Do you know what
residual chlorine is? Residual chlorine refers to the chlorine that is put into drinking water to remove the residual chlorine that is consumed by the action of microorganisms, bacteria, organic matter, inorganic matter, etc. in the water. At present, more than 80% of water plants in the world still use chlorine to disinfect water, so municipal tap water needs to ensure a certain amount of residual chlorine to ensure the microbial safety indicators of drinking water. 01Why is chlorine added to tap water for disinfection? Tap water should have been a hygienic and safe drinking water, but due to environmental pollution, harmful substances such as bacteria in the water have grown in large numbers. In order to inhibit and kill bacteria in water and ensure that tap water meets safety and hygiene requirements, chlorine is added during water treatment to inactivate pathogenic microorganisms in water and avoid water-borne infectious diseases. Due to the high cost performance of chlorine gas, the addition of chlorine is widely used for disinfection in the domestic water treatment industry. 02 What are the hazards of excess chlorine? Residual chlorine in water not only sterilizes and disinfects, but also harms the cells of the human body. Chlorine can also destroy nutrients such as vitamins and minerals in vegetables, fruits and grains, seriously affecting the absorption of nutrients by the human body. Tap water with excessive chlorine content is boiled to easily generate san chloride, which is recognized as a strong carcinogen. Clinical manifestations of chlorine poisoning: acute poisoning. In mild poisoning, the patient may experience dizziness, headache, chest tightness, drowsiness, staggering gait, etc.; in severe poisoning, the person may be unconscious, or lethargic, or even coma, convulsions, and even death in severe cases. Chlorine in tap water is directly harmful to any pores with pores such as skin, nostrils, mouth, lungs, hair, eyes, etc. Children's tender skin and hair are particularly sensitive to this. Some swimming pools are disinfected by chlorine. If the residual chlorine exceeds the standard, the child will develop a rash after swimming and get sick. 03 What is the national standard for residual chlorine in water? Using chlorine to disinfect tap water has both advantages and disadvantages. However, tap water has to go through a long process of municipal pipe network, community pipe network, high-rise water tanks, etc. from the factory to the homes of citizens. Live bacterial germs. Simply put, tap water must contain a certain amount of residual chlorine, but it must not exceed the standard. The requirements for disinfectant indicators in my country's 'Drinking Water Hygienic Standard GB5749-2006' are: if chlorine gas or free chlorine preparations are used as disinfection methods, then The residual amount in the factory water should not be lower than 0.3mg/L, not higher than 4mg/L, and the residual amount at the end of the pipe network should not be lower than 0.05mg/L; if monochloramine is used for disinfection, the total chlorine in the factory water should not be low 0.5mg/L, not higher than 3mg/L, and the balance at the end of the pipe network is not lower than 0.05mg/L.
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