Question

Chlorination (treatment with chlorine) is done in ___________.

• A. Primary Treatment
• B. Secondary treatment
• C. Tertiary Treatment
• D. All of these

Answer 1

The correct option is C

Tertiary Treatment

The correct option is C.

Explanation of the correct option :

1. Tertiary treatment is the final stage of water treatment and is a chemical process.
2. To eliminate phosphorus and nitrogen from the water, chemicals are added.
3. The use of chlorine kills bacteria and other pathogens. After chlorination, the water is fit for drinking.

Explanation of the incorrect options:

Option A:

1. Primary treatment is a mechanical process that screens and settles large particles from wastewater using vertical bars and grit chambers.
2. After the screening, water is pumped into sedimentation tanks.

Option B:

1. Secondary treatment is a biological stage that involves the breakdown of organic matter obtained from primary treatment using microorganisms to produce biogas.
2. To speed up the treatment of water, water is pumped into aeration tanks, and the air is pushed through them.

Final answer: Chlorination (treatment with chlorine) is done in tertiary treatment.