Question

The correct sequence of steps in Bio-gas production is ________.

• A. Hydrolysis \(\rightarrow\) Acidogenesis \(\rightarrow\) Methanogenesis
• B. Acidogenesis \(\rightarrow\) Hydrolysis \(\rightarrow\) Methanogenesis
• C. Solubilization \(\rightarrow\) Methanogenesis \(\rightarrow\) Acidogenesis
• D. Methanogenesis \(\rightarrow\) Acidogenesis \(\rightarrow\) Hydrolysis

Hint:

Complex waste is first broken down, then converted to acids, and finally to methane.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Biogas is produced by anaerobic digestion of organic waste in three stages.

Step 2: Stage 1
Hydrolysis (solubilisation): complex polysaccharides, proteins and fats are broken down to soluble sugars, amino acids and fatty acids.

Step 3: Stage 2 and 3
Acidogenesis converts these to organic acids such as acetic acid. Methanogenesis then converts the acids to methane and carbon dioxide.

Final Answer:
The correct sequence is hydrolysis, acidogenesis and then methanogenesis. \[ \boxed{\text{(A) }\text{Hydrolysis} \rightarrow \text{Acidogenesis} \rightarrow \text{Methanogenesis}} \]