Ozone technology is an ancient and brand-new technology. 1840 was invented by German chemists, and 1856 was used in water treatment and disinfection industries. At present, ozone has been widely used in water treatment, air purification, food processing, medical treatment, medicine, aquaculture and other fields, which has greatly promoted the development of these industries. Ozone can be generated by ozone generator, and its generation principle can be obtained by high voltage discharge, corona discharge, electrochemistry, photochemistry, atomic radiation and other methods. The principle is that part of oxygen in the air is decomposed and polymerized into ozone by high voltage electricity or chemical reaction, which is an allotropic transformation process of oxygen. The molecular formula of ozone is O3.
Sterilization principle
Ozone is a strong oxidant, and the sterilization process belongs to biochemical oxidation reaction. O3 sterilization has the following three forms:
1, ozone can oxidize the enzymes needed to decompose glucose in bacteria, so that bacteria are inactivated and die.
2. Directly interact with bacteria and viruses, destroy their organelles, DNA and RNA, destroy the metabolism of bacteria, and lead to the death of bacteria.
3, through the cell membrane tissue, invade cells, act on outer membrane lipoprotein and inner lipopolysaccharide, so that bacteria undergo permeability distortion and dissolve and die.
What is the function of ozone sterilizer?
1, the role in public * * * business premises
Using the strong oxidation characteristics of ozone, toxic substances released from decoration, synthetic board and paint can be removed, bacteria and viruses in the air can be killed, microorganisms bred in carpets can be killed, cold germs can be eliminated, the occurrence of influenza can be prevented, and the indoor oxygen content can be increased.
Ozone has excellent deodorization performance. Strong oxidation performance, can quickly decompose odor and other organic or inorganic substances. The main components of odor are amine R3N, hydrogen sulfide H2S, methyl mercaptan CH2SH, etc.
2. Comprehensive functions of hotels and restaurants
Because our country is in a developing period, the environmental pollution is serious, and a large amount of industrial sewage is discharged, the quality of drinking water is difficult to meet the World Health Organization (WHO) standard for direct drinking water. Foreign guests, foreign businessmen, overseas Chinese and tourists who come to China are not only disseminators of modern civilization, but also carriers of regional disease viruses.
3, fruits and vegetables cold storage application
The application of ozone in the storage of vegetables and fruits can not only kill or inhibit the growth of mold, prevent rot, but also prevent aging and other fresh-keeping effects. The mechanism is that ozone can oxidize and decompose ethylene gas C2H4, a ripening agent for fruit and vegetable respiration. Ethylene intermediates also have inhibitory effects on microorganisms such as mold. Ozone can play the role of sterilization, mildew prevention and rapid decomposition of ethylene, so as to slow down metabolism, delay maturity, aging and decay, and cooperate with packaging, cold storage and modified atmosphere to improve the preservation effect.
4. Application of automobile air purification
The biggest advantage of using ozone sterilization method is that it will not leave any harmful substances and will not cause secondary pollution to the car. Ozone disinfection is relatively simple to operate. Just a few minutes, put a hose connected to the special sterilizer for the car into the carriage, turn on the special sterilizer for the car and the air conditioner in the car, and use the air circulation of the air conditioner to send the high-concentration ozone generated by the special sterilizer to every corner of the car. Eliminate germs more thoroughly. The fly in the ointment is that there will be a little ozone smell in the compartment after disinfection, but as long as the window is opened for a while, the ozone will automatically decompose into colorless and odorless gas and evaporate. This method is disinfected once a month, and many car beauty service shops provide ozone disinfection services.
5, green food disease prevention new technology
Ozone, also known as oxygen-enriched, superoxide and triatomic oxygen, is an allotrope of oxygen (O2), and its molecular formula is O3, so it is named because its smell is similar to that after lightning. Ozone is one of the most powerful oxidants in common use, its disinfection and sterilization ability is more than twice that of chlorine, its sterilization speed is 300-600 times that of chlorine and 3000 times that of ultraviolet rays, and there is no dead angle. After the reaction, it was reduced to oxygen and was identified as a clean oxidant with high efficiency and no secondary pollution.
The principle of ozone sterilizer is to use the high penetrating power of ozone to quickly enter the interior of bacteria and kill them. Ozone is harmless to health, so there is no need to worry about secondary pollution or harm.
Compared with conventional sterilization methods, ozone sterilization method has the following characteristics.
1, high efficiency. Ozone disinfection and sterilization is based on air and does not need any other auxiliary materials and additives. Good body tolerance, thorough sterilization, but also has a strong function of removing mold, fishy smell and peculiar smell.
2, high cleanliness. The rapid decomposition of ozone into oxygen is the unique advantage of ozone as disinfection and sterilization. Ozone is produced by using oxygen in the air. In the process of disinfection, excess oxygen combines into oxygen molecules after 30 minutes, and there is no residue, which solves the problem of secondary pollution caused by disinfectant disinfection method and saves washing again after disinfection.
3. Convenient. Ozone sterilizers are generally installed in clean rooms or air purification systems or sterilization rooms (such as ozone sterilization cabinets, transmission windows, etc.). ). According to the sterilization concentration and time verified by debugging, set the time to start and run the sterilizer, which is convenient for operation and use.
4. Economy. By comparing the use and operation of ozone disinfection in many pharmaceutical industries and medical and health units, ozone disinfection method has great economic and social benefits compared with other methods. Today, with the rapid development of industry, environmental protection is particularly important, and ozone disinfection avoids the secondary pollution caused by other disinfection methods.
Advantages of ozone sterilizer
Ozone sterilization is a method of bacteria lysis, which has the advantages of thorough sterilization, no residue and broad spectrum, and can kill bacterial propagules, spores, viruses, fungi and so on. And destroy the botulinum toxin. In addition, O3 also has a strong killing effect on mold. Because of its poor stability, O3 will soon decompose into oxygen or a single oxygen atom, and the single oxygen atom will combine into oxygen molecules without any toxic residue. Therefore, O3 is a pollution-free disinfectant. O3 is a kind of gas, which can quickly spread to the whole sterilization space, and there is no dead angle in sterilization. However, the traditional sterilization methods, whether ultraviolet or chemical fumigation, have shortcomings such as incompleteness, dead angle, heavy workload, residual pollution or odor, and may harm human health. If ultraviolet disinfection is used, it will have no effect where the light can't reach, and it has some shortcomings such as decline, weak penetration and short service life. Chemical fumigation also has shortcomings, such as the sterilization effect on bacteria and viruses with strong drug resistance is not obvious.
The disinfection effect of active oxygen (ozone) is reflected in its strong oxidation, and it is internationally recognized as a green, broad-spectrum and efficient disinfectant. Widely used in drinking water disinfection and air disinfection in medical and health institutions, ozone will be automatically reduced to oxygen after 30-40 minutes, without secondary pollution caused by chemical residues. Applications include disinfection cabinets, fruit and vegetable detoxification machines, gynecological therapeutic instruments, food processing, drinking water filling and disinfection equipment. Details can be verified by consulting popular science books or online inquiry.
There is something wrong with the ozone sterilizer.
As an alternative to chlorine disinfection, ozone disinfection is increasingly applied to drinking water treatment. Experiments show that ozone has obvious inactivation effect on almost all bacteria, viruses, fungi, protozoa and oocysts. Disadvantages are: large investment, higher cost than chlorination disinfection; O3 in water is unstable, so some technology is needed to control and detect O3. After disinfection, the pipeline will be corroded, so there is no residual O3 in the factory water, and secondary disinfection is needed. React with iron, manganese, organic matter, etc. , can produce micro-flocculation, can improve the turbidity of water;
Bromate will be produced when ozone oxidizes raw water containing bromine ions. Bromate has been listed as a class 2B potential carcinogen by the International Agency for Research on Cancer. WHO recommends that the maximum content of bromate in drinking water is 25μg/L, and USEPA drinking water standard stipulates that the maximum allowable concentration of bromate is10 μ g/L. There are two ways to form bromate in the process of ozone oxidation: ozone oxidation and ozone/hydroxyl radical oxidation. Bromate can be controlled from two aspects: controlling its formation and cleaning after formation. Reducing pH value, adding ammonia water and chlorine ammonia and optimizing ozone oxidation conditions are the methods to control the formation of bromate, which can be removed by physical, chemical and biological methods. Therefore, in order to balance ozone, pathogenic bacteria and bromate, it is necessary to further explore the mechanism of ozone sterilization and the control method of bromate.
Matters needing attention in ozone air disinfection
1, ozone can stimulate human respiratory mucosa, and the ozone concentration in the air reaches 0. At 15ppm, it can be sniffed out; According to international standards, it reaches 0. 5- 1ppm can cause discomfort such as dry mouth; Reaching 1-4ppm can cause cough; Up to 4- 10ppm can cause a strong cough. Therefore, ozone disinfection of air must be carried out without people, and it will take at least 30 minutes to enter after disinfection.
2. Ozone is a strong oxidant, which will damage many kinds of articles. The higher the concentration, the more serious the damage to the goods, which can cause green rust spots on copper sheets, aging of rubber, discoloration and reduced elasticity, leading to brittleness and fracture, and bleaching and fading of fabrics.
Ozone sterilization is fast and effective, and its high redox potential determines its wide application in oxidation, decoloration and deodorization. Studies have shown that ozone dissolved in water can kill almost all substances harmful to human body, such as iron, manganese, chromium, sulfate, phenol, benzene, oxides and so on. It can also decompose organic matter and kill algae.