Which of the following are claimed as advantageous in respect of aerobic sludge digestion as compared to anaerobic sludge digestion?

1. lower BOD concentration in supernatant liquor

2. production of a sludge with excellent denaturing propensity

3. greater production of methane

4. lesser operatio cost

5. lesser capital cost

Select the correct answer using the codes given below.

Codes:

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

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