Disinfection

◆Disinfection◆

Disinfection : It is the process of killing pathogenic bacteria.

Methods:

i) Boiling of water :

•Most effective method of disinfection of water.

•cannot be used for huge quantities of public water supplies.

•cannot take care of the future possible contaminations.

•used only for Domestic purposes emergencies.

ii) Treatment with excess limes.

• Effectively kills the bacteria. but cannot safe guard the future pollution.

• Enough lime is added to water to raise, its  pH value to 9.5 or more, thereby most of the bacteria will be killed.

• Recarbonation is necessary. The process of removal of excess lime before. it is supplied to public is know as Recarbonation.

iii) Ozone.

• Ozone is a more powerful disinfectant than Chlorine.

• Ozone Is more costly than chlorine.

• Does not provide residual protection against  rccontnminalion.

• Cannot be stored.

• Used for disinfection of water on a small scale such as for swimming pool waters.

Iv) Iodine and Bromine pills.

• Compared to chlorine . iodine provides longer lasting pmtcctiun against pathogens and reduced offensive tastes and odours.

• used for water supply for army troops, private plants. swimming pools.

• Cannot be uscd for public water supply as it is costly.

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