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[content] => Ozone is a gas, only by dissolving ozone into water, so that the water contains a certain concentration of ozone, and maintain a certain reaction time, can the purpose of sterilization and disinfection be achieved. The commonly used ways of mixing ozone and water are generally bubble method, jet method, mixing pump and so on.
Ozone has the formula O3 , an allotrope of O2 composed of three oxygen atoms. Ozone is chemically active and easily decomposes into oxygen. Its oxidizing capacity is very strong, and its oxidation capacity ranks second only to fluorine F2 in nature, higher than hydrogen peroxide, potassium permanganate, chlorine dioxide and other oxidants. Ozone relies on its strong oxidation to have good sterilization, decolorization, oxidation, deodorization function, in the conversion process with oxygen without secondary residue and secondary pollutants generation, which is the greatest advantage of ozone for environmental protection, drinking water treatment, food processing, medical treatment and other fields. In China's bottled water and bottled water purification production process, the health department has mandated the use of ozone sterilization treatment.
[**]n ozone generator is a device that converts oxygen into ozone. The generation technology of ozone is mainly simulated by the natural method of generating ozone, which is roughly three types: photochemical method, electrochemical method and corona discharge method. Corona discharge method to produce ozone is currently the most economical and commonly used method in the world, it is blocked by high-voltage corona dielectric, through high-energy ions to dissociate oxygen into oxygen atoms, oxygen atoms and oxygen molecules combined to form ozone.
[**]t present, there are many domestic enterprises producing ozone generators, with a wide variety of products and uneven quality, so the quality of choosing ozone generators plays a vital role in the sterilization effect of the entire water treatment. Water purification treatment generally adopts corona discharge ozone generator, and its structure generally consists of several parts, such as power supply system, generator (discharge chamber), gas source system, casing and control system. The following points should be paid attention to when choosing an ozone generator for water purification:
1. Have a product test report from the national quality inspection department;
2. Generally, the ozone generator with air gap discharge is used, and the "open" ozone generator with surface discharge is not suitable;
3. There should be a complete and renewable air drying treatment system;
4. With water cooling, do not choose an air-cooled ozone generator for water treatment;
5. The outlet gas concentration of the ozone generator > 8mg/L.
Ozone is a gas, only by dissolving ozone into water, so that the water contains a certain concentration of ozone, and maintain a certain reaction time, can the purpose of sterilization and disinfection be achieved. The commonly used ways of mixing ozone and water are generally bubble method, jet method, mixing pump and so on.
In order to make the water reach a certain ozone concentration, in addition to ensuring that the ozone generator has sufficient ozone production and concentration, it is also necessary to ensure the gas-liquid mixing efficiency. The CT value recommended by the ozone industry is 1.6, C is the water-soluble concentration of ozone (mg/L), T is the reaction time (min), and the most economical operation is the water-soluble concentration of ozone 0.4mg/L, and the reaction time is 4min.
The bubbling method is to pass the ozone gas produced by the ozone generator to the bottom of the oxidation tower or oxidation pool through the pipeline, and emit micro-bubbles through the micro-empty bubbler, and the bubbles dissolve the ozone in water in the process of rising. The efficiency of mixing ozone by bubbling method is generally 20-30%.
The oxidation tower bubbling used in general water purification treatment has the following characteristics:
1. The oxidation tower is generally made of stainless steel and has two windows with two split windows to observe the size and uniformity of the bubbles.
2. The oxidation tower is equipped with an anti-backflow device, that is, the ozone gas needs to go around the top of the oxidation tower and then enter the bubbler at the bottom of the tower, so as to prevent the water stored in the oxidation tower from entering the ozone generator by self-pressure after the ozone generator stops working.
3. The bottom of the oxidation tower is distributed, the bubbler is evenly distributed, the material is made of anti-oxidation titanium or corundum, and the filter pore size of the bubbler should be small in order to produce microbubbles.
4. Water is fed at the upper end of the oxidation tower, water is discharged from the lower side, and the water flows through the oxidation tower from top to bottom, forming a countercurrent with the ozone bubbles in the gas phase to improve the mixing efficiency.
5. There is an overflow port at the top of the oxidation tower to prevent imbalance of water inlet and outlet; There is a sewage outlet left at the bottom.
6. The middle and upper parts should be equipped with a liquid level display to facilitate the observation of the water level in the oxidation tower.
7. The size of the oxidation tower should ensure a large high-diameter ratio, even if the oxidation tower with a small amount of water is treated, its effective height is guaranteed to be not less than 2 meters.
The jet method is to form negative pressure under the action of high-speed water flow in the gas cavity in the jet, suck in ozone gas, and then crush the ozone gas with high-speed water flow to form microbubbles and mix with water. The efficiency of mixing ozone by jet method is generally 25-40%. The problems that should be paid attention to when using the jet method for gas-liquid mixing are as follows:
1. The inlet and outlet sections of the jet require a high pressure difference, most of which is not less than 0.2Mpa, and a booster pump is generally installed in front of the jet.
2. The intake section of the jet should have very reliable anti-backflow measures, and generally have double or triple protection devices.
3. The effluent of the jet cannot be directly filled, although it is possible that the water-soluble concentration reaches the specified value, but the reaction time is too short, which affects the sterilization effect.
4. The best application of the jet is to use it in conjunction with the reaction tank, the booster pump feeds water from the lower side of the reaction tank to supply the jet, and the effluent of the jet enters the reaction irrigation from the cutting direction of the lower side of the reaction tank, and the ozone is added in circulation, and the water flow with ozone bubbles spirals up in the reaction tank, increasing the mixing efficiency.
5. The jet and booster pump should be determined according to the gas outlet of the generator and the water pressure of the system, and the ozone generator selected for oxygen source can reduce the investment of the jet and booster pump due to the high ozone concentration and small gas output.
The mixing pump is generally vortex type, which forms a negative pressure in the pump, and the suction port inhales gas (or liquid), and gas-liquid, liquid-liquid mixing can be carried out through the stirring of multiple impellers. The common mixing pumps on the market are generally Niconi mixing pumps and gas-liquid mixing pumps produced by Southern Special Pump Factory. The efficiency of using mixing pumps to dissolve ozone is high, generally 40-70%. The problems that should be paid attention to when using mixing pumps for gas-liquid mixing are as follows:
1. When the gas-liquid ratio is 1:9, the mixing efficiency of the mixing pump is the best.
2. The actual water output of the mixing pump is the difference between the rated water output and the suction volume, when the suction volume of the mixing pump is increased, the water output of the pump is reduced accordingly.
3. When the mixing pump is installed, a regulating valve and a pressure gauge should be added to the inlet and outlet sections to adjust the optimal suction volume.
4. [**]fter mixing the pump out of the water, an exhaust tank or reaction tank should be added to discharge the microbubbles dissolved in water.
5. The mixing pump should not be connected to the main road, so that the mixing pump bears the two responsibilities of water supply and mixing, and it is difficult to ensure both effects at the same time.
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Ozone is a gas, only by dissolving ozone into water, so that the water contains a certain concentration of ozone, and maintain a certain reaction time, can the purpose of sterilization and disinfection be achieved. The commonly used ways of mixing ozone and water are generally bubble method, jet method, mixing pump and so on.
Ozone has the formula O3 , an allotrope of O2 composed of three oxygen atoms. Ozone is chemically active and easily decomposes into oxygen. Its oxidizing capacity is very strong, and its oxidation capacity ranks second only to fluorine F2 in nature, higher than hydrogen peroxide, potassium permanganate, chlorine dioxide and other oxidants. Ozone relies on its strong oxidation to have good sterilization, decolorization, oxidation, deodorization function, in the conversion process with oxygen without secondary residue and secondary pollutants generation, which is the greatest advantage of ozone for environmental protection, drinking water treatment, food processing, medical treatment and other fields. In China's bottled water and bottled water purification production process, the health department has mandated the use of ozone sterilization treatment.
[**]n ozone generator is a device that converts oxygen into ozone. The generation technology of ozone is mainly simulated by the natural method of generating ozone, which is roughly three types: photochemical method, electrochemical method and corona discharge method. Corona discharge method to produce ozone is currently the most economical and commonly used method in the world, it is blocked by high-voltage corona dielectric, through high-energy ions to dissociate oxygen into oxygen atoms, oxygen atoms and oxygen molecules combined to form ozone.
[**]t present, there are many domestic enterprises producing ozone generators, with a wide variety of products and uneven quality, so the quality of choosing ozone generators plays a vital role in the sterilization effect of the entire water treatment. Water purification treatment generally adopts corona discharge ozone generator, and its structure generally consists of several parts, such as power supply system, generator (discharge chamber), gas source system, casing and control system. The following points should be paid attention to when choosing an ozone generator for water purification:
1. Have a product test report from the national quality inspection department;
2. Generally, the ozone generator with air gap discharge is used, and the "open" ozone generator with surface discharge is not suitable;
3. There should be a complete and renewable air drying treatment system;
4. With water cooling, do not choose an air-cooled ozone generator for water treatment;
5. The outlet gas concentration of the ozone generator > 8mg/L.
Ozone is a gas, only by dissolving ozone into water, so that the water contains a certain concentration of ozone, and maintain a certain reaction time, can the purpose of sterilization and disinfection be achieved. The commonly used ways of mixing ozone and water are generally bubble method, jet method, mixing pump and so on.
In order to make the water reach a certain ozone concentration, in addition to ensuring that the ozone generator has sufficient ozone production and concentration, it is also necessary to ensure the gas-liquid mixing efficiency. The CT value recommended by the ozone industry is 1.6, C is the water-soluble concentration of ozone (mg/L), T is the reaction time (min), and the most economical operation is the water-soluble concentration of ozone 0.4mg/L, and the reaction time is 4min.
The bubbling method is to pass the ozone gas produced by the ozone generator to the bottom of the oxidation tower or oxidation pool through the pipeline, and emit micro-bubbles through the micro-empty bubbler, and the bubbles dissolve the ozone in water in the process of rising. The efficiency of mixing ozone by bubbling method is generally 20-30%.
The oxidation tower bubbling used in general water purification treatment has the following characteristics:
1. The oxidation tower is generally made of stainless steel and has two windows with two split windows to observe the size and uniformity of the bubbles.
2. The oxidation tower is equipped with an anti-backflow device, that is, the ozone gas needs to go around the top of the oxidation tower and then enter the bubbler at the bottom of the tower, so as to prevent the water stored in the oxidation tower from entering the ozone generator by self-pressure after the ozone generator stops working.
3. The bottom of the oxidation tower is distributed, the bubbler is evenly distributed, the material is made of anti-oxidation titanium or corundum, and the filter pore size of the bubbler should be small in order to produce microbubbles.
4. Water is fed at the upper end of the oxidation tower, water is discharged from the lower side, and the water flows through the oxidation tower from top to bottom, forming a countercurrent with the ozone bubbles in the gas phase to improve the mixing efficiency.
5. There is an overflow port at the top of the oxidation tower to prevent imbalance of water inlet and outlet; There is a sewage outlet left at the bottom.
6. The middle and upper parts should be equipped with a liquid level display to facilitate the observation of the water level in the oxidation tower.
7. The size of the oxidation tower should ensure a large high-diameter ratio, even if the oxidation tower with a small amount of water is treated, its effective height is guaranteed to be not less than 2 meters.
The jet method is to form negative pressure under the action of high-speed water flow in the gas cavity in the jet, suck in ozone gas, and then crush the ozone gas with high-speed water flow to form microbubbles and mix with water. The efficiency of mixing ozone by jet method is generally 25-40%. The problems that should be paid attention to when using the jet method for gas-liquid mixing are as follows:
1. The inlet and outlet sections of the jet require a high pressure difference, most of which is not less than 0.2Mpa, and a booster pump is generally installed in front of the jet.
2. The intake section of the jet should have very reliable anti-backflow measures, and generally have double or triple protection devices.
3. The effluent of the jet cannot be directly filled, although it is possible that the water-soluble concentration reaches the specified value, but the reaction time is too short, which affects the sterilization effect.
4. The best application of the jet is to use it in conjunction with the reaction tank, the booster pump feeds water from the lower side of the reaction tank to supply the jet, and the effluent of the jet enters the reaction irrigation from the cutting direction of the lower side of the reaction tank, and the ozone is added in circulation, and the water flow with ozone bubbles spirals up in the reaction tank, increasing the mixing efficiency.
5. The jet and booster pump should be determined according to the gas outlet of the generator and the water pressure of the system, and the ozone generator selected for oxygen source can reduce the investment of the jet and booster pump due to the high ozone concentration and small gas output.
The mixing pump is generally vortex type, which forms a negative pressure in the pump, and the suction port inhales gas (or liquid), and gas-liquid, liquid-liquid mixing can be carried out through the stirring of multiple impellers. The common mixing pumps on the market are generally Niconi mixing pumps and gas-liquid mixing pumps produced by Southern Special Pump Factory. The efficiency of using mixing pumps to dissolve ozone is high, generally 40-70%. The problems that should be paid attention to when using mixing pumps for gas-liquid mixing are as follows:
1. When the gas-liquid ratio is 1:9, the mixing efficiency of the mixing pump is the best.
2. The actual water output of the mixing pump is the difference between the rated water output and the suction volume, when the suction volume of the mixing pump is increased, the water output of the pump is reduced accordingly.
3. When the mixing pump is installed, a regulating valve and a pressure gauge should be added to the inlet and outlet sections to adjust the optimal suction volume.
4. [**]fter mixing the pump out of the water, an exhaust tank or reaction tank should be added to discharge the microbubbles dissolved in water.
5. The mixing pump should not be connected to the main road, so that the mixing pump bears the two responsibilities of water supply and mixing, and it is difficult to ensure both effects at the same time.
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