Water Treatment – MCQ
⭕ A. Plain chlorination
⭕ B. Pre chlorination
⭕ C. Post chlorination
⭕ D. Double chlorination
📚 Explanation:
**Post chlorination** is the normal and most widely adopted standard method of applying chlorine to water.
🔹 It is carried out **after all treatment processes** (sedimentation, filtration, etc.).
🔹 Ensures **final disinfection** before water enters the distribution system.
🔹 Provides protection in case of **future contamination** in pipelines.
Why not Pre or Double Chlorination?
• Pre-chlorination is used only as a special treatment step.
• Double chlorination is used in rare cases where extra protection is required.
**Post chlorination** is the normal and most widely adopted standard method of applying chlorine to water.
🔹 It is carried out **after all treatment processes** (sedimentation, filtration, etc.).
🔹 Ensures **final disinfection** before water enters the distribution system.
🔹 Provides protection in case of **future contamination** in pipelines.
Why not Pre or Double Chlorination?
• Pre-chlorination is used only as a special treatment step.
• Double chlorination is used in rare cases where extra protection is required.
👉 Therefore, the correct answer is: C. Post chlorination
Key Points on Chlorination:
- Post chlorination: Standard method done at end of treatment.
- Ensures disinfection: Protects against contamination in distribution.
- Commonly used in municipal water supply.
