E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

The usefulness of online residual chlorine analyzer

by:BOQU     2023-04-03
In order to maintain the effect of killing bacteria, the amount of residual chlorine in the effluent should always be kept at 0.5-1 mg/l, and the residual chlorine at the end of the water supply pipe network should also be kept at 0.05-0.1 mg/l. An instrument that measures the amount of free chlorine remaining in effluent water is called a 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 in circulating cooling water; ④Boiler On-line monitoring of residual chlorine content in feed water treatment. When the online residual chlorine analyzer uses sterilized tap water as boiler feed water for desalination treatment, the 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 easily broken. 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 bacteria and other microorganisms, and is an effective anti-virus component in free chlorine, so hclo is also called 'effective free chlorine'. Combined chlorine—Before the free chlorine has a bactericidal effect, because there are various impurities such as ammonium ions and organic substances dissolved in the water, these impurities will first react with free chlorine and consume part of the free chlorine. For example, free chlorine quickly reacts with ammonium ions in solution to form monochloramine and dichloramine. Over a longer period of time, free chlorine also reacts with organic compounds (such as proteins and amino acids) to form various organochlorine compounds. Chloramines and organochlorine compounds together are called combined chlorine. Total chlorine - Combined chlorine plus free chlorine is the total amount of chlorine in the solution, called total chlorine. Among these substances, only free chlorine is an effective disinfectant, and combined chlorine has almost no killing ability. Only when the above-mentioned chlorine consumption needs are met, there will be excess free chlorine to kill bacteria. Chlorine addition—the amount of chlorine added during chlorination disinfection is called chlorine addition, and the amount of chlorine addition should include two parts: chlorine demand and residual chlorine. Chlorine demand refers to the amount of chlorine required to kill bacteria and oxidize organic and reducing substances. Residual chlorine amount - refers to the amount of chlorine remaining in water to inhibit the reproduction of residual bacteria in water, called residual chlorine or residual chlorine. Some people refer to free chlorine as residual chlorine, which is not accurate, and the remaining free chlorine after killing bacteria is residual chlorine.
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