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Question
Which of the following statements correctly describes the sequential flow of the three microbial stages in anaerobic digestion?
Options
Acidogenesis → Hydrolysis → Methanogenesis
Methanogenesis → Acidogenesis → Hydrolysis
Hydrolysis → Acidogenesis → Methanogenesis
Methanogenesis → Hydrolysis → Acidogenesis
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Solution
Anaerobic digestion occurs in three sequential stages: Stage I (Hydrolysis/Solubilisation) breaks down complex organic polymers into simple monomers; Stage II (Acidogenesis) converts these monomers into organic acids, hydrogen, and carbon dioxide; and Stage III (Methanogenesis) converts the products from Stage II into methane. This strict sequential order is essential because each stage depends on the products of the previous stage, and the microbial communities are distinct and non-interchangeable.
