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
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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.