6. How UV disinfection works DNA Replication UV light instantly alters the DNA of pathogens rendering them unable to reproduce (sterile)
7. UV Dose is the product of : Intensity X Residence Time (Quantity of UV Light per (Contact Time in UV Reactor) unit Area Falling on a Surface) UV Dose is expressed in mJ/cm 2 (Millijoules per centimeter square) mWsec/cm 2 (Milliwatt second per centimeter square) μ Wsec/cm 2 (Microwatt second per centimeter square) UV Dose Calculation
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13. Crossfire Technology versus Conventional UV design Incorporating self-cleaning and UV Intensity sensors Conventional Technology Crossfire Technology
14. “ Light in a pipe” The Challenges of Conventional UV Technology
27. Broadest Range of Pre-treatment Conditions Conventional “ Light in a Pipe ” systems Current Hallett and Upstream Systems Hardness <5 Grains Up to 50 Grains Iron <.3 mg/l Up to 3 mg/l No/Low Flow Overheating – lower UV intensity No Effect – 100% UV intensity UVT Must be 75% to over 90% to achieve advertised dose As low as 50% for “real world” effectiveness Flow Control Flow Restrictor is an option – may not be safe All UV Pure potable water systems have flow restrictors – Safe!
28. Belvedere Winery Healdsburg Sonoma, CA US Multiple Hallett 30’s treat Potable water for the tasting room and all water used in the wine-making process
29. Milking parlour wash water application Dairy Farmers of Ontario Agriculture Canada test
Inefficient Single pass light, UV light lost when photon hits pipe wall 2. UV Shadowing - Large particles in water create shadow with no UV light 3. Quartz fouls with minerals and metals System needs to be drained and quartz removed and cleaned with acid. 4. Quartz breakage - Quartz pieces hard to remove – potential danger Lamp breakage may cause mercury in water 5. Overheating - No Water Flow During long periods with no flow - causes low UV lamp output
Biologically safe drinking water, readily accessible, worldwide, one glass at a time. To ensure Pure, Safe Water – ALWAYS!
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