Abstract: The small edition of Qingdao Aikang ozone generator manufacturer collates the development and characteristics of ozone oxidation technology, discusses the ozone combined technology and its application in the treatment of industrial sewage, and summarizes the development status and trend of ozone oxidation technology.
Ozone has a strong oxidizing ability and can oxidize a variety of compounds, so 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 oxidation power of organic and inorganic compounds, which can remove substances difficult to be removed by other water treatment processes.
(2) The reaction of ozone is complete and fast, which can reduce the volume of the structure.
(3) The remaining ozone will be rapidly converted into oxygen, can increase dissolved oxygen in water, high efficiency, does not produce sludge, does not cause secondary pollution.
(4) While improving the purification effect, sterilization and disinfection, it can remove the smell and odor.
(5) The electricity and air used for the preparation of ozone do not need to be stored and transported, the ozonization device occupies a small area, the operation and management are simple, and it is especially suitable for improving the water quality and water quantity of the original water plant.
There are more ozone combined technologies, which can generally be divided into the following types: ozone ultrasonic method, ozone activated sludge method, ozone film treatment method, ozone coagulation method, ozone biological activated carbon adsorption method. These methods have advantages and disadvantages for different wastewater, so different processes can be selected to achieve better results according to the difference of refractory substances and toxic substances in wastewater. The following is a brief introduction to ozone ultrasonic method and ozone biological activated carbon adsorption method.
2.1 Ozone/Ultrasonic method
Ultrasonic can effectively degrade refractory organic pollutants in wastewater. Combined use of ultrasonic and ozone can improve the efficiency of organic matter degradation and reduce operating costs. In 1976, DAHI had already discovered that ultrasound could enhance the treatment of ozone wastewater. When he used 20kHz ultrasound to enhance ozone oxidation to treat the effluent from a biological sewage treatment plant, he found that this technology could reduce the amount of ozone added by 50%.
2.2 Ozone/biological activated carbon adsorption method
Ozone biological activated carbon process (O3-BAC) is a process that integrates 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.
When raw water is oxidized by ozone, it 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 are more easily adsorbed by activated carbon, and the adsorbed organic matter provides nutrition for maintaining the life activities of microorganisms in the carbon bed. At the same time, due to sufficient oxygen supply, aerobic microorganisms multiply and grow into biofilms on the surface of activated carbon to degrade the adsorbed small molecules of organic matter. This allows the adsorption of activated carbon and microbial degradation on the carbon bed to be carried out at the same time, thus greatly extending the working cycle and efficiency of activated carbon.
3.1 Treatment of pharmaceutical wastewater
Most of the medical wastewater COD is high, poor biodegradability, simply rely on physical and chemical methods to treat the cost is high and uneconomical, ordinary biochemical treatment is simply not feasible, so you can first use ozone pretreatment, mainly in order to improve the biodegradability of wastewater, reduce the difficulty for subsequent biological treatment, while reducing COD.
3.2 Treatment of printing and dyeing wastewater
Printing and dyeing wastewater is very serious pollution to the environment, its water volume, water quality fluctuation, pollutant composition complex and high content, chroma, chemical oxygen demand (COD) and biochemical oxygen demand (BOD) are high, is one of the difficult to treat industrial wastewater at home and abroad. Ozone oxidation technology is the use of ozone molecule reaction selectivity, and can directly with the double bond dye additive reaction, so that the dye open ring decolorization, and improve the biodegradability of wastewater. In addition, under the action of ultraviolet (UV), ozone is converted into strong oxidizing substances such as ·OH, which reacts with organic matter, breaking the unsaturated bonds in the chromatics group of dyes, generating organic acids and aldehydes with small molecular weight and colorless, etc., to achieve the purpose of decolorization and degradation of organic matter. The combination of O3/UV oxidation and conventional biochemistry is used to first remove most of the biodegradable organic matter by biochemical method, and the remaining non-biodegradable pollutants are oxidized by O3/UV to reduce ozone consumption and treatment costs, and improve effluent water quality.
3.3 Treatment of phenolic wastewater
Phenol-containing wastewater is one of the most common and harmful industrial wastewater. Phenol-containing wastewater is one of the recognized carcinogenic, teratogenic and mutagenic substances. The treatment of phenol-containing wastewater is one of the urgent problems to be solved. The research shows that the phenol content of coke plant wastewater is 227mg/L, pH value is 7.3-7.6, and water temperature is 13-40C, after ozone oxidation treatment, the phenol content of water is reduced by 98%.
3.4 Treatment of landfill leachate
Landfill leachate is a highly polluting organic wastewater with high pollutant content, of which there are 77 kinds of organic pollutants, including 5 kinds of carcinogens and 5 kinds of carcinogens, which are listed in the "blacklist" of environmental priority control pollutants in China. Moreover, the landfill leachate will cause great pollution to the surrounding environment, landfill soil layer and groundwater. Feng Xudong et al. studied the treatment of landfill leachate by using bio-ozone oxidation technology. The experiment showed that the CODOF value of biological treatment effluent of landfill leachate could be effectively reduced after ozone oxidation. After ozonation, the biodegradability of wastewater from biological treatment of landfill leachate has an extreme value with the increase of oxidation time, and the combined bioozone-biological technology can be used to treat landfill leachate in combination with the economy of treatment.
(1) With the wide application of ozone technology in water treatment, it is recognized that the key to ozone technology is its reaction mechanism with pollutants in water, which has not yet been clearly determined and is still under further study.
(2) The efficiency of ozone generation is positively related to the frequency of power supply, and improving the frequency of ozone generation power supply has always been an important direction of research. At present, the international standard ozone generator products, the highest power frequency is about 20 kHz.
(3) Due to the strong oxidation, strong corrosion and toxicity of ozone, so the material of the treatment process elements must be high corrosion resistance and antioxidant materials, which makes the cost of ozone treatment increase, which is not conducive to the widespread promotion of ozone technology, so how to reduce the cost of ozone treatment technology has become one of the main work of ozone technology research.
(4) At present, the development trend of ozone generators is smaller and smaller, lower and lower energy consumption, higher and higher energy conversion rate, higher and higher production rate, higher and higher automation of its control, more and more widely used ozone, and faster industrial development.
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Qingdao Aikang Environmental Protection Technology Co., Ltd. is a 15-year focus on ozone generator R & D, manufacturing and application of professional companies, the company has been to serve customers as the purpose, to technology as the guide, independent development of ozone generator manufacturing and application technology, obtained zhuanli dozens, has a sincere cooperation generator manufacturing and application team.
Related products: Ozone generator, large ozone generator, industrial ozone generator, ozone, oxygen rich source disinfection, sewage treatment, disinfection, environmental protection, flue gas denitrification desulfurization
