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Question
Match List–I with List-II and select the correct answer using the codes given below in the lists
      List–I                                             List–II
(Treatment units)                     (Detention time) 
A. Grit chamber                         1. Six hours
B. Primary sedimentation          2. Two minutes
C. Activated sludge                   3. Two hours
D. Sludge digestion                  4. Twenty five days
 
Codes:
A    B    C    D
A.
3    1    4    2
B.
2    3    1    4
C.
2    1    3    4
D.
1    2    3    4
Answer ( Option B)

2    3    1    4

Solution

Detention time for different types of Treatment units are as follows
Treatment Unit Detention time
Grit chamber 30-60 second
Primary sedimentation 2-2.5 hour
Sludge digestion 20-30 days
Activated sludge 4-6 hour
Oxidation pond 2-6 weeks
Septic tank 12-36 hour

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