Talking About The Application Of Medium-pressure Ultraviolet Rays From The Low Chlorination Demand

Swimming places usually use chlorine-containing disinfectants to disinfect pool water, but chlorine disinfectants also produce some harmful substances when disinfecting. Hypochlorination is produced in this context.The “low chlorination” of swimming pools is not about not using chlorine preparations for disinfection, or simply reducing the amount of chlorine preparations. Instead, while ensuring the sterilization needs of the swimming pool, through reasonable means and equipment, reduce the generation of combined residual chlorine (also called chloramine) and disinfection by-products in the swimming pool, increase the use of available chlorine, and reduce the use of chlorine preparations .

Classification of “chloride” in swimming pools

Available chlorine: disinfection, continuous disinfection in the swimming pool
Trichloramine: The smell of “disinfectant” that pervades the swimming pool is the volatile trichloramine.
Trichloramine has a strong stimulating effect on swimmers’ eyes and upper respiratory tract. Studies have shown that 43.3% of people will have dry skin, itching, dry eyes, congestion and pain after swimming. More than 25% of swimmers in the United States suffer from asthma.
Trichloromethane: also known as chloroform, is the most typical by-product of chlorine disinfection. There are more than 100 by-products of chlorinated disinfection in swimming pool water, and most of them have a clear risk of cancer.
When studying the exposure pathways of chlorinated disinfection by-products in swimming pool water, WHO has selected four groups of people, children, adults, athletes, and lifeguards as research subjects. The results show that the main exposure pathway for chlorinated disinfection by-products into the human body is through skin absorption And inhalation through the respiratory tract, the exposure into the human body through swallowing pool water is relatively small. The study found that the concentration of trihalomethanes in exhaled breath before and after swimming was 7 times that of before swimming.

The key to achieving “low chlorination” of medium-pressure ultraviolet

Due to the hazards of chloramine and chloroform, “low chlorination” disinfection of swimming pools is an inevitable trend in future development.

The medium-pressure ultraviolet swimming pool disinfection system is the right-hand man to help the swimming pool achieve “low chlorination”.

01What is a medium pressure UV sterilizer

Medium-pressure ultraviolet light is a kind of ultraviolet light source. The pressure of the inert gas filled in the tube is equal to atmospheric pressure, 0.2Mpa-0.4Mpa, which is 100 times that of low pressure. It can emit multi-wavelength ultraviolet light with a wider wavelength range, and the wavelength range is 200nm It has a very high optical density between -400nm.

Common medium pressure UV systems include: reactors, special light sources, ballasts, cleaning systems, and control systems.

02Medium-pressure ultraviolet effect:

1- Continuous decomposition of chloramines

Medium-pressure ultraviolet can decompose various chloramines, especially trichloramine can only be removed by medium-pressure ultraviolet.

At the same time, the ultraviolet photolysis system can simultaneously produce free radicals such as hydrogen atoms, water and electrons. These free radicals with strong oxidizing effect can oxidize organic substances (urea, sweat, etc.), block the production of trichloramine, and reduce available chlorine. Consumption.

According to Ruilang’s testing data, under certain conditions, the removal rate of chloramine can reach 80% for medium-pressure ultraviolet equipment.

2-Medium pressure ultraviolet can decompose chloroform

In the UV degradation system, there are two main ways for the degradation of halogenated disinfection by-products:

One is to use disinfection by-products that have absorption in the ultraviolet spectrum for direct photolysis;

瑞朗中压紫外线去除三氯甲烷

Second, chloroform can also be decomposed through the photo-oxygen reaction model.

Third,Medium pressure ultraviolet rays can effectively kill viruses, bacteria and anti-chlorine microorganisms, and reduce the pressure of chlorine disinfection.

Medium-pressure ultraviolet can effectively kill all bacteria and viruses, and can permanently inactivate chlorine-resistant microorganisms, such as Legionella pneumophila, Escherichia coli, Pseudomonas, Cryptosporidium, Amoeba and bacteria, etc. , Ultraviolet light achieves the inactivation effect by destroying the DNA and DNA repair enzymes of these microorganisms.

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Talking about the application of medium-pressure ultraviolet rays from the low chlorination demand