Question

Chlorination of treated waste water is required for

• A. Killing all microbes
• B. Removing suspended materials
• C. Complete breakdown of organic matter
• D. All of the above

Answer 1

Answer: (A)

Killing all microbes

Chlorination is the process of treating the water with chlorine to kill the water-borne microbes that can possibly cause diarrhoea, typhoid, jaundice, amoebiasis etc. It is performed during the tertiary treatment step. Chlorine compounds like sodium hypochlorite are added to water to give effect to the process.

A. Chlorination kills the microbes.

B. Suspended particles are removed by filtration.

C. The complete breakdown of organic matter occurs by decomposition during the secondary treatment.

Hence, the correct answer is 'Killing all microbes'