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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 29 / 47

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Ozone

First used in 1893 at Oudshoon

Used in 40 WTPs in US in 1990 (growing use since then), but more than 1000WTPs in European countries

Increased interest as an alternative to free chlorine (strong oxidant; strong microbiocidal activity; perhaps less toxic DBPs)

A secondary disinfectant giving a stable residual may be needed to protect water after ozonation, due to short-lasting ozone residual.

Colorless gas; relatively unstable; reacts with itself and with OH- in water; less stable at higher pH

Formed by passing dry air (or oxygen) through high voltage electrodes to produce gaseous ozone that is bubbled into the water to be treated.

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