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在水中使用紫外線輻射

Use of UV radiation in water 

It is an effective and environmentally friendly method of sterilization, commonly used in water filtration systems for both households and industries. UV radiation helps make water safe from pathogens without the use of chemicals.


The principle of UV radiation in disinfecting

  • Ultraviolet (UV) radiation is in the wavelength range of 200–400 nanometers.
  • UV radiation for disinfection primarily uses a wavelength of 254 nanometers (UV-C)
  • UV-C will destroy the DNA or RNA of microorganisms such as bacteria, viruses, and protozoa, preventing them from reproducing or causing disease.


Advantages of Using UV Radiation in Water

  1. Safe for health and the environment
    • No chemical residues, such as chlorine or other chemicals
    • Does not change the taste or smell of the water
  2. High efficiency in killing germs
    • Can eliminate a variety of germs, such as
      • Bacteria (E. coli, Salmonella)
      • Virus (Hepatitis A, Norovirus)
      • Protozoa (Giardia, Cryptosporidium)
  3. Easy to use and low maintenance
    • The UV water filtration system has a simple structure.
    • The main maintenance is to replace the UV lamp, which lasts for 8,000–10,000 hours.
  4. fast
    • Disinfecting with UV radiation can be done in just a few seconds.


Limitations of Using UV Radiation in Water

  1. Do not eliminate chemicals or heavy metals
    • UV can only kill germs, but it cannot remove chemicals such as lead or toxins in water.
  2. Water must be clear and clean before disinfection.
    • Water that is cloudy or contains suspended particles will reduce the effectiveness of UV radiation.
    • Therefore, a preliminary filtration system is required before using UV.
  3. Must rely on electricity
    • The UV radiation system requires electricity to operate, which may be a limitation in areas without electricity.
  4. No residual effects
    • Unlike chlorine, which leaves residual substances in the water to prevent new contamination, UV radiation has no effect on preventing contamination after passing through the system.


Examples of UV radiation use in water

  1. Household water filtration system
    • Used for drinking water to eliminate pathogens and maintain water quality
  2. Water filtration system
    • Some countries use UV in conjunction with other water treatment processes, such as sedimentation and filtration.
  3. Food and Beverage Industry
    • Used to disinfect water used in the production process
  4. Swimming Pool and Spa
    • Use UV to help disinfect in conjunction with chlorine or saline.
  5. wastewater treatment
    • Used in the final stage of water treatment to eliminate pathogens before releasing the water back into nature.


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Precautions for Using UV Systems

  1. Install in the appropriate position
  • The UV system must be installed after other filtration systems, such as sediment filters.

ตรวจสอบและบำรุงรักษา

  • The UV tube must be clean and free of sediment or dirt.
  • You should replace the UV bulb when it reaches the end of its lifespan.

ระมัดระวังแสง UV ต่อร่างกาย

  • Do not stare directly at the UV lamp as it may be harmful to your eyes and skin.


Summary

The use of UV radiation in water treatment is a safe, effective and environmentally friendly method. It is suitable for disinfecting drinking water, utility water and various industrial applications. However, it should be used in conjunction with other filtration systems to obtain the highest quality water. 


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