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Question
The different actions that take place in anaerobic decomposition process are
1. Alkaline fermentation
2. Acid fermentation
3. Acid regression
4. Methane formation
What is the correct sequence of these actions (from earlier to later)?
A.
4, 3, 1 and 2
B.
2, 3, 1 and 4
C.
4, 1, 3 and 2
D.
2, 1, 3 and 4
Answer ( Option B)

2, 3, 1 and 4

Solution

The following three stages occur in sludge digestion process:
Acid fermentation → Acid regression → Alkaline fermentation → Methane formation 

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