Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
Options
A. 15 days
B. 30 days
C. 60 days
D. 90 days.
Correct Answer
90 days.
More questions
1. At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be :