Chemical
Disinfection
by
Ozone
It is a powerful oxidising agent and highly unstable. It must be manufactured on site by passing dry air through a high voltage high frequency electrical discharge. It has a more rapid effect than chlorine in destroying viruses and bacteria including spores. It is also effective in eliminating compounds that give objectionable taste and color to water.
The treatment with ozone should leave 1-2 mg/l of residual ozone. But ozone usually leaves very low level of residuals and thus there is no protection against new contamination of the water after disinfection. The high installation and operation costs further reduce its use as a disinfectant
