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Drinking Water from Lake Tahoe is Treated with Ozonization

TitleDrinking Water from Lake Tahoe is Treated with Ozonization
Author/CreatorCobourn, John; Purdy, Shelly; Segale, Heather M.
Related item(s)Press Release available at
Date Original2004-12-21
Summary/DescriptionLake Tahoe Report Segment #97 - "Drinking Water Ozonation" (Air Date: December 21, 2004). Segment covers how Incline Village is using the low-cost yet highly effective method of ozonation to treat its water supply.
SubjectWater -- Purification -- Ozonization
LocationLake Tahoe (Calif. and Nev.)
Tahoe, Lake (Calif. and Nev.)
CollectionThe Lake Tahoe Report
Original PublisherLake Tahoe Environmental Education Coalition (
Electronic PublisherUniversity of Nevada, Reno - Department of Teaching and Learning Technologies
Ordering and Permissions InformationFor more information, contact the University of Nevada Cooperative Extension, or 775-832-4138.
Date Digital2005-03-14
RelationRequires Windows Media Player
Resource TypeMoving Image
Contributing InstitutionUniversity of Nevada, Reno
TranscriptionSegment 97: Drinking Water Ozonation Air Date: December 21, 2004 Tease @ 13:25 "Most people think of ozone as a bad thing. Here at Incline Village they're using ozone to treat their water. I'm Shelly Purdy, I'll have the story on the Lake Tahoe Report." Anchor Intro: The Incline Village General Improvement District is using ozone to treat their community's drinking water. In tonight's Lake Tahoe Report, shelly Purdy explains how this low-cost yet highly effective method works. ((TAKE PKG)) ((Track 1)) This is all you can see of the process of making ozone…a few tiny sparks of electricity deep inside a specially designed ozone generator. ((sot @ 8:13 Dan St. John, Incline Village GID)) "Probably the most complex part of the operation is the ozone generation itself. The ozone molecule is oxygen 3. As you know the air we breathe is O2. So we make ozone from oxygen because you can't go to the store and buy a bottle of ozone. It doesn't last." ((s/u @ 12:58 Shelly Purdy)) "This is where the ozone is made. It's made by pumping 9000 volts of electricity through tubes of pure oxygen." ((track 2)) By zapping the gasified liquid oxygen with high voltage electricity…ozone gas is created. Once the gas is made, it's mixed with the water. ((sot @ 7:23)) "…The ozone gas is introduced to the water and allowed to mix and allowed to remain in contact with the water for a specified duration and during that time the ozone is a very effective oxidant." ((track 3)) Ozone is such a powerful disinfectant that it can kill even the most troublesome of pathogens like giardia and cryptosporidium. The only problem with ozone is can be very harmful to the environment. That's why once the ozone is used to disinfect the drinking water, a chemical is added to deactivate any residual ozone. Also, any extra ozone gas that collects in the system is run through an ozone destruction unit. No ozone is ever released into the atmosphere. Treating their drinking water with ozone has helped the Incline Village GID save money, lower the amount of chemicals they use in their drinking water and produce a high quality water for their customers. With the Lake Tahoe Environmental Education Coalition, I'm shelly Purdy for KOLO NC8. Anchor Tag: One side note…a small amount of chlorine is added to Incline's water after it goes through the ozonation process. The chlorine is needed to keep the water pure as it moves through the community's pipeline system.

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