Acid regression stage of sludge digestion at a temperature 21°C extends over a period of Options: A . &nbsp15 days B . &nbsp30 days C . &nbsp60 days D . &nbsp90 days

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

Question

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

Answer: Option D

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