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1. Water treatment ozone generation technology and supporting technology Water treatment ozone generation application technology is mainly divided into four major parts of the occurrence, cooling, drying, air-water mixing and electronic control systems, structural systems six major aspects of technology.
The unit of ozone concentration used for water treatment is generally calculated in mg/L, which is a thousand times worse than the air type commonly used in mg/m3. Therefore, it is known that water treatment requires high concentration and large amount of ozone to be applied, and ozone generation occurs. Quantity/hour, power consumption of load power, dryness of air source, product life, etc. are the main indicators.
Ozone generation in water treatment mostly uses air gap discharge method. Due to the concentration demand, its power consumption increases, and the temperature rise of the device is also inevitable. Temperature rise is a major factor that affects the generation of ozone and the life of the equipment, so cooling is generally required, mainly air cooling. There are two kinds of water cooling, some of which are solved by the cold air source. Which method is used depends on the design of the equipment.
In the same ozone generating parts and power supply conditions, the ozone output is directly proportional to the dryness of the air source, that is, the higher the dryness of the air source, the higher the amount/hour value. Therefore, the purification and drying of the air source is indispensable. , generally referred to as air source pretreatment or air source dryers, systems. At present, the main means of drying air source are freezing, dew condensation, chemical method, etc. The drying degree is calculated as the equivalent of air temperature. For example, -40°C refers to the drying degree of air source at -40°C.
Gas-water mixing device is an indispensable supporting technology for ozone for water treatment. Although ozone is soluble in water and its solubility is more than ten times higher than that of oxygen, it must adopt a technical means to fully contact ozone with water, and the contact area and time Ozone concentration and pressure are all determinants of mixing efficiency. At present, ozone and water are mainly mixed in the following ways:
(1) Helium gas method: This is a traditional and simple method. It uses ozone gas to compress and then uses certain foaming devices to allow ozone to form bubbles and make full contact with water. It is easy to see that the smaller and more bubbles are, The greater the depth, the better the effect.
(2) Jet flow method: Also known as the Venturi method, it uses the device to reduce the diameter and increase the flow velocity to form a secondary pressure suction when water flows in the pipe, and the ozone and water are mixed in the pipe. When this kind of device is installed, the jet device must be matched with the pipeline (according to the pipe diameter), and the second direction is that the water flow in the jet device cannot have back pressure to prevent the water from entering the sampling tank, and the third is that the jet device is extended. The pipeline must be more than 2.5m, the longer the efficiency is higher, the fourth is that the flow rate must reach a certain amount to ensure the formation of negative suction, and the fifth is that the device and the pipeline must be made of stainless steel or plastic to prevent the use of steel and iron to avoid ozone depletion and oxidation. corrosion. The jet method is more efficient, but the installation design and requirements should be quite strict.
(3) The negative suction method of the turbine is to add the gas path through the suction process of the water pump. When the water supply forms negative suction, the ozone is brought into the water with high efficiency. The principle is basically the same as the Venturi method and it is widely used. The installation requirements are almost the same as those of the Venturi method. It is necessary to pay special attention to the control of the gas volume. When the gas volume is large, it will affect the water supply to the pump.
(4) Mixing tower method This method uses a higher tower to spray water from the lower part of the tower to form a mist. The ozone gas is introduced from underneath and the water flow is formed in a backward direction, so that ozone gas and water are in full contact to form ozone. water. This method has two kinds of fillers and fillers. The material is very particular and the effect is also very good, but the cost is higher.
Electronic control is an indispensable part of the water treatment ozone generator. It is directly related to the start and stop of the equipment and its use. It is generally divided into three modes, automatic and numerical control. At present, there are few closed-loop controls, and the electronic control design is based on The requirements of a single machine may vary depending on the requirements.
In addition to assembling the above technologies together, the structural system also needs to consider the sealing of high-concentration ozone gas, avoid leakage and injury to the human body, and if necessary, provide catalytic treatment technology for the remaining ozone gas, which are all very strict.
2. Water Treatment Ozone Generation Technology Applications Drinking Water Treatment Ozonation The most widely used and most successful field is the treatment of drinking water. Ozone is used for drinking water treatment. It has good sterilization effect and no secondary pollution. It also has decolorization and deodorization, removing iron and manganese, oxidizing and decomposing 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 the coliforms are all zero. Western Europe, the United States, and other countries implement this standard. Therefore, the ozone water treatment products of the tap water supply company are widely used. In China, due to development, the economy is relatively backward. The national sanitary standard of drinking water is that the total number of bacteria is <100, and the coliform bacteria is <3. Most of them use bleaching powder, chlorination, and chlorine dioxide promoted in recent years. Sodium hypochlorite occurs equipment disinfection. Because the chlorine disinfection will produce chlorine derivatives causing secondary pollution, in which trihalomethanes are direct carcinogens, have been phased out in the treatment of drinking water in Europe and the United States. As far as the current price of domestic ozone generators is concerned, the prices of chlorine dioxide and sodium hypochlorite are similar or even low, but there is still a process of people’s understanding and the lack of funds for equipment renewal.
In 1996, the Ministry of Health issued a document requiring that secondary water supply must be equipped with disinfection facilities. Some units of self-provided wells must also be allowed to use water in compliance with the standard. Secondary water supply disinfection and treatment products are currently only available in two. Oxygen chloride, sodium hypochlorite and ozone generating equipment are used. Ozone water treatment has a strong competitive advantage and should be a mature market. The mineral water, purified water, and bottled water that have risen in recent years are the necessary markets for ozone technology products. It is difficult to leave ozone equipment to meet the standards.
Treatment of drinking water When using ozone equipment, the dosage of ozone is generally 1-3mg/L, and the contact time can be 10-15 minutes. It can be used as a reference when calculating the water consumption.
The swimming pool water treatment ozonation technology has been very mature in swimming pool water treatment technology. It is widely used in Europe and the United States and other countries. The international competition swimming pools are almost always treated with ozone technology. The swimming water standards in China require the number of bacteria to be less than 1000 and the coliform bacteria. <100, turbidity <5, currently using chlorine, bleaching powder, copper sulfate and other methods of killing, in the water quality at the same time, but also cause secondary pollution, resulting in water galvanic, irritating skin and other consequences, especially liquid chlorine The use of potential threats is large. Once leaked, it will cause large areas of poisoning pollution, making people nervous. In the case of water quality standards, ozone technology does not have any of the above defects. Ozonated water can also kill bacteria and make it more beautiful. It is more economical to reduce or eliminate drug consumption during use. The cost is reduced and the water quality shelf life is extended. The pen is not a small expense.
The ozone treatment technology of swimming pool water is basically the same as the treatment of drinking water, and its popularization and application need to be improved in economic and cognitive level. What needs to be grasped is that, after using ozone, the indoor swimming pool basically does not need drug assistance, and the open-air swimming pool may cause some algae to grow under high temperatures. This is because ozone has algae-killing function, but there are many algae species and it is impossible to kill them all. This situation generally occurs in the strong continuous high-temperature weather of the sun, when using a little copper sulfate.
The aquaculture treatment of ozonized aquaculture water is extremely beneficial to the growth of fish, shrimp and crabs, and its economic benefits are also very obvious. It has been widely used in Europe and the United States.
Because aquaculture water is rich in organic matter, water quality can easily cause problems. Bacteria, viruses, fish, and shrimps are also very wildly transmitted. In recent years, many shrimp farming ponds in the coastal areas have lost production and a large amount of waste.
In addition to sterilizing and inhibiting viral bacteria from infecting and spreading fish and shrimp, ozone can also decompose organic matter and remove COD and BOD substances in aquaculture water treatment. It is also a good measure to improve water quality because of its coagulation aid effect. . In recent years, water pollution has been serious, and pollution of water has caused diseases and large-scale deaths of fish, and ozone can kill harmful substances such as NH3, SO2 and red tide toxins. This shows how important ozone technology is to the breeding industry.
According to foreign reports, ozone-treated aquaculture water can increase fish production by 30% or more in fish ponds, and shrimp production in shrimp ponds can increase production by more than 60%. Contrasting experiments on fish, shrimp, and crabs have resulted in a 90% increase in survival rate and aquaculture water use. Ozone, which is generally a virus that has caused damage, can completely kill bacteria in water by injecting a concentration of 0.5-1.2 mg/L. If used as a preventive measure, 0.5-0.7 mg/L is sufficient.
Treatment of Circulating Cooling Water Circulating cooling water is common in industries such as power plants, fertilizer plants, and chemical plants. The central air-conditioning equipment that has emerged 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 increasingly concerned about the treatment of circulating cooling water. At the end of the 1970s, the United States conducted a large number of researches on the ozone treatment of circulating cooling water, which proved that ozone has many advantages such as corrosion inhibition, scale inhibition, sterilization, algae elimination, water saving, and no pollution, and the processing cost is lower than traditional treatment methods. Therefore, ozone treatment of circulating cooling water has broad prospects.
Industrial Wastewater Treatment Ozone is widely used in the treatment of industrial waste water. Commonly used treatments include phenol, cyanide, and printing and dyeing wastewater. Ozone can rapidly decompose cyanide in cyanide salt, and the reaction is a two-step process. First, the highly toxic CN- is oxidized to CNO-, and then it is further oxidized to CO2 and N2, which can reduce the toxicity of toxic waste water by about 100 times. Ozone can be used to treat phenol wastewater, and the degradation rate of phenol is related to the amount of ozone added and the time. The higher the PH value, the faster the reaction and the smaller the ozone consumption. Ozone can decolorize all dye waste water except for disperse dyes. He can destroy the hair dye or color-genes in the dye and achieve decolorization. A domestic experiment showed that when the chromaticity is as high as 1800-2500 times and the COD is 1100-1800 mg/L, under certain conditions, the decolorization rate of ozone can reach 99% in 15 minutes, and the removal rate of COD is close to 90%. Due to varying levels of industrial wastewater, calculations of ozone dosing typically yield data from tests.
Complex Ozone Water Treatment Technology Although ozone is extremely oxidizing, it also has certain limitations. Ozone is not a panacea. In wastewater treatment, it is difficult for some organic substances or intermediates to oxidize and remove ozone (especially at low concentrations). This has to be traced back to the four basic functions of ozone oxidation, sterilization, decolorization and deodorization. Therefore, for some complex water treatment, ozone is effective as an important link. The complex sewage is combined with biochemical methods and photocatalytic methods. Or drug assistance is necessary. Even drinking water, its sediment, impurities must be matched with filtration technology.
3, the conclusion
The use of ozone for water treatment is extensive, and the right medicine can receive satisfactory results.
Research on Application Technology of Water Treatment Ozone
Abstract : The difference between air treatment ozone generator products and air type is that it generally adopts a closed type structure and has a high concentration of ozone. After the occurrence of ozone, ozone is dissolved in water through a pipeline through a gas-water mixing device. Because of ozone generation conditions and component life requirements, generally require air pretreatment or the use of high concentrations of ozone gas source, this is mainly the production of ozone is closely related to the dryness of the air, so most are equipped with air source drying system.