In recent years, the environmental and safety issues caused by chlorine disinfection have attracted increasing attention from people. Due to the fact that chlorine disinfectants not only kill bacteria and viruses, but also form chlorinated amines and trihalomethanes (THMs) with urea and organic matter secreted by the human body. The volatility of amine chloride can cause a special odor in indoor swimming pools, which can irritate the mucous membranes of human eyes, ears, nose, and throat. THM has been confirmed to be carcinogenic to mice. The US Environmental Protection Agency (EPA) announced in 2001 that THM is harmful to health, stating that long-term consumption of water with excessive THM levels may lead to cancer in the lungs, liver, and central nervous system. THM in swimming pool water can pose certain health risks through human respiration and skin penetration.
In order to reduce the content of chloramines and trihalomethanes in swimming pool water and reduce their harm, methods such as coagulation sedimentation and activated carbon adsorption filtration can be used to remove them. The use of chlorine dioxide or ozone disinfection methods can completely solve the above problems.
1. Can reduce the formation of chlorination by-products such as trihalomethanes in water;
When the ammonia content in water is high, it does not react with ammonia, so its oxidation and disinfection effects are not affected;
3. Can kill pathogenic microorganisms and viruses in water;
4. The disinfection effect is not affected by the acidity or alkalinity of water quality;
5. After being treated with chlorine dioxide, the residual chlorine in the water is stable and long-lasting, with strong ability to prevent re pollution;
6. Due to its strong oxidation effect, it can remove color and odor from water and does not form a chlorophenol odor with phenols;
7. The removal effect of iron and manganese is better than that of chlorine. Of course, the chlorine dioxide disinfection method also has some drawbacks:
8. Chlorine dioxide is explosive and must be prepared on-site for immediate use;
9. The preparation of chlorine dioxide with low chlorine content is more complex and its cost is higher than other disinfection methods;
10. The raw materials for preparing chlorine dioxide are sodium chlorate and hydrochloric acid, which are oxidizing or corrosive substances and also pose safety issues for storage and transportation;
11. Safety of the preparation device itself. The safety of the storage, transportation, and preparation process of raw materials limits their widespread application in swimming pool water treatment.
