Precautions for the Design of UV Sterilizers

At present, there are many UV sterilizers on the market, so what kind of UV sterilizer is of good quality and has a significant sterilization effect? If you want to have a sterilizer with significant sterilization effect on water bodies, then the design of the sterilizer is very important.

Here are the points that must be considered when designing a high-quality UV sterilizer:

Ⅰ. The choice of UV lamp type

There are three types of UV tube lamps: low pressure UV lamps, medium pressure UV lamps, and high pressure UV lamps. Among them, the low pressure UV lamp has the highest sterilization efficiency, and 38% of the input power is converted into 254nm UV radiation with the strongest bactericidal effect on bacteria. Under the same conditions, the efficiency of medium pressure and high pressure UV lamps is only 8%, so generally sterilizers use low pressure UV lamps as the radiation source. The UV rays radiated by low pressure UV lamps (UV sterilizer tube) are almost all in the sterilizing UVC band of 254nm, while the UV rays radiated by medium pressure and high pressure UV lamps are mostly in the UVC and UVB UV bands, which are not very effective in sterilization. There are two main shapes of low pressure UV lamps: straight tube type and H tube type. There is little difference in the service life and UV radiation efficiency of the two lamps. Disinfection lamp supplier suggests that the service life and radiation efficiency of the straight tube type low pressure UV lamp are generally 10% better than that of the H tube type lamp.

Ⅱ. The design of the cavity of UV sterilizer

When we have selected the type of ultra violet tube, in order to maximize the sterilization power of UV rays, the key lies in the design of the cavity of the UV sterilizer. For each type of bacteria, there is a minimum dose of UV radiation above which the bacteria are killed or incapacitated. Therefore, the design of the cavity should ensure that the time and dose of UV radiation that the water flowing through is exposed to are sufficient to kill bacteria. Specifically, the volume of the cavity should be large enough. It is best to make the water flow through the UV radiation area for more than three seconds. The closer the distance between the water and the UV lamp, the better, so that the UV radiation intensity of the lamp is above 30000um/cm2, so as to ensure the bacterial killing rate of 99%. If the intensity of UV radiation is very strong, the time for the water to flow through the UV radiation area of the cavity can also be reduced. The UV radiation dose in the cavity can be increased by increasing the number of waterproof UVC light in the cavity. In order to make full use of UV radiation, the design of the cavity should ensure that the light-emitting part of the UV lamp is located between the water inlet and outlet.

There are three common sterilizer designs:

1. Single UV lamp

2. Multiple UV lamps

3. Open UV lamps