Various unit operations exist in a sewage treatment plant. These would include

1. screening

2. grit removal

3. secondary sedimentation

4. aeration

5. primary sedimentation

The correct sequence of these operations is

- 1
  
  1, 2, 3, 4, 5
- 2
  
  1, 2, 5, 4, 3
- 3
  
  2, 1, 4, 5, 3
- 4
  
  2, 1, 4, 3, 5

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