Multiple choice

Consider the following unit processes commonly used in water treatment: rapid mixing (RM), flocculation (F), primary sedimentation (PS), secondary sedimentation (SS), chlorination (C) and rapid sand filtration (RSF). The order of these unit processes (from first to last) in a conventional water treatment plant is

  1. PS$\rightarrow$RSF$\rightarrow$F$\rightarrow$RM$\rightarrow$SS$\rightarrow$C
  2. PS$\rightarrow$F$\rightarrow$RM$\rightarrow$RSF$\rightarrow$SS$\rightarrow$C
  3. PS$\rightarrow$F$\rightarrow$SS$\rightarrow$RSF$\rightarrow$RM$\rightarrow$C
  4. PS$\rightarrow$RM$\rightarrow$F$\rightarrow$SS$\rightarrow$RSF$\rightarrow$C
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D Correct answer
Explanation

 $\text{Order of treatment is}\\ PS \rightarrow RM \rightarrow F \rightarrow SS \rightarrow RSF \rightarrow C \\ \text{Rapid mixing is the process by which coagulant is throughly mixed with raw water for effective flocculation.}$

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