There are various disinfectants used for disinfecting wastewater, such as chlorine dioxide, active oxygen, and chlorine gas as mentioned in this article. To ensure the safety of water usage, it is necessary to carry out proper wastewater disinfection. In this article, we will explore the characteristics of chlorine gas disinfection for wastewater and the issues related to detection indicators.
Let’s start with chlorine gas disinfection. It involves adding chlorine gas or hypochlorite to the water for disinfection. The reaction process for this disinfection is: Cl2 + H2O = HCl + HClO (hypochlorous acid), ClO- + H2O = HClO + OH-. Additionally, HOCl and ClOCl- are collectively known as free chlorine, with HOCl having a better disinfection effect. When discharged into water bodies, chlorine reacts with organic nitrogen, ammonia nitrogen, etc. in the water, generating inorganic chloramines and organic chloramines, which are called combined chlorine. At this point, the disinfection effect is relatively poor. There is also total residual chlorine, which refers to the sum of effective free chlorine and combined chlorine. Of course, chlorine disinfection is not only affected by reactions with other substances, but also by factors such as time, dosage, and water quality.
Nowadays, the commonly used chlorine addition systems include chlorine generators, mixing equipment, contact tanks, and chlorine cylinders, among others.
What are the Characteristics of Chlorine gas Disinfection for Wastewater?
The significant advantage of using chlorine gas is that it is cost-effective, has strong bactericidal power, and has mature technology with simple processes. However, there are also concerns such as storage safety, which is prone to leakage, and if there is excessive total residual chlorine in the water, it will react with some substances, generating pathogenic and harmful substances, resulting in many concerns in the process of drinking water use.
As mentioned above, excessive total residual chlorine can cause harm. At this time, the RCl900 Total Residual Chlorine Online Analyzer plays a significant role. Through this instrument, the dosage of chlorine gas is monitored in real time and controlled within the qualified range. This instrument is mainly used for monitoring medical wastewater.
