Environment & Ecology · Environmental Engineering
The biological action involved in the anaerobic sludge digestion process occurs in three stages: 1. Acid fermentation2. Alkaline fermentation3. Acid regression What is the correct chronological sequence of these stages?
- 11, 2, 3
- 21, 3, 2✓
- 33, 1, 2
- 42, 3, 1
Correct answer
1, 3, 2
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