1.

Which of the following is correct regarding pH in different stages of the sludge digestion process?

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
Answer» D. Acid fermentation < Acid regression > Alkaline fermentation


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