Civil Engineering - Waste Water Engineering - Discussion

21. 

Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

[A]. 15 days
[B]. 30 days
[C]. 60 days
[D]. 90 days.

Answer: Option D

Explanation:

No answer description available for this question.

Shubham Siddharth Nayak said: (May 25, 2020)  
Acid fermentation-15 days (half month).

Acid regression-90 days (3 months).

Alkaline fermentation-30 days (1months).

Total time required for complete digestion in digestive unit=4 and half months.

Fahad said: (Oct 6, 2020)  
Thanks @Shubham Siddharth Nayak.

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