Question
a.
Acid fermentation > Acid regression > Alkaline fermentation
b.
Acid regression > Acid fermentation > Alkaline fermentation
c.
Acid fermentation < Acid regression < Alkaline fermentation
d.
Acid fermentation < Acid regression > Alkaline fermentation
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Q. Which of the following is correct regarding pH in different stages of the sludge digestion process?
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