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Acid regression stage of sludge digestion at a temperature 21°C extends over a period of______________?
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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
Correct Answer:
90 days
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Last Updated:
August 25, 2020