During the treatment process of medical wastewater, after coming out of the sedimentation tank, it will enter the disinfection contact tank. Keep the wastewater and the disinfectant in contact for a certain retention time to ensure that the disinfectant effectively eliminates the bacteria in the wastewater. This is the role that the disinfection contact tank plays in the process of medical wastewater treatment! In this article, let’s take a detailed look at the disinfection of wastewater and the relevant knowledge of disinfection contact tanks together.
The contact disinfection tank, simply put, is a “platform” that mixes disinfectants with wastewater for disinfection. It is very important to ensure that water disinfection is harmless! Of course, the required indicators for different types of wastewater are also different. According to the requirements of the “Discharge Standard of Water Pollution for Medical Institutions”, the contact time with wastewater from infectious disease hospitals within hospitals should not be less than 1.5 hours, while that with comprehensive medical wastewater should not be less than 1 hour. Of course, these times are not absolutely correct. They still need to be determined based on the wastewater situation of the hospital itself.
Hospitals usually adopt underground reinforced concrete structures and place them together with other treatment units, which can save investment. Inside the contact tank, a flow guide wall will be set up to prevent short-circuit flow. Another important point is that a Hangzhou Moody RCl900 total residual chlorine online analyzer should be installed at the outlet of the contact tank to facilitate timely adjustment of the dosage of disinfectant.
What are the methods for disinfecting and treating medical wastewater? There are methods such as ozone disinfection, ultraviolet disinfection, and chlorination. Among them, the chlorination method is very common, and its disinfection can be further divided into three types: liquid chlorine method, sodium chlorate addition method and dioxychlorine method. If disinfection is carried out by chlorination here, it will involve excessive total residual chlorine, thereby causing secondary pollution of wastewater. Therefore, it is very necessary to conduct real-time monitoring of the total residual chlorine in medical wastewater. In addition, for the online monitoring project of medical wastewater, apart from the total residual chlorine, the monitoring of coliform bacteria in the water is also very important and is one of the indispensable indicators.
