The flow sheet of the kiquid stream of a sewage treatment scheme consists of

1. trickling filter

2. primary settling tank

3. grit chamber

4. screen chamber

5. secondary settling tank

The correct sequence of these units in the sewage treatment scheme of a liquid stream is

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

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