UPSC Civil Service Exam Questions - Civil Engineering Questions and Answers

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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 dewatering propensity.
3. Greater production of methane.
4. Lesser operating cost.
5. Lesser capital cost.
Select the correct answer using the codes given below :

1, 2 and 4

2, 3, 4 and 5

3, 4 and 5

1, 2 and 5

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