Application of water treatment ozone generator and ozone standard
Application of ozone generator in water treatment
I. Water treatment ozone generator food drinking water treatment
The most extensive and successful area of ​​ozonation technology is the treatment of drinking water. Ozone is used in drinking water treatment. In addition to good sterilization effect and no secondary pollution, it also has decolorization, deodorization, removal of iron, manganese, oxidative decomposition of organic matter and coagulation. Some reports indicate that ozone can kill water. Everything that is harmful to the human body.
The international standard for drinking water is that the total number of bacteria and coliform bacteria are zero. Western Europe and the United States and other countries have implemented this standard, so the application of ozone water treatment products by tap water supply companies is very common. Due to the development of China, the economy is relatively backward. The national sanitary standard for drinking water is <100 total bacteria, coliform group <3, and most of them use bleaching powder, chlorination and oxidation in recent years. Chlorine and sodium hypochlorite occur in equipment disinfection. Because chlorine disinfection produces secondary pollution caused by chlorine derivatives, trihalomethanes are direct carcinogens and have been phased out in drinking water treatment in Europe and the United States. As far as the current domestic ozone generator price is concerned, the price is similar to or even lower than that of chlorine dioxide and sodium hypochlorite. However, there is still a process for people's awareness level and lack of funds for equipment renewal.
<100, coliform group <3, and most of them use bleaching powder, chlorination and equipment disinfection of chlorine dioxide and sodium hypochlorite promoted in recent years. Because chlorine disinfection produces secondary pollution caused by chlorine derivatives, trihalomethanes are direct carcinogens and have been phased out in drinking water treatment in Europe and the United States. As far as the current domestic ozone generator price is concerned, the price is similar to or even lower than that of chlorine dioxide and sodium hypochlorite. However, there is still a process for people's awareness level and lack of funds for equipment renewal. ?
In 1996, the Ministry of Health issued a document requiring that the secondary water supply must be installed with disinfection facilities. The self-prepared wells of some units must also be allowed to be used when the water quality is up to standard. The secondary water supply disinfection and treatment products are currently only in the second Oxygen chloride, sodium hypochlorite and ozone generation equipment are selected. Ozone water treatment has a strong competitive advantage and should be a mature market. The mineral water, purified water and bottled water that have arisen in recent years have become a must-have market for ozone technology products. It is difficult to reach the standard after leaving the ozone equipment.
When drinking water is used, the dosage of ozone is generally 1-3mg/L, and the contact time is 10-15min. It can be used as a reference for water consumption calculation. Sanitary Standard for Drinking Water (GB5749-2006)
According to the requirements of the General Hygienic Code for Food Enterprises (GB14881-1994), food production water (ice) must comply with the Sanitary Standard for Drinking Water (GB5749-2006).
Second, water treatment ozone generator swimming pool water treatment
Ozonation technology is very mature for swimming pool water treatment technology. It is very common in Europe and the United States. The international competition swimming pool is almost all treated with ozone technology. The swimming water standard in China requires the number of bacteria to be <1000 and the coliform group <100. , turbidity <5, currently mainly using chlorination, bleaching powder, copper acid and other means of killing, while the water quality meets the standard, but also caused secondary pollution, resulting in water quality eyelashes, irritating skin and other evils, especially liquid chlorine The potential threat in use is very high. Once the leak causes a large area of ​​poisoning pollution, it is fearful in use. Ozone technology has no such defects in the case of water quality standards. Ozonated water can also kill body bacteria for beauty. More economical is to reduce or eliminate drug consumption during use, reduce costs, and prolong the water quality shelf life. No small savings.
<1000, coliform group <100, turbidity <5, currently mainly using chlorine, bleaching powder, copper acid and other means of killing, in the water quality standards, but also caused secondary pollution, resulting in water quality It can irritate the skin and other evils, especially the potential threat of liquid chlorine. If it leaks, it will cause a large area of ​​poisoning pollution, which makes people feel fearful. Ozone technology has no such defects in the case of water quality standards. Ozonated water can also kill body bacteria for beauty. More economical is to reduce or eliminate drug consumption during use, reduce costs, and prolong the water quality shelf life. No small savings. ?
The ozone treatment technology of swimming pool water is basically the same as the treatment of drinking water, and its popular application needs to be improved in economic and cognitive level. What needs to be mastered is that after using ozone, the indoor swimming pool basically does not need drug assistance. The open-air swimming pool may cause some algae to grow under high temperature. This is because although ozone has algae-killing function, there are many varieties of algae, which cannot be completely killed. The situation usually occurs in the intense high temperature weather of the sun, and a little bit of acid copper can be used at this time.
Third, water treatment ozone generator aquaculture water treatment
Ozonation treatment of aquaculture water is extremely beneficial to the growth of fish, shrimp and crab, and the economic benefits are also very obvious. It has been widely used in Europe and America.
Because the culture water is rich in organic matter, the water quality is very easy to cause problems. The bacterial spread of the bacteria, viruses, fish and shrimps is also very rampant. In recent years, many shrimp ponds in the coastal areas have been produced and a large number of wastes have been formed.
In the treatment of aquaculture water, in addition to sterilizing and inhibiting the infection and spread of virus and fish, it can also decompose organic matter, remove COD and BOD substances, and is a good measure for improving water quality due to its coagulation effect. . In recent years, water pollution is serious. Polluted water causes diseases and a large number of deaths in fish. The ozone can kill NH3, SO2 and red tide toxins, and harmful substances. This shows how important ozone technology is to the promotion of aquaculture.
It has been reported in foreign countries that the treatment of aquaculture water with ozone can increase the yield of fish ponds by more than 30%, and the shrimp ponds can increase the yield by more than 60%. For the comparison test of fish, shrimp and crab seedlings, the survival rate is increased by more than 90%. Ozone, generally for the virus water that has caused harm, the ozone injection concentration of 0.5-1.2mg/L can kill all bacteria in the water. If it is a preventive effect, 0.5-0.7mg/L is enough.
Fourth, water treatment ozone generator circulating cooling water treatment
Circulating cooling water is common in industry, such as power plants, fertilizer plants, and chemical plants. The central air-conditioning equipment that has arisen in recent years is also inseparable from circulating water. In recent years, due to the discovery of a gram-negative pathogen that is extremely harmful to the human body in circulating cooling water, people are paying more and more attention to the treatment process of circulating cooling water. In the late 1970s, the United States conducted a large number of studies on ozone treatment of circulating cooling water, which proved that ozone has many advantages such as corrosion inhibition, scale inhibition, sterilization, algae elimination, water saving, pollution-free, etc., and the treatment cost is lower than the traditional treatment method. Therefore, ozone treatment circulating cooling water has broad prospects.
V. Water treatment ozone generator industrial wastewater treatment
Ozone is widely used in industrial wastewater treatment. Commonly used are phenol, cyanide and printing and dyeing wastewater treatment. Ozone can rapidly decompose cyanide in cyanide salt. The reaction is two steps. First, the highly toxic CN- is oxidized to CNO-, and then further oxidized to CO2 and N2, which can reduce the toxicity of toxic waste water by about 100 times. Ozone treatment of phenol-containing wastewater, the degradation rate of phenol is related to the amount of ozone added and time, and the higher the PH value in the reaction, the faster the reaction, and the smaller the ozone consumption. Ozone has the ability to decolorize all dye wastewater except disperse dyes. It can destroy the hair color or color-promoting genes in the dye to achieve the decolorization effect. A domestic experiment showed that when the chroma is as high as 1800-2500 times and the COD is 1100-1800mg/L, under certain conditions, the ozone can decolorize by 99% in 15min and the COD removal rate is close to 90%. When the degree of industrial wastewater is different, when calculating the dosage of ozone, the data is generally obtained through experiments.
Sixth, water treatment ozone generator composite ozone water treatment
Although ozone is extremely oxidizing, it has certain limitations. Ozone is not a panacea. In sewage treatment, it is difficult to oxidize and remove ozone (especially at low concentrations) for certain organic or intermediate products. This goes back to the four basic functions of oxidation, sterilization, decolorization and deodorization of ozone. Therefore, for some complex water treatment, ozone is effective as an important link. Complex sewage is combined with biochemical method and photocatalysis method. Or drug assistance is necessary. Even if drinking water, its mud and sand and impurities should be solved with filtration technology.
Seven, water treatment ozone generator high concentration ozone water generation
1, sterilization and disinfection:
(1) Food factories and pharmaceutical factories need to perform over-flow immersion sterilization on the surface of raw materials and other materials to form a sterile raw material surface (the packaging container can be disinfected and sterilized by high-concentration ozone gas contact). Concentrated juice can be made as long as the fruit can be aseptically cleaned.
(2) In the processing of aquatic products - before freezing packaging, through high-concentration ozone water spray sterilization or over-flow immersion sterilization, the sanitary indicators of aquatic products are perfectly controlled, avoiding the use of chloride to bring residual chlorine Exceeded the problem.
(3) In the production process of liquid food processing (such as beverages, juices, etc.) and pharmaceutical factories, high-concentration ozone water can be used for soaking and rinsing of pipelines, production equipment and containers to achieve efficient sterilization. Bacterial viruses on the surfaces of pipes, equipment and containers are washed and killed, which is very simple and easy. That is, there is no dead angle, and the discharge and residue of harmful substances caused by other chemical disinfectants are avoided, and the ozone has no residual and secondary pollution.
(3) It can be widely used in hotels, hotels, and canteens for the sterilization of tableware, fruits and vegetables, as well as the disinfection of children's toys and surfaces.
2, pesticide degradation: can be widely used in public dining canteens, fruit and vegetable processing plants, food processing plants, etc., used to remove harmful substances such as pesticides, fertilizers, food additives.
3. Water treatment: It can be widely used in anti-algae and sterilization of industrial water, sterilization and disease prevention of culture water, deodorization, decolorization and sterilization in sewage treatment process.
4, food preservation: can be widely used in refrigeration plants, food processing plants, livestock slaughter plants and other units in the production process of raw materials and finished products storage, preservation, disinfection process.
5, purification and cleaning:
(1) Can be widely used in hotels, hotels, saunas, hospitals, pharmaceuticals, food and other industries to wash clothes
(2) It can be widely used in the cleaning and cleaning of public places, toilets and production sites.
Note: Calculation of ozone demand: the amount of ozone required for water treatment g / h = 1.06 coefficient × ozone dosage g / m3 × water volume m3 / h
This calculation method is not certain; it may change due to different water quality.