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How Ultraviolet Light Works |
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A UV lamp purifier should be installed to provide safe drinking water. A UV lamp is the only method of water purification that is acceptable to avoid boil orders. Applications
of UV water treatment include: residential, breweries, water stores, restaurants,
municipalities, cooling towers, marine, hydroponics, aquaculture, etc... |
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Ultraviolet light (UV) is at the invisible, violet end of the light spectrum. The water treatment industry uses a high-powered form of UV light called UV-C or "germicidal UV" to disinfect water. |
How does UV light work for water purification?UV-C rays (photons) penetrate microorganisms and becomes absorbed by the DNA of the pathogen in the water being treated. The DNA is altered in such a way that the pathogen cannot reproduce and is essentially killed and cannot cause infection. This process of DNA modification is called inactivation. UV-C rays will destroy a minimum of 99.99% of harmful microorganisms, including E. coli, Cryptosporidium and Giardia. Unlike chemical disinfection the organisms are unable to develop any immune mechanism against UV light. The degree of UV inactivation of pathogens is directly proportional to the UV dose applied to the water.UV dose is the product of UV light intensity and exposure time and is expressed in mJ/cm2. NSF International has established a UV dose of 40 mJ/cm2 as the minimum UV dose required to ensure that all bacteria, viruses, Giardia and Cryptosporidium are killed or inactivated to a safe level. |
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The Advantages of UV Disinfection
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What size UV unit do I need?To maximize the
efficiency of the UV unit, pre-treatment is advisable. The most common
pre-treatment methods are: Deciding on the capacity of unit needed is fairly simple... For point-of-entry (whole house) system estimate the flow rate needed according to these guidelines:
To estimate the flow rate of water into your home, follow these steps:
Example: if it takes 20 seconds to fill a 1 gallon container, the flow rate is 3 gallons per minute |
Factors Affecting UVThe effectiveness of a UV system in eliminating microbiological contamination is directly dependent on the physical qualities and/or clarity of your water supply.
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UV energy required for 99.9% destruction of various microorganismsThis table shows the amount of ultraviolet energy required, (at 253.7nm wavelength), for 99.9% destruction of various microorganisms measured in microwatt seconds per centimeter squared. Most lamps hould be replaced annually, but check your user manual for exact replacement frequency to ensure proper intensity output.
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All prices are in Canadian dollars, are subject to change and may be subject to taxes. Freight and/or brokerage fees may be added. Return policy - All equipment must be in original packaging. 20% restocking fee applies. No returns on used filters/membranes/bulbs. Return shipping is the responsibility of the purchaser. |
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