Some people might ask, are chlorine disinfectants used for disinfection? How could there still be any harm? After you understand it, you won’t think like this anymore. In this article, we will have a brief understanding of the relevant knowledge about residual chlorine.

What is residual chlorine? It is the chlorine added during the disinfection process. After coming into contact with sewage and wastewater for a period of time, the harmful substances in the water are eliminated, and the remaining chlorine is called residual chlorine. Because it is difficult to add exactly the same amount of chlorine disinfectant as the number of harmful substances such as bacteria and organic matter inside during the application process, it is inevitable that there will be either too little or too much. However, with the extensive use of chlorine, by-products will be generated, which have toxic and carcinogenic effects. So seeing this, we should understand that the presence of residual chlorine in water can also cause concern!

Why does residual chlorine exist in drinking water? That is due to environmental pollution, which causes a large number of harmful substances such as bacteria in water to multiply. Therefore, in order to inhibit and eliminate these bacteria, a large amount of chlorine is added during the treatment of these sewage and wastewater for sterilization. The indicator that needs to be monitored in drinking water is residual chlorine (free ion residual chlorine).

Besides, disinfection is a common occurrence in hospitals. At this time, there is also less monitoring of residual chlorine. In the medical wastewater online monitoring, the total residual chlorine is detected, which mainly includes free residual chlorine and combined residual chlorine. The instrument used to monitor this indicator is called the “Total Residual Chlorine Online Analyzer“, with the model being RCl900. It is one of the main products developed by Hangzhou Modi.