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

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+1 vote
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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

I had been asked this question in my homework.

I would like to ask this question from Digestion of Sludge, Sludge Digestion Tank topic in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Right answer is (c) Acid fermentation < Acid regression < Alkaline fermentation

For explanation: The pH value in Alkaline fermentation stage is 7.5 whereas in Acid regression and Acid fermentation stage, the pH>7, having the least in acid fermentation stage.

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