The most commonly used disinfection method for drinking water is

? The commonly used methods for disinfection of drinking water include ultraviolet ray, chlorine gas, chlorine dioxide disinfection and ozone disinfection. Ultraviolet rays are generally used in domestic water tanks and places with small water flow, so their application is limited. So at present, chlorine, chlorine dioxide and ozone are mainly used for disinfection.

As a quantitative index to measure the efficacy of disinfection and sterilization, the concentration-time product constant (ct) is defined as the product of the disinfection concentration (C) and the time (T) required to kill certain bacteria according to the specified killing rate. The smaller the value, the shorter the time required to kill the same amount of bacteria, indicating that the stronger the disinfectant, the better the effect. A large number of quantitative analysis data prove that compared with the three disinfectants, the CT value of chlorine gas is 3-4, chlorine dioxide is 1.2, and ozone is only 0.0 12-0.4, and its efficiency is obvious (see the table below). According to the relevant data, through the comparative study of ozone and the above two disinfectants, the following conclusions are drawn: (1) from the disinfection effect, ozone > chlorine dioxide > chlorine gas; From the mutagenicity of disinfection water, chlorine > chlorine dioxide > ozone. Therefore, that advantage of ozone disinfection can be shown.

However, when ozone is used for drinking water treatment, the ozone disinfection equipment must obtain the Hygiene License for Drinking Water Hygiene and Safety Products approved by the National Health Bureau before it is allowed to disinfect drinking water. Therefore, users must confirm with the manufacturer whether they have this qualification when purchasing ozone disinfection equipment.