uv water disinfection systems
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Ultraviolet Water Disinfection Systems
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• Ultraviolet (UV) water disinfection systems utilize light in the 200-300 nanometer range to disinfect water.
• Most modern UV water disinfection systems operate at 254 nanometers.
UV Water Disinfection
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How It Works Part I• Exposure to UV light between 200 and
300 nanometers alters the DNA of bacteria and microorganisms.
• Bacteria and microorganisms become unable to reproduce or infect other organisms.
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How It Works Part II• DNA and RNA molecules absorb the UV
light and dimers form along DNA strands.
• The dimers disrupt the RNA nucleic material, preventing cellular replication.
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Required Conditions• For ultraviolet water disinfection systems
to be effective, water must be “essentially” free of the following:
• Turbidity• Silt• Color• Iron• Manganese• Organic Matter
• UV water disinfection will not succeed if anything shields the microorganism from exposure to the UV light.
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Required UV Dosage • UV dosage must be sufficient to inhibit the
DNA of the microorganism.
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Class A Disinfection• The ANSI and NSF require a UV dosage of
38 mWs/cm2 at 254 nanometers for Class A POU and POE disinfection:
• 38mWs/cm2 = 38 milliwatt seconds per square centimeter
• Class A POU = Point of Use• Class A POE = Point of Entry
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Equipment Setup• Water flowing through high purity glass
tubes is exposed to UV light at 254 nm.
• The size of the UV light used is based on flow rate and the required length of exposure for disinfection.
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Benefits of UV Disinfection• Benefits of disinfecting water with an
ultraviolet disinfection system include:
No Byproducts No Hazardous Chemicals Environmentally Friendly Effective Microorganism Control High Flow Rate Disinfection No Impact on Chemical Makeup No Impact on pH Levels Low Maintenance
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Custom Ultraviolet Water Disinfection Systems
Call: 800-999-4195Email: [email protected]
© 2016 www.WaterProfessionals.com