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Ozone Equipment Swimming Pool Water Disinfection Application


Advantages of using ozone in swimming pools 1. Ozone and its secondary products (such as hydroxyl) have the strongest bactericidal and virus inactivation effects, which can effectively prevent the spread of infectious diseases. Experiments have proved that the effect of the same concentration of ozone on killing bacteria and viruses is 600 times that of chlorine. -3000 times. When the ozone concentration is 1mg/l, the inactivation of fecal E. coli only takes 5 seconds, and it takes 15,000 seconds to achieve the same effect with the same concentration of chlorine.

2. Ozone is an internationally recognized environmentally friendly green fungicide that will not cause any secondary pollution to the environment, while chlorine preparations will react with organic matter in water to generate a variety of chlorinated organic compounds, such as chloroform, chloroform, etc. These substances are recognized carcinogenic mutagens. When people swim, these toxic substances will be absorbed by the human body (the human body can absorb 500 milliliters of water per hour in the water). Chlorinated organic compounds in the water can also irritate the eyes and skin, causing red eyes and rashes.

3. Chlorinated organic compounds and chlorine gas and other toxic gases evaporated from the water gather above the swimming pool and are not easy to disperse, which will damage people's respiratory organs and seriously affect people's health. However, the use of ozone will not cause such problems at all. 4. The hypochlorous acid and its derivatives produced by chlorination seriously corrode the water treatment system and the equipment and structures in the museum such as grids and heating. 5. Ozone is the strongest oxidant, which can effectively decompose humus in water, oxidize iron and manganese ions in water, and decompose tiny organisms that scatter light in water, thereby greatly improving the clarity of water and making water appear beautiful blue. Chlorine preparations have no such effect.

In order to make the water blue, copper sulfate is often added to swimming pools using chlorine preparations, which is extremely harmful to humans. 6. After adding chlorine preparations, it will inevitably lead to changes in the pH value of the water, which will make people feel uncomfortable, so it is necessary to add alkaline or acidic substances to neutralize it. Ozone is a neutral substance and will not cause such problems.

Ozone can ensure the stability of water quality during high passenger flow and high temperature season. When high temperature and high passenger flow, the water quality is often poor. At this time, if chlorine preparation is used, it needs to be added in large quantities, which will bring a series of side effects, such as Changes in pH value, irritation to the respiratory tract and human body, etc.; and a large amount of ozone has no such side effects. 7. The use of an ozone generator can greatly reduce the difficulty of management and operation of the water treatment process. At the same time, the ozone generator has a high level of safety, while chlorine preparations are dangerous during transportation, storage and use. 8. Ozone can decompose organic matter in water and has a micro-flocculation effect, so under normal passenger flow, no flocculant is required.

9. Under certain conditions of use, such as countercurrent circulation, no activated carbon filter tank, no need to add chlorine preparations, flocculants, and pH regulators, ozone can be used as the only chemical for water treatment. Application methods of ozone in swimming pools 1. Traditional methods The traditional theory of ozone disinfection of swimming pools believes that: ozone is a very strong oxidant and is toxic, so Absolutely do not allow ozone to enter the swimming pool. Because the specific gravity of ozone is greater than that of air, if it is separated from the water, it will float on the water surface to form a higher concentration of ozone layer, which is easy to be inhaled by people and cause poisoning.

Therefore, before the water reacts with ozone and returns to the swimming pool, it must go through the deozone device to prevent the remaining ozone from entering the swimming pool. The residual chlorine is between 0.3 and 0.6ppm. In swimming pool water treatment, the dosage of ozone is 0.6-1.0mg/l. The traditional ozone disinfection method for swimming pool water treatment has the following characteristics: ◆There must be a large-volume ozone reactor to ensure that the contact reaction time between ozone and water is not less than 2 minutes; Less than 0.4mg/l; ◆Use activated carbon to remove all remaining ozone before entering the pool; ◆After ozone disinfection, add chlorine disinfectant to make the residual chlorine reach 0.3-0.6mg/l.

In practical application, the above method has the following problems: ◆Ozone utilization rate problem; the traditional swimming pool ozone disinfection process needs to remove the remaining ozone. The specification requires that the concentration of ozone dosing is around 1.0mg/l, and the concentration of residual ozone is greater than 0.4mg/l. The remaining 0.4mg/l of ozone is removed without being used, which means that the used ozone is only about 0.6mg/l. The rest of the ozone is wasted. Moreover, after the ozone is removed, chlorine needs to be added as a long-term disinfectant.

◆Infrastructure investment issues: According to the traditional swimming pool circulating water ozone disinfection method, the contact time between ozone and water is preferably more than 3 minutes. If the shortest contact time is 2 minutes, for a standard pool (about 2400m3), the water treatment cycle The flow rate is 400m3/h, and the flow rate in 2 minutes is 13.3m3. According to the requirements, the filtration rate of the activated carbon filter tank is 30m/h, which requires a filtration area of ​​13.3 m3 activated carbon filter tank, which will greatly increase the area of ​​the machine room, and at the same time, the cost of the ozone system will increase by more than 30%. In fact, if the ozone is not removed, these problems may be solved. Therefore, many units at home and abroad have carried out research and application of this method.

2. Theoretical analysis of the ozone disinfection method without removing the ozone The traditional swimming pool ozone disinfection method believes that ozone has certain toxicity, so it is required to remove all the ozone in the pool before the ozone enters the swimming pool, so as to prevent the ozone from harming the human body. We know that the toxicity of substances is related to concentration. When the concentration of ozone in the air is greater than 0.1mg/l, it can stimulate the human respiratory organs. Below this concentration, it has little effect on the human body.

The actual test shows that when the ozone dosage is 1.0mg/l, the highest ozone concentration in the pool will not exceed 0.1mg/l. Some data point out that when the ozone concentration of swimming pool water is below 0.15 mg/l, it is harmless to the human body, and the actual situation is the same. What needs to be emphasized is that toxicology tests show that at the same dose, the toxicity of ozone is lower than that of chlorine. If ozone is harmful to humans at this concentration, then chlorine is more harmful to the human body.

Analysis and research abroad show that (limited to space, this article does not make a specific introduction): ◆It is theoretically feasible to directly add ozone to the swimming pool water treatment and disinfection method; Among them, all ozone is a free active molecule, which can play a disinfection role; ◆Because ozone will attenuate in water and air, and the half-life is short, so it will not produce the accumulation of ozone concentration; ◆The solubility of ozone in water is much larger Due to the amount of ozone added, the ozone in the water will not be precipitated in large quantities and will not cause harm to the human body. ◆In order to prevent ozone from harming the human body, the traditional ozone disinfection method stipulates the maximum residual concentration of ozone in water; in the non-deozonation disinfection method, in order to ensure the disinfection effect of ozone, the minimum residual concentration of ozone should be specified, and the concentration of ozone should not be Less than 0.05ppm,. ◆For the non-deozonation disinfection method, the reasonable ozone dosage and cycle period should be determined according to the actual test within the range of the highest residual ozone concentration and the lowest residual ozone concentration.

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