Application of Residual Chlorine Analyzer in Automatic Chlorination Process

With the development of the times and the rapid development of science and technology, automated water treatment processes have been more and more widely used in the practice of small and medium-sized water plants across the country. The important process of automatic chlorine addition saves a lot of manpower and material resources, and more importantly, it can adjust the amount of chlorine added in time, which solves the time lag problem of adjusting the amount of chlorine added by detecting residual chlorine in chlorine gas. (Lag time is typically 2-3 hours). Application in the process of automatic chlorination In the process of water treatment, chlorination and disinfection are an important part of water quality control in water plants. The amount of chlorine added to water during disinfection can be divided into two parts: chlorine demand and residual chlorine. For the drinking water process, after chlorination, microorganisms inactivate and oxidize organic matter and reducing substances in the raw water, and the amount of chlorine consumed after a certain period of contact is called chlorine demand. In order to inhibit the reproduction of residual microorganisms in water, a small amount of residual chlorine should still be maintained in the pipe network. my country's drinking water hygiene standards stipulate that free residual chlorine in factories should not be lower than 0.3mg/L after 30 minutes of contact with water, and the tip of the pipe network should not be lower than 0.05mg/L. Although the residual chlorine content of the latter still has disinfection ability, it is not enough for recontamination disinfection and can be used as a signal of recontamination. This is especially important in the case of long branch networks with dead water ends. During chlorination disinfection, the amount of chlorine added should generally meet the required disinfection index for killing bacteria, the amount of chlorine consumed by oxidizing organic matter, and the amount of residual chlorine required to inhibit the reproduction of residual pathogenic bacteria. In the water. At the same time, if the dosage is too high, it is easy to produce carcinogens such as chloroform and tetrachloromethane. Therefore, it is very important to correctly control the amount of chlorine added in the water treatment process. Introduction and working principle In production practice, when the detection limit of the residual chlorine analyzer is set to 0mg/L, the corresponding output current is 4mA; the upper limit of the residual chlorine analyzer can be determined according to the amount of chlorine added in production practice. Generally, when the corresponding output current is 20mA, the residual chlorine value is set to 2.0mg/L. The chlorinator has a setting to control the residual chlorine value, which can be carried out according to the residual chlorine standard of factory water. According to the 'Drinking Water Sanitation Standard' (GB5749-2006), the excessive chlorine content in the factory water is ≥0.3mg/L, and the residual chlorine concentration in the water at the end of the pipe network is ≥0.05mg/L, which is harmless to the human body. Take the water plant in Gu'an County Industrial Park of the South-to-North Water Diversion Project as an example: the residual chlorine analyzer converts the detection signal into a current signal and transmits it to the chlorinator. After the chlorinator is detected, reduce the amount of the chlorinator until the signal residual chlorine value is 0.8mg. /L, otherwise the chlorinator will increase the amount of chlorine added, automatically adjust the amount of chlorine added during production, and control the residual chlorine in the filtered water to be stable at about 0.8mg/L, so as to ensure that the residual chlorine in the factory water is stable at ≥0.3 mg/L. within range.
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