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Do you know where you need to use a residual chlorine detector?

by:BOQU     2023-03-14
In order to maintain the bactericidal effect, the residual chlorine in the effluent should always be kept at 0.5-1mg/l, and the residual chlorine at the end of the water supply network should also be kept at 0.05-0.1mg/l. An instrument that measures the residual chlorine content in effluent water is called a residual chlorine analyzer. The online residual chlorine analyzer is used in the following places: ①On-line monitoring of residual chlorine content in water plant effluent; ②On-line monitoring of residual chlorine content in sewage treatment plant effluent; ③On-line monitoring of residual chlorine content analysis in circulating cooling water; ④On-line monitoring of residual chlorine content in boiler feed water treatment monitor. When using sterilized tap water as boiler feed water for desalination, residual chlorine in the tap water must be removed. Because the presence of residual chlorine will destroy the structure of the ion exchange resin, making its strength worse and easy to break. Free Chlorine - Chlorine gas generates hclo and clo- in water, and the sum of hclo and clo- is called 'free chlorine'. Among them, free chlorine has a strong killing effect on microorganisms such as bacteria, and is an effective antiviral component in free chlorine, so hclo is also called 'effective free chlorine'. Combined chlorine—Before the free chlorine exerts its bactericidal effect, due to the dissolved ammonium ions and various impurities of organic matter in the water, these impurities will first react with the free chlorine and consume a part of the free chlorine. For example, free chlorine reacts rapidly with ammonium ions in solution to form monochloramine and dichloramine. Free chlorine also reacts with organic compounds (such as proteins and amino acids) over a long period of time to form various organochlorine compounds. Chloramines and organochlorine compounds are collectively referred to as combined chlorine. Total chlorine - Combined chlorine plus free chlorine is the total chlorine in the solution, called total chlorine. Among these substances, only free chlorine is an effective disinfectant, and compound chlorine has almost no bactericidal ability. Only when the above chlorine consumption requirements are met, there will be excess free chlorine to kill bacteria. The amount of chlorine added—the amount of chlorine added during chlorination disinfection is called the amount of chlorine added, and the amount of chlorine added should include two parts: chlorine demand and residual chlorine. Chlorine demand is the amount of chlorine required to kill bacteria and oxidize organic and reducing substances. Residual chlorine amount - refers to the amount of residual chlorine remaining in water to inhibit the re-growth of residual bacteria in the water, called residual chlorine or residual chlorine. Some people have visited free chlorine called residual chlorine, this statement is not accurate, the remaining free chlorine after killing bacteria is residual chlorine.
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