcinogens, which are included in the "blacklist" of environmental priority pollutants in my country. . Moreover, landfill leachate will cause great pollution to the surrounding environment, landfill soil and groundwater. Feng Xudong and others used bio-ozonation technology to treat landfill leachate. Experiments show that after ozone oxidation, the CODOF value of landfill leachate biological treatment effluent can be effectively reduced; landfill leachate biological treatment effluent ozone oxidation, its biological There is an extreme value in degradability with the increase of oxidation time, combined with the economics of treatment, the combination of biology-ozone-biology can be used to treat landfill leachate.
Development Status and Trend of Ozone Technology
(1) With the widespread application of ozone technology in water treatment, people realize that the key to ozone technology lies in its reaction mechanism with pollutants in water. There is no clear conclusion on this aspect and it is still under further research.
(2) There is a positive relationship between the efficiency of ozone generation and the frequency of the power supply, and increasing the frequency of the ozone generating power supply has always been an important direction of research. [**]t present, the international standard ozone generator products have a power supply frequency up to about 20 kHz.
(3) Due to the strong oxidation, strong corrosiveness and toxicity of ozone, the material of the treatment process components must use high corrosion-resistant and anti-oxidation materials, which increases the cost of ozone treatment and is not conducive to the widespread promotion of ozone technology. Therefore, how to Reducing the cost of ozone treatment technology has become one of the main tasks of ozone technology research.
(4) The current development trend of ozone generators is that the volume is getting smaller and smaller, the energy consumption is getting lower and lower, the conversion rate of electric energy is getting higher and higher, the yield is getting higher and higher, and the degree of automation of its control is getting higher and higher. The application is getting wider and wider, and the industrial development is also accelerating.
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