When the UV dose is insufficient, the pathogen cannot be effectively killed. The pathogen may repair itself under the mechanism of photosynthesis or “dark repair”, and has no long-lasting sterilization ability, which cannot solve the problem of re-contamination in the pipe network after disinfection.
Biologicals, minerals, suspended matter in the water will be deposited on the surface of the UV lamp shade, which will affect the sterilization effect. Preventive measures should be taken to prevent the UV lamp tube from scaling, and regular cleaning should be carried out.
Turbidity and TSS have a greater impact on ultraviolet disinfection. In the application of low-pressure ultraviolet lamps, the maximum limit of the TSS of the incoming water is 30mg/L. When the TSS is not higher than 20mg/L and less than 10 mg/L, it will be able to Achieve good sterilization effect.
After disinfection, the continuous sterilization ability cannot be maintained, and at the same time, the power consumption is large, and the disinfection cost is high.