Question

Explain any two methods used for water purification

Answer 1

The methods used include physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination and the use of electromagnetic radiation such as ultraviolet light.

Answer 2

1. Distillation : Water is purified by distillation for chemical purposes.
Water is placed in flask 'A' and is heated. The vapours condense on passage through condenser. Pure water is collected in the flask below condenser .
2. By treatment of water : water is treated for drinking purposes. This process involves sedimentation of bigger particles at the bottom of the tank, filtration of the decanted water and chlorination of the water.