Question

Final stage of anaerobic digestion is

• A. Hydrolysis
• B. Acidogenesis
• C. Acetogenesis
• D. Methanogenesis

Hint:

Sequence of anaerobic digestion: \[ \boxed{ \text{Hydrolysis} \rightarrow \text{Acidogenesis} \rightarrow \text{Acetogenesis} \rightarrow \text{Methanogenesis} } \] The final product is mainly \[ \boxed{\text{Methane (CH}_4\text{)}.} \]

Answer 1

The Correct Option is D

Step 1: Recall the stages of anaerobic digestion. Anaerobic digestion proceeds through the following stages: \[ \boxed{ \text{Hydrolysis} \rightarrow \text{Acidogenesis} \rightarrow \text{Acetogenesis} \rightarrow \text{Methanogenesis} } \]

Step 2: Identify the final stage. In the last stage, methanogenic archaea convert acetate, carbon dioxide and hydrogen into methane. Hence, \[ \boxed{\text{Methanogenesis}} \] is the final stage of anaerobic digestion. Therefore, \[ \boxed{(D)} \] is the correct answer.