Ozone Water Purifiers
Types of Water Treated
Ozone water purifiers for Point of Use, Point of Entry (POU/POE), and small system applications need to address three types of waters which may contain undesirable contaminants: Surface water, Ground water, and Municipal water supply. The first two involve the same types of contaminants as are treated by all municipalities, and experience with ozone purification in these settings translates directly to installation of small scale systems and POU/POE systems.
Municipal water treatment processes actually produce some pollutants due to the use of chlorine (see below). These pollutants can be removed at the POU by specific treatment methods, and ozone can help, but ozone alone is not effective in removing these substances.
Two common water treatment tools, activated carbon and chlorine, deserve special mention:
OZONE AND ACTIVATED CARBON FILTERS
Activated carbon filters have a definite place in water purification systems, as they are the principal and most effective way to remove insoluble matter from water. However, used by themselves, they have serious disadvantages.Activated carbon will not inactivate virus, bacteria, or cysts, such as those that cause dysentery. Carbon filters must be serviced on a regular basis, or they can become saturated with bacteria and other contaminates. Depending on the severity of the application, this can be a costly and ongoing expense. However, if water has been purified by ozonation prior to passage through an activated carbon filter, the only remaining task of the filter is to remove insoluble, non-toxic matter from the water, and such filters will need to be serviced less frequently.
Ozotech X-1 Pilot Scale Treatment System
OZONE VS. CHLORINE
Ozone is rapidly replacing chlorine in many applications as a chemical free alternative. Chlorine produces disinfection byproducts, such as chloroform and other trihalomethanes, and haloacetic acids, all of which are listed as cancer-causing chemicals under the Safe Drinking Water Act. Ozone has equally been realized as a major cost advantage over chlorine when used in conjunction with filtration, reducing or eliminating chemical dependency.
As noted in Business Week, May 7, 1984:
Ozone’s chief advantage over chlorine is that it not only kills bacteria, but it also destroys viruses and waterborne parasites.Furthermore, ozone removes smells and color from water, [leaving] no residual. By the time the water comes out of the tap, the ozone is gone without a trace. This problem (of chlorine-produced disinfection byproducts) is especially serious for areas that obtain their water from rivers or reservoirs rather than wells. Such surface water contains high amounts of organic material from plants and animals, which react with chlorine to produce such chemicals as chloroform, a known carcinogen.