What are the hazards and solutions of residual chlorine

The hazards and solutions of residual chlorine: 1. The concept of residual chlorine Residual chlorine is the general term for free chlorine and combined chlorine remaining in water after a certain period of contact with chlorine. It means that after chlorine gas is put into water, in addition to consuming part of the chlorine gas together with bacteria, microorganisms, organic matter, inorganic matter, etc. in the water, there is still a part of chlorine gas, which is called residual chlorine. chlorine. 2. Classification of residual chlorine Residual chlorine can be divided into compound residual chlorine (referring to the compound of chlorine and ammonia in water, there are three kinds of NH2Cl, NHCl2 and NHCl3, NHCl2 is relatively stable and has good bactericidal effect), also known as compound residual chlorine; free residual chlorine Chlorine refers to ClO+, HClO, Cl2, etc. in water, which have fast sterilization speed and strong bactericidal power, but disappear quickly), also known as free residual chlorine; total residual chlorine refers to the sum of combined residual chlorine and free chlorine residual chlorine. Residual chlorine in tap water refers to free residual chlorine. 3. The harm of residual chlorine to the human body In order to ensure that the tap water meets the safety and hygiene requirements and avoid the occurrence of water-borne infectious diseases, disinfectants should be added to the tap water when purifying the water to inactivate the pathogenic microorganisms in the water. Due to its high cost performance, chlorine gas is widely used in the domestic water treatment industry. As an effective means of sterilization and disinfection, residual chlorine is still used by more than 80% of the water plants in the world. Therefore, a certain amount of residual chlorine must be maintained in municipal tap water to ensure the safety of microbial indicators in drinking water. However, when chlorine reacts with organic acids, many carcinogenic by-products are produced, such as chloroform. More than a certain amount of chlorine itself will cause a lot of harm to the human body, and it has an unpleasant smell. If the concentration of chlorine in tap water is too high, the main hazards are: ① It is very irritating and harmful to the respiratory system. ②It is easy to react with organic matter in water to generate carcinogens such as chloroform. ③Cause damage to skin cells and intercellular matrix, easily cause dry skin, chapped skin, acne, acne, aging, or changes such as keratinization of palms, thinning of nails, etc. ④If used as raw materials for production, it may have adverse effects, For example, when used in the production of rice wine products, it has a bactericidal effect on the yeast in the fermentation process and affects the wine quality. Chlorine gas is generally used to purify tap water, and residual chlorine will generate carcinogenic chloroform during the heating process. Long-term drinking will cause great harm to the human body. Especially in recent years, water pollution has become more and more serious, which directly leads to the increase of residual chlorine content in tap water. Therefore, drinking boiled tap water directly is not a healthy choice, and repurifying tap water is the key. Tap water purified by water purification equipment is called direct drinking water. On the basis of retaining the beneficial minerals to the human body, it absorbs harmful substances such as residual chlorine in tap water, and it is truly healthy water. Therefore, it is also very important to choose a suitable residual chlorine detection instrument.
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