Question:
Arrange the following operations in correct order for treating raw surface water to make it suitable for drinking purpose:
A. Screening
B. Filtration
C. Sedimentation
D. Disinfection
Choose the correct answer from the options given below:
Arrange the following operations in correct order for treating raw surface water to make it suitable for drinking purpose:
A. Screening
B. Filtration
C. Sedimentation
D. Disinfection
Choose the correct answer from the options given below:
A. Screening
B. Filtration
C. Sedimentation
D. Disinfection
Choose the correct answer from the options given below:
Show Hint
Mnemonic: "S-S-F-D" -> Screening, Sedimentation, Filtration, Disinfection. Disinfection is almost always the final step to ensure residual protection in the pipes.
Updated On: May 20, 2026
- A, D, C, B
- A, B, C, D
- A, C, D, B
- A, C, B, D
Show Solution
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The Correct Option is D
Solution and Explanation
Concept:
Water treatment follows a logical sequence to remove impurities of decreasing size and complexity, starting with large debris and ending with microscopic pathogens.
Step 1: Identify the initial stage.
The first step is Screening (A), which removes large floating objects like leaves, sticks, and plastic to protect the mechanical equipment in subsequent stages.
Step 2: Identify the clarification stages.
Following screening, Sedimentation (C) allows heavier suspended particles to settle at the bottom under the influence of gravity. This is often preceded by coagulation and flocculation.
Step 3: Identify the polishing and safety stages.
After settling, Filtration (B) removes the remaining fine suspended solids and some microbes. Finally, Disinfection (D) (usually chlorination) is performed to kill any remaining bacteria and viruses to ensure the water is safe for consumption.
Step 1: Identify the initial stage.
The first step is Screening (A), which removes large floating objects like leaves, sticks, and plastic to protect the mechanical equipment in subsequent stages.
Step 2: Identify the clarification stages.
Following screening, Sedimentation (C) allows heavier suspended particles to settle at the bottom under the influence of gravity. This is often preceded by coagulation and flocculation.
Step 3: Identify the polishing and safety stages.
After settling, Filtration (B) removes the remaining fine suspended solids and some microbes. Finally, Disinfection (D) (usually chlorination) is performed to kill any remaining bacteria and viruses to ensure the water is safe for consumption.
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