VPE 511: Environment and Environmental Hygiene (2+1)

OZONISATION

• Ozonisation is practiced chiefly for the sterilization of swimming bath water.
• It is generally preferable to chlorination for this purpose as no objectionable taste or smell is imparted to the water.
• It is of interest to note that the efficient sterilization by ozone is due in part to the presence of impurities in the form of oxides of nitrogen which are more toxic to bacteria than ozone itself .
• The wider use of ozonisation is prevented by the high initial cost of the ozone production plant and the high consumption of electric current by the plant in use.