Question

Find the correct sequence :

• A. [(A)] \( \text{River Water} \)
• B. [(B)] \( \text{Flocculation Chamber} \)
• C. [(C)] \( \text{Sedimentation Tank} \)
• D. [(D)] \( \text{Filters} \)

Hint:

\textbf{Public Health Engineering: Water Treatment.} Remember the basic steps involved in conventional water treatment plants: coagulation/flocculation, sedimentation, filtration, and disinfection. The order of these steps is crucial for effective removal of impurities.

Answer 1

The Correct Option is D

The correct sequence for the treatment of river water to obtain clear water for storage typically involves the following steps: % Option (A) River water (A): This is the raw water source. % Option (B) Flocculation Chamber (B): Chemicals (coagulants) are added to the river water to clump together small suspended particles into larger, heavier flocs. % Option (C) Sedimentation Tank (C): The flocculated water flows into a sedimentation tank where these heavier flocs settle down due to gravity, separating them from the water. % Option (D) Filters (D): The partially clarified water then passes through filters (usually sand filters) to remove any remaining suspended particles, including fine flocs and microorganisms. % Option (E) Clear water storage (E): The filtered water is now clear and is stored in reservoirs for distribution. Disinfection (e.g., chlorination) usually occurs before or during this storage phase to kill any remaining pathogens. Therefore, the correct sequence is River water \(\rightarrow\) Flocculation Chamber \(\rightarrow\) Sedimentation Tank \(\rightarrow\) Filters \(\rightarrow\) Clear water storage, which corresponds to option (4): A \(\rightarrow\) B \(\rightarrow\) C \(\rightarrow\) D \(\rightarrow\) E.